From 3a2c4d55e32ad65efebdb6de44eef3bfa08bb49d Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 2 Sep 2026 15:31:14 -0700 Subject: treewide: refresh kmalloc_obj() conversions This is another run of the Coccinelle script for converting kmalloc() family of allocations to kmalloc_obj() via the existing rules in scripts/coccinelle/api/kmalloc_objs.cocci This catches both the set of kmalloc() uses added since the first kmalloc_obj() conversions in v7.0 and adds a large group missed in the first pass due to Coccinelle not interacting well with the cleanup.h scoped_...() family of macros[1]. I worked around this with spatch's "--macro-file" argument to a file with all the scoped_...() macros mapped to Coccinelle's YACFE_ITERATOR[2] as that was the closest viable control flow indicator I could find. Build tested allmodconfig on x86, arm64, arm, loongarch, mips, powerpc, riscv, and s390 with no new warnings. Link: https://lore.kernel.org/lkml/202609021314.8A9C0B8@keescook/ [1] Link: https://github.com/coccinelle/coccinelle/blob/master/standard.h [2] Signed-off-by: Kees Cook --- tools/perf/builtin-sched.c | 5532 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 5532 insertions(+) create mode 100644 tools/perf/builtin-sched.c (limited to 'tools/perf/builtin-sched.c') diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c new file mode 100644 index 000000000..dd39a4fb6 --- /dev/null +++ b/tools/perf/builtin-sched.c @@ -0,0 +1,5532 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "builtin.h" +#include "perf.h" +#include "perf-sys.h" + +#include "util/cpumap.h" +#include "util/evlist.h" +#include "util/evsel.h" +#include "util/evsel_fprintf.h" +#include "util/mutex.h" +#include "util/symbol.h" +#include "util/thread.h" +#include "util/header.h" +#include "util/session.h" +#include "util/tool.h" +#include "util/cloexec.h" +#include "util/thread_map.h" +#include "util/color.h" +#include "util/stat.h" +#include "util/string2.h" +#include "util/callchain.h" +#include "util/time-utils.h" + +#include +#include +#include "util/trace-event.h" + +#include "util/debug.h" +#include "util/event.h" +#include "util/util.h" +#include "util/synthetic-events.h" +#include "util/target.h" + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define PR_SET_NAME 15 /* Set process name */ +#define MAX_CPUS 4096 +#define COMM_LEN 20 +#define SYM_LEN 129 +#define MAX_PID 1024000 +#define PID_MAX_LIMIT 4194304 /* kernel limit on 64-bit */ +#define MAX_PRIO 140 +#define SEP_LEN 100 + +#define NUM_LAT_BUCKETS 22 + +enum hist_mode { + HIST_MODE_LOG = 0, + HIST_MODE_LINEAR, +}; + +static const char *lat_bucket_names[NUM_LAT_BUCKETS] = { + "< 1 us", + "1 - 2 us", + "2 - 4 us", + "4 - 8 us", + "8 - 16 us", + "16 - 32 us", + "32 - 64 us", + "64 - 128 us", + "128 - 256 us", + "256 - 512 us", + "512 - 1024 us", + "1 - 2 ms", + "2 - 4 ms", + "4 - 8 ms", + "8 - 16 ms", + "16 - 32 ms", + "32 - 64 ms", + "64 - 128 ms", + "128 - 256 ms", + "256 - 512 ms", + "512 - 1024 ms", + ">= 1.05 s" +}; + +static const char *linear_bucket_names[NUM_LAT_BUCKETS] = { + "< 100 us", + "100 - 200 us", + "200 - 300 us", + "300 - 400 us", + "400 - 500 us", + "500 - 600 us", + "600 - 700 us", + "700 - 800 us", + "800 - 900 us", + "900 - 1000 us", + "1.0 - 1.1 ms", + "1.1 - 1.2 ms", + "1.2 - 1.3 ms", + "1.3 - 1.4 ms", + "1.4 - 1.5 ms", + "1.5 - 1.6 ms", + "1.6 - 1.7 ms", + "1.7 - 1.8 ms", + "1.8 - 1.9 ms", + "1.9 - 2.0 ms", + "2.0 - 2.1 ms", + ">= 2.1 ms" +}; + +struct perf_sched; +static int latency_bucket(struct perf_sched *sched, u64 delta_ns); +static void print_latency_histogram(struct perf_sched *sched, u64 *hist, + u64 total_count, const char *title); + +static const char *cpu_list; +static struct perf_cpu_map *user_requested_cpus; +static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS); + +struct sched_atom; + +struct task_desc { + unsigned long nr; + unsigned long pid; + char comm[COMM_LEN]; + + unsigned long nr_events; + unsigned long curr_event; + struct sched_atom **atoms; + + pthread_t thread; + + sem_t ready_for_work; + sem_t work_done_sem; + + u64 cpu_usage; +}; + +enum sched_event_type { + SCHED_EVENT_RUN, + SCHED_EVENT_SLEEP, + SCHED_EVENT_WAKEUP, +}; + +struct sched_atom { + enum sched_event_type type; + u64 timestamp; + u64 duration; + unsigned long nr; + sem_t *wait_sem; + struct task_desc *wakee; +}; + +enum thread_state { + THREAD_SLEEPING = 0, + THREAD_WAIT_CPU, + THREAD_SCHED_IN, + THREAD_IGNORE +}; + +struct work_atom { + struct list_head list; + enum thread_state state; + u64 sched_out_time; + u64 wake_up_time; + u64 sched_in_time; + u64 runtime; +}; + +struct work_atoms { + struct list_head work_list; + struct thread *thread; + struct rb_node node; + u64 max_lat; + u64 max_lat_start; + u64 max_lat_end; + u64 total_lat; + u64 nb_atoms; + u64 total_runtime; + int num_merged; + u64 hist[NUM_LAT_BUCKETS]; +}; + +typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *); + +struct perf_sched; + +struct trace_sched_handler { + int (*switch_event)(struct perf_sched *sched, struct perf_sample *sample, + struct machine *machine); + + int (*runtime_event)(struct perf_sched *sched, struct perf_sample *sample, + struct machine *machine); + + int (*wakeup_event)(struct perf_sched *sched, struct perf_sample *sample, + struct machine *machine); + + /* PERF_RECORD_FORK event, not sched_process_fork tracepoint */ + int (*fork_event)(struct perf_sched *sched, union perf_event *event, + struct machine *machine); + + int (*migrate_task_event)(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine); +}; + +#define COLOR_PIDS PERF_COLOR_BLUE +#define COLOR_CPUS PERF_COLOR_BG_RED + +struct perf_sched_map { + DECLARE_BITMAP(comp_cpus_mask, MAX_CPUS); + struct perf_cpu *comp_cpus; + bool comp; + struct perf_thread_map *color_pids; + const char *color_pids_str; + struct perf_cpu_map *color_cpus; + const char *color_cpus_str; + const char *task_name; + struct strlist *task_names; + bool fuzzy; + struct perf_cpu_map *cpus; + const char *cpus_str; +}; + +struct perf_sched { + struct perf_tool tool; + const char *sort_order; + unsigned long nr_tasks; + struct task_desc **pid_to_task; + struct task_desc **tasks; + const struct trace_sched_handler *tp_handler; + struct mutex start_work_mutex; + struct mutex work_done_wait_mutex; + int profile_cpu; +/* + * Track the current task - that way we can know whether there's any + * weird events, such as a task being switched away that is not current. + */ + struct perf_cpu max_cpu; + u32 *curr_pid; + struct thread **curr_thread; + struct thread **curr_out_thread; + char next_shortname1; + char next_shortname2; + unsigned int replay_repeat; + unsigned long nr_run_events; + unsigned long nr_sleep_events; + unsigned long nr_wakeup_events; + unsigned long nr_sleep_corrections; + unsigned long nr_run_events_optimized; + unsigned long targetless_wakeups; + unsigned long multitarget_wakeups; + unsigned long nr_runs; + unsigned long nr_timestamps; + unsigned long nr_unordered_timestamps; + unsigned long nr_context_switch_bugs; + unsigned long nr_events; + unsigned long nr_lost_chunks; + unsigned long nr_lost_events; + u64 run_measurement_overhead; + u64 sleep_measurement_overhead; + u64 start_time; + u64 cpu_usage; + u64 runavg_cpu_usage; + u64 parent_cpu_usage; + u64 runavg_parent_cpu_usage; + u64 sum_runtime; + u64 sum_fluct; + u64 run_avg; + u64 all_runtime; + u64 all_count; + u64 *cpu_last_switched; + struct rb_root_cached atom_root, sorted_atom_root, merged_atom_root; + struct list_head sort_list, cmp_pid; + bool force; + bool skip_merge; + bool show_histogram; + enum hist_mode hist_mode; + const char *hist_mode_str; + u64 global_hist[NUM_LAT_BUCKETS]; + struct perf_sched_map map; + + /* options for timehist command */ + bool summary; + bool summary_only; + bool idle_hist; + bool show_callchain; + unsigned int max_stack; + bool show_cpu_visual; + bool show_wakeups; + bool show_next; + bool show_migrations; + bool pre_migrations; + bool show_state; + bool show_prio; + u64 skipped_samples; + const char *time_str; + struct perf_time_interval ptime; + struct perf_time_interval hist_time; + volatile bool thread_funcs_exit; + const char *prio_str; + DECLARE_BITMAP(prio_bitmap, MAX_PRIO); + + struct perf_session *session; + struct perf_data *data; +}; + +static int scnprintf_latency_unit(char *buf, size_t size, u64 nsecs) +{ + if (nsecs < 1000) + return scnprintf(buf, size, "%6" PRIu64 " ns", nsecs); + if (nsecs < NSEC_PER_MSEC) + return scnprintf(buf, size, "%6.3f us", (double)nsecs / NSEC_PER_USEC); + if (nsecs < NSEC_PER_SEC) + return scnprintf(buf, size, "%6.3f ms", (double)nsecs / NSEC_PER_MSEC); + return scnprintf(buf, size, "%6.3f s ", (double)nsecs / NSEC_PER_SEC); +} + +static int latency_bucket(struct perf_sched *sched, u64 delta_ns) +{ + u64 delta_us = delta_ns / NSEC_PER_USEC; + u64 b; + + if (sched->hist_mode == HIST_MODE_LINEAR) { + b = delta_us / 100; + } else { + if (delta_us == 0) + return 0; + b = 64 - __builtin_clzll(delta_us); + } + + if (b >= NUM_LAT_BUCKETS - 1) + return NUM_LAT_BUCKETS - 1; + return b; +} + +static void print_latency_histogram(struct perf_sched *sched, u64 *hist, + u64 total_count, const char *title) +{ + const char **bucket_names = (sched->hist_mode == HIST_MODE_LINEAR) ? + linear_bucket_names : lat_bucket_names; + int bar_total = 40; + char bar[] = "########################################"; + int i; + + if (total_count == 0) + return; + + printf("\n %s (total samples: %" PRIu64 ")\n", title, total_count); + printf(" -------------------------------------------------------------------\n"); + printf(" %-16s | %10s | %6s | %s\n", + "Latency Range", "Count", "Pct", "Histogram Graph"); + printf(" -------------------------------------------------------------------\n"); + + for (i = 0; i < NUM_LAT_BUCKETS; i++) { + double pct; + int bar_len; + + if (hist[i] == 0) + continue; + pct = (double)hist[i] * 100.0 / total_count; + bar_len = (hist[i] * bar_total) / total_count; + if (bar_len == 0 && hist[i] > 0) + bar_len = 1; + printf(" %-16s | %10" PRIu64 " | %5.1f%% | %.*s\n", + bucket_names[i], hist[i], pct, + bar_len, bar); + } + printf(" -------------------------------------------------------------------\n"); +} + +/* per thread run time data */ +struct thread_runtime { + u64 last_time; /* time of previous sched in/out event */ + u64 dt_run; /* run time */ + u64 dt_sleep; /* time between CPU access by sleep (off cpu) */ + u64 dt_iowait; /* time between CPU access by iowait (off cpu) */ + u64 dt_preempt; /* time between CPU access by preempt (off cpu) */ + u64 dt_delay; /* time between wakeup and sched-in */ + u64 dt_pre_mig; /* time between migration and wakeup */ + u64 ready_to_run; /* time of wakeup */ + u64 migrated; /* time when a thread is migrated */ + + struct stats run_stats; + u64 total_run_time; + u64 total_sleep_time; + u64 total_iowait_time; + u64 total_preempt_time; + u64 total_delay_time; + u64 total_pre_mig_time; + + char last_state; + + char shortname[3]; + bool comm_changed; + + u64 migrations; + + int prio; + bool color; +}; + +/* per event run time data */ +struct evsel_runtime { + u64 *last_time; /* time this event was last seen per cpu */ + u32 ncpu; /* highest cpu slot allocated */ +}; + +/* per cpu idle time data */ +struct idle_thread_runtime { + struct thread_runtime tr; + struct thread *last_thread; + struct rb_root_cached sorted_root; + struct callchain_root callchain; + struct callchain_cursor cursor; +}; + +/* track idle times per cpu */ +static struct thread **idle_threads; +static int idle_max_cpu; +static char idle_comm[] = ""; + +static u64 get_nsecs(void) +{ + struct timespec ts; + + clock_gettime(CLOCK_MONOTONIC, &ts); + + return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec; +} + +static void burn_nsecs(struct perf_sched *sched, u64 nsecs) +{ + u64 T0 = get_nsecs(), T1; + + do { + T1 = get_nsecs(); + } while (T1 + sched->run_measurement_overhead < T0 + nsecs); +} + +static void sleep_nsecs(u64 nsecs) +{ + struct timespec ts; + + ts.tv_nsec = nsecs % 999999999; + ts.tv_sec = nsecs / 999999999; + + nanosleep(&ts, NULL); +} + +static void calibrate_run_measurement_overhead(struct perf_sched *sched) +{ + u64 T0, T1, delta, min_delta = NSEC_PER_SEC; + int i; + + for (i = 0; i < 10; i++) { + T0 = get_nsecs(); + burn_nsecs(sched, 0); + T1 = get_nsecs(); + delta = T1-T0; + min_delta = min(min_delta, delta); + } + sched->run_measurement_overhead = min_delta; + + printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta); +} + +static void calibrate_sleep_measurement_overhead(struct perf_sched *sched) +{ + u64 T0, T1, delta, min_delta = NSEC_PER_SEC; + int i; + + for (i = 0; i < 10; i++) { + T0 = get_nsecs(); + sleep_nsecs(10000); + T1 = get_nsecs(); + delta = T1-T0; + min_delta = min(min_delta, delta); + } + min_delta -= 10000; + sched->sleep_measurement_overhead = min_delta; + + printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta); +} + +static struct sched_atom * +get_new_event(struct task_desc *task, u64 timestamp) +{ + struct sched_atom *event = zalloc(sizeof(*event)); + unsigned long idx = task->nr_events; + size_t size; + struct sched_atom **atoms_p; + + if (event == NULL) { + pr_err("ERROR: sched: failed to allocate event\n"); + return NULL; + } + + event->timestamp = timestamp; + event->nr = idx; + + size = sizeof(struct sched_atom *) * (task->nr_events + 1); + atoms_p = realloc(task->atoms, size); + if (!atoms_p) { + pr_err("ERROR: sched: failed to grow atoms array\n"); + free(event); + return NULL; + } + task->atoms = atoms_p; + task->nr_events++; + + task->atoms[idx] = event; + + return event; +} + +static struct sched_atom *last_event(struct task_desc *task) +{ + if (!task->nr_events) + return NULL; + + return task->atoms[task->nr_events - 1]; +} + +static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task, + u64 timestamp, u64 duration) +{ + struct sched_atom *event, *curr_event = last_event(task); + + /* + * optimize an existing RUN event by merging this one + * to it: + */ + if (curr_event && curr_event->type == SCHED_EVENT_RUN) { + sched->nr_run_events_optimized++; + curr_event->duration += duration; + return; + } + + event = get_new_event(task, timestamp); + if (event == NULL) + return; + + event->type = SCHED_EVENT_RUN; + event->duration = duration; + + sched->nr_run_events++; +} + +static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task, + u64 timestamp, struct task_desc *wakee) +{ + struct sched_atom *event, *wakee_event; + + event = get_new_event(task, timestamp); + if (event == NULL) + return; + event->type = SCHED_EVENT_WAKEUP; + event->wakee = wakee; + + wakee_event = last_event(wakee); + if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) { + sched->targetless_wakeups++; + return; + } + if (wakee_event->wait_sem) { + sched->multitarget_wakeups++; + return; + } + + wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem)); + if (!wakee_event->wait_sem) { + pr_err("ERROR: sched: failed to allocate semaphore\n"); + return; + } + sem_init(wakee_event->wait_sem, 0, 0); + event->wait_sem = wakee_event->wait_sem; + + sched->nr_wakeup_events++; +} + +static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task, + u64 timestamp) +{ + struct sched_atom *event = get_new_event(task, timestamp); + + if (event == NULL) + return; + + event->type = SCHED_EVENT_SLEEP; + + sched->nr_sleep_events++; +} + +static struct task_desc *register_pid(struct perf_sched *sched, + unsigned long pid, const char *comm) +{ + struct task_desc *task, **tasks_p; + static int pid_max; + + /* perf.data is untrusted — cap pid to prevent overflow in size calculations */ + if (pid >= PID_MAX_LIMIT) { + pr_err("pid %lu exceeds limit %d, skipping\n", pid, PID_MAX_LIMIT); + return NULL; + } + + if (sched->pid_to_task == NULL) { + if (sysctl__read_int("kernel/pid_max", &pid_max) < 0) + pid_max = MAX_PID; + sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *)); + if (sched->pid_to_task == NULL) + return NULL; + } + if (pid >= (unsigned long)pid_max) { + void *p = realloc(sched->pid_to_task, (pid + 1) * sizeof(struct task_desc *)); + + if (p == NULL) + return NULL; + sched->pid_to_task = p; + while (pid >= (unsigned long)pid_max) + sched->pid_to_task[pid_max++] = NULL; + } + + task = sched->pid_to_task[pid]; + + if (task) + return task; + + task = zalloc(sizeof(*task)); + if (task == NULL) + return NULL; + task->pid = pid; + if (comm) + strlcpy(task->comm, comm, sizeof(task->comm)); + /* + * every task starts in sleeping state - this gets ignored + * if there's no wakeup pointing to this sleep state: + */ + add_sched_event_sleep(sched, task, 0); + + sched->pid_to_task[pid] = task; + tasks_p = realloc(sched->tasks, (sched->nr_tasks + 1) * sizeof(struct task_desc *)); + if (!tasks_p) + return NULL; + sched->tasks = tasks_p; + sched->tasks[sched->nr_tasks] = task; + task->nr = sched->nr_tasks++; + + if (verbose > 0) + printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm); + + return task; +} + + +static void print_task_traces(struct perf_sched *sched) +{ + struct task_desc *task; + unsigned long i; + + for (i = 0; i < sched->nr_tasks; i++) { + task = sched->tasks[i]; + printf("task %6ld (%20s:%10ld), nr_events: %ld\n", + task->nr, task->comm, task->pid, task->nr_events); + } +} + +static void add_cross_task_wakeups(struct perf_sched *sched) +{ + struct task_desc *task1, *task2; + unsigned long i, j; + + for (i = 0; i < sched->nr_tasks; i++) { + task1 = sched->tasks[i]; + j = i + 1; + if (j == sched->nr_tasks) + j = 0; + task2 = sched->tasks[j]; + add_sched_event_wakeup(sched, task1, 0, task2); + } +} + +static void perf_sched__process_event(struct perf_sched *sched, + struct sched_atom *atom) +{ + int ret = 0; + + switch (atom->type) { + case SCHED_EVENT_RUN: + burn_nsecs(sched, atom->duration); + break; + case SCHED_EVENT_SLEEP: + if (atom->wait_sem) + ret = sem_wait(atom->wait_sem); + BUG_ON(ret); + break; + case SCHED_EVENT_WAKEUP: + if (atom->wait_sem) + ret = sem_post(atom->wait_sem); + BUG_ON(ret); + break; + default: + BUG_ON(1); + } +} + +static u64 get_cpu_usage_nsec_parent(void) +{ + struct rusage ru; + u64 sum; + int err; + + err = getrusage(RUSAGE_SELF, &ru); + BUG_ON(err); + + sum = ru.ru_utime.tv_sec * NSEC_PER_SEC + ru.ru_utime.tv_usec * NSEC_PER_USEC; + sum += ru.ru_stime.tv_sec * NSEC_PER_SEC + ru.ru_stime.tv_usec * NSEC_PER_USEC; + + return sum; +} + +static int self_open_counters(struct perf_sched *sched, unsigned long cur_task) +{ + struct perf_event_attr attr; + char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE]; + int fd; + struct rlimit limit; + bool need_privilege = false; + + memset(&attr, 0, sizeof(attr)); + + attr.type = PERF_TYPE_SOFTWARE; + attr.config = PERF_COUNT_SW_TASK_CLOCK; + +force_again: + fd = sys_perf_event_open(&attr, 0, -1, -1, + perf_event_open_cloexec_flag()); + + if (fd < 0) { + if (errno == EMFILE) { + if (sched->force) { + BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1); + limit.rlim_cur += sched->nr_tasks - cur_task; + if (limit.rlim_cur > limit.rlim_max) { + limit.rlim_max = limit.rlim_cur; + need_privilege = true; + } + if (setrlimit(RLIMIT_NOFILE, &limit) == -1) { + if (need_privilege && errno == EPERM) + strcpy(info, "Need privilege\n"); + } else + goto force_again; + } else + strcpy(info, "Have a try with -f option\n"); + } + pr_err("Error: sys_perf_event_open() syscall returned " + "with %d (%s)\n%s", fd, + str_error_r(errno, sbuf, sizeof(sbuf)), info); + exit(EXIT_FAILURE); + } + return fd; +} + +static u64 get_cpu_usage_nsec_self(int fd) +{ + u64 runtime; + int ret; + + ret = read(fd, &runtime, sizeof(runtime)); + BUG_ON(ret != sizeof(runtime)); + + return runtime; +} + +struct sched_thread_parms { + struct task_desc *task; + struct perf_sched *sched; + int fd; +}; + +static void *thread_func(void *ctx) +{ + struct sched_thread_parms *parms = ctx; + struct task_desc *this_task = parms->task; + struct perf_sched *sched = parms->sched; + u64 cpu_usage_0, cpu_usage_1; + unsigned long i, ret; + char comm2[22]; + int fd = parms->fd; + + zfree(&parms); + + sprintf(comm2, ":%s", this_task->comm); + prctl(PR_SET_NAME, comm2); + if (fd < 0) + return NULL; + + while (!sched->thread_funcs_exit) { + ret = sem_post(&this_task->ready_for_work); + BUG_ON(ret); + mutex_lock(&sched->start_work_mutex); + mutex_unlock(&sched->start_work_mutex); + + cpu_usage_0 = get_cpu_usage_nsec_self(fd); + + for (i = 0; i < this_task->nr_events; i++) { + this_task->curr_event = i; + perf_sched__process_event(sched, this_task->atoms[i]); + } + + cpu_usage_1 = get_cpu_usage_nsec_self(fd); + this_task->cpu_usage = cpu_usage_1 - cpu_usage_0; + ret = sem_post(&this_task->work_done_sem); + BUG_ON(ret); + + mutex_lock(&sched->work_done_wait_mutex); + mutex_unlock(&sched->work_done_wait_mutex); + } + return NULL; +} + +static void create_tasks(struct perf_sched *sched) + EXCLUSIVE_LOCK_FUNCTION(sched->start_work_mutex) + EXCLUSIVE_LOCK_FUNCTION(sched->work_done_wait_mutex) +{ + struct task_desc *task; + pthread_attr_t attr; + unsigned long i; + int err; + + err = pthread_attr_init(&attr); + BUG_ON(err); + err = pthread_attr_setstacksize(&attr, + (size_t) max(16 * 1024, (int)PTHREAD_STACK_MIN)); + BUG_ON(err); + mutex_lock(&sched->start_work_mutex); + mutex_lock(&sched->work_done_wait_mutex); + for (i = 0; i < sched->nr_tasks; i++) { + struct sched_thread_parms *parms = malloc(sizeof(*parms)); + BUG_ON(parms == NULL); + parms->task = task = sched->tasks[i]; + parms->sched = sched; + parms->fd = self_open_counters(sched, i); + sem_init(&task->ready_for_work, 0, 0); + sem_init(&task->work_done_sem, 0, 0); + task->curr_event = 0; + err = pthread_create(&task->thread, &attr, thread_func, parms); + BUG_ON(err); + } +} + +static void destroy_tasks(struct perf_sched *sched) + UNLOCK_FUNCTION(sched->start_work_mutex) + UNLOCK_FUNCTION(sched->work_done_wait_mutex) +{ + struct task_desc *task; + unsigned long i; + int err; + + mutex_unlock(&sched->start_work_mutex); + mutex_unlock(&sched->work_done_wait_mutex); + /* Get rid of threads so they won't be upset by mutex destrunction */ + for (i = 0; i < sched->nr_tasks; i++) { + task = sched->tasks[i]; + err = pthread_join(task->thread, NULL); + BUG_ON(err); + sem_destroy(&task->ready_for_work); + sem_destroy(&task->work_done_sem); + } +} + +static void wait_for_tasks(struct perf_sched *sched) + EXCLUSIVE_LOCKS_REQUIRED(sched->work_done_wait_mutex) + EXCLUSIVE_LOCKS_REQUIRED(sched->start_work_mutex) +{ + u64 cpu_usage_0, cpu_usage_1; + struct task_desc *task; + unsigned long i, ret; + + sched->start_time = get_nsecs(); + sched->cpu_usage = 0; + mutex_unlock(&sched->work_done_wait_mutex); + + for (i = 0; i < sched->nr_tasks; i++) { + task = sched->tasks[i]; + ret = sem_wait(&task->ready_for_work); + BUG_ON(ret); + sem_init(&task->ready_for_work, 0, 0); + } + mutex_lock(&sched->work_done_wait_mutex); + + cpu_usage_0 = get_cpu_usage_nsec_parent(); + + mutex_unlock(&sched->start_work_mutex); + + for (i = 0; i < sched->nr_tasks; i++) { + task = sched->tasks[i]; + ret = sem_wait(&task->work_done_sem); + BUG_ON(ret); + sem_init(&task->work_done_sem, 0, 0); + sched->cpu_usage += task->cpu_usage; + task->cpu_usage = 0; + } + + cpu_usage_1 = get_cpu_usage_nsec_parent(); + if (!sched->runavg_cpu_usage) + sched->runavg_cpu_usage = sched->cpu_usage; + sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat; + + sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0; + if (!sched->runavg_parent_cpu_usage) + sched->runavg_parent_cpu_usage = sched->parent_cpu_usage; + sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) + + sched->parent_cpu_usage)/sched->replay_repeat; + + mutex_lock(&sched->start_work_mutex); + + for (i = 0; i < sched->nr_tasks; i++) { + task = sched->tasks[i]; + task->curr_event = 0; + } +} + +static void run_one_test(struct perf_sched *sched) + EXCLUSIVE_LOCKS_REQUIRED(sched->work_done_wait_mutex) + EXCLUSIVE_LOCKS_REQUIRED(sched->start_work_mutex) +{ + u64 T0, T1, delta, avg_delta, fluct; + + T0 = get_nsecs(); + wait_for_tasks(sched); + T1 = get_nsecs(); + + delta = T1 - T0; + sched->sum_runtime += delta; + sched->nr_runs++; + + avg_delta = sched->sum_runtime / sched->nr_runs; + if (delta < avg_delta) + fluct = avg_delta - delta; + else + fluct = delta - avg_delta; + sched->sum_fluct += fluct; + if (!sched->run_avg) + sched->run_avg = delta; + sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat; + + printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / NSEC_PER_MSEC); + + printf("ravg: %0.2f, ", (double)sched->run_avg / NSEC_PER_MSEC); + + printf("cpu: %0.2f / %0.2f", + (double)sched->cpu_usage / NSEC_PER_MSEC, (double)sched->runavg_cpu_usage / NSEC_PER_MSEC); + +#if 0 + /* + * rusage statistics done by the parent, these are less + * accurate than the sched->sum_exec_runtime based statistics: + */ + printf(" [%0.2f / %0.2f]", + (double)sched->parent_cpu_usage / NSEC_PER_MSEC, + (double)sched->runavg_parent_cpu_usage / NSEC_PER_MSEC); +#endif + + printf("\n"); + + if (sched->nr_sleep_corrections) + printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections); + sched->nr_sleep_corrections = 0; +} + +static void test_calibrations(struct perf_sched *sched) +{ + u64 T0, T1; + + T0 = get_nsecs(); + burn_nsecs(sched, NSEC_PER_MSEC); + T1 = get_nsecs(); + + printf("the run test took %" PRIu64 " nsecs\n", T1 - T0); + + T0 = get_nsecs(); + sleep_nsecs(NSEC_PER_MSEC); + T1 = get_nsecs(); + + printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0); +} + +static int +replay_wakeup_event(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine __maybe_unused) +{ + const char *comm = perf_sample__strval(sample, "comm"); + const u32 pid = perf_sample__intval(sample, "pid"); + struct task_desc *waker, *wakee; + + if (verbose > 0) { + printf("sched_wakeup event %p\n", sample->evsel); + + printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid); + } + + waker = register_pid(sched, sample->tid, ""); + wakee = register_pid(sched, pid, comm); + if (waker == NULL || wakee == NULL) + return -1; + + add_sched_event_wakeup(sched, waker, sample->time, wakee); + return 0; +} + +static int replay_switch_event(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine __maybe_unused) +{ + const char *prev_comm = perf_sample__strval(sample, "prev_comm"), + *next_comm = perf_sample__strval(sample, "next_comm"); + const u32 prev_pid = perf_sample__intval(sample, "prev_pid"), + next_pid = perf_sample__intval(sample, "next_pid"); + struct task_desc *prev, __maybe_unused *next; + u64 timestamp0, timestamp = sample->time; + int cpu = sample->cpu; + s64 delta; + + if (verbose > 0) + printf("sched_switch event %p\n", sample->evsel); + + if (cpu >= MAX_CPUS || cpu < 0) + return 0; + + timestamp0 = sched->cpu_last_switched[cpu]; + if (timestamp0) + delta = timestamp - timestamp0; + else + delta = 0; + + if (delta < 0) { + pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta); + return -1; + } + + pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n", + prev_comm, prev_pid, next_comm, next_pid, delta); + + prev = register_pid(sched, prev_pid, prev_comm); + next = register_pid(sched, next_pid, next_comm); + if (prev == NULL || next == NULL) + return -1; + + sched->cpu_last_switched[cpu] = timestamp; + + add_sched_event_run(sched, prev, timestamp, delta); + add_sched_event_sleep(sched, prev, timestamp); + + return 0; +} + +static int replay_fork_event(struct perf_sched *sched, + union perf_event *event, + struct machine *machine) +{ + struct thread *child, *parent; + + child = machine__findnew_thread(machine, event->fork.pid, + event->fork.tid); + parent = machine__findnew_thread(machine, event->fork.ppid, + event->fork.ptid); + + if (child == NULL || parent == NULL) { + pr_debug("thread does not exist on fork event: child %p, parent %p\n", + child, parent); + goto out_put; + } + + if (verbose > 0) { + printf("fork event\n"); + printf("... parent: %s/%d\n", thread__comm_str(parent), thread__tid(parent)); + printf("... child: %s/%d\n", thread__comm_str(child), thread__tid(child)); + } + + register_pid(sched, thread__tid(parent), thread__comm_str(parent)); + register_pid(sched, thread__tid(child), thread__comm_str(child)); +out_put: + thread__put(child); + thread__put(parent); + return 0; +} + +struct sort_dimension { + const char *name; + sort_fn_t cmp; + struct list_head list; +}; + +static inline void init_prio(struct thread_runtime *r) +{ + r->prio = -1; +} + +/* + * handle runtime stats saved per thread + */ +static struct thread_runtime *thread__init_runtime(struct thread *thread) +{ + struct thread_runtime *r; + + r = zalloc(sizeof(struct thread_runtime)); + if (!r) + return NULL; + + init_stats(&r->run_stats); + init_prio(r); + thread__set_priv(thread, r); + + return r; +} + +static struct thread_runtime *thread__get_runtime(struct thread *thread) +{ + struct thread_runtime *tr; + + tr = thread__priv(thread); + if (tr == NULL) { + tr = thread__init_runtime(thread); + if (tr == NULL) + pr_debug("Failed to malloc memory for runtime data.\n"); + } + + return tr; +} + +static int +thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r) +{ + struct sort_dimension *sort; + int ret = 0; + + BUG_ON(list_empty(list)); + + list_for_each_entry(sort, list, list) { + ret = sort->cmp(l, r); + if (ret) + return ret; + } + + return ret; +} + +static struct work_atoms * +thread_atoms_search(struct rb_root_cached *root, struct thread *thread, + struct list_head *sort_list) +{ + struct rb_node *node = root->rb_root.rb_node; + struct work_atoms key = { .thread = thread }; + + while (node) { + struct work_atoms *atoms; + int cmp; + + atoms = container_of(node, struct work_atoms, node); + + cmp = thread_lat_cmp(sort_list, &key, atoms); + if (cmp > 0) + node = node->rb_left; + else if (cmp < 0) + node = node->rb_right; + else { + BUG_ON(!RC_CHK_EQUAL(thread, atoms->thread)); + return atoms; + } + } + return NULL; +} + +static void +__thread_latency_insert(struct rb_root_cached *root, struct work_atoms *data, + struct list_head *sort_list) +{ + struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL; + bool leftmost = true; + + while (*new) { + struct work_atoms *this; + int cmp; + + this = container_of(*new, struct work_atoms, node); + parent = *new; + + cmp = thread_lat_cmp(sort_list, data, this); + + if (cmp > 0) + new = &((*new)->rb_left); + else { + new = &((*new)->rb_right); + leftmost = false; + } + } + + rb_link_node(&data->node, parent, new); + rb_insert_color_cached(&data->node, root, leftmost); +} + +static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread) +{ + struct work_atoms *atoms = zalloc(sizeof(*atoms)); + if (!atoms) { + pr_err("No memory at %s\n", __func__); + return -1; + } + + atoms->thread = thread__get(thread); + INIT_LIST_HEAD(&atoms->work_list); + __thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid); + return 0; +} + +static int +add_sched_out_event(struct work_atoms *atoms, + char run_state, + u64 timestamp) +{ + struct work_atom *atom = NULL; + + if (!list_empty(&atoms->work_list)) { + atom = list_entry(atoms->work_list.prev, struct work_atom, list); + if (atom->state != THREAD_SCHED_IN) + goto reuse; + } + + atom = zalloc(sizeof(*atom)); + if (!atom) { + pr_err("Non memory at %s", __func__); + return -1; + } + + list_add_tail(&atom->list, &atoms->work_list); + +reuse: + atom->sched_out_time = timestamp; + + if (run_state == 'R') { + atom->state = THREAD_WAIT_CPU; + atom->wake_up_time = atom->sched_out_time; + } else { + atom->state = THREAD_SLEEPING; + atom->wake_up_time = 0; + } + + return 0; +} + +static void +add_runtime_event(struct work_atoms *atoms, u64 delta, + u64 timestamp __maybe_unused) +{ + struct work_atom *atom; + + BUG_ON(list_empty(&atoms->work_list)); + + atom = list_entry(atoms->work_list.prev, struct work_atom, list); + + atom->runtime += delta; + atoms->total_runtime += delta; +} + +static void +add_sched_in_event(struct perf_sched *sched, struct work_atoms *atoms, + u64 timestamp) +{ + struct work_atom *atom; + u64 delta; + int b; + + if (list_empty(&atoms->work_list)) + return; + + atom = list_entry(atoms->work_list.prev, struct work_atom, list); + + if (atom->state != THREAD_WAIT_CPU) + return; + + if (timestamp < atom->wake_up_time) { + atom->state = THREAD_IGNORE; + return; + } + + if (perf_time__skip_sample(&sched->ptime, timestamp)) + return; + + atom->state = THREAD_SCHED_IN; + atom->sched_in_time = timestamp; + + delta = atom->sched_in_time - atom->wake_up_time; + atoms->total_lat += delta; + if (delta > atoms->max_lat) { + atoms->max_lat = delta; + atoms->max_lat_start = atom->wake_up_time; + atoms->max_lat_end = timestamp; + } + + atoms->nb_atoms++; + + b = latency_bucket(sched, delta); + atoms->hist[b]++; + if (thread__tid(atoms->thread) != 0) + sched->global_hist[b]++; +} + +static void free_work_atoms(struct work_atoms *atoms) +{ + struct work_atom *atom, *tmp; + + if (atoms == NULL) + return; + + list_for_each_entry_safe(atom, tmp, &atoms->work_list, list) { + list_del(&atom->list); + free(atom); + } + thread__zput(atoms->thread); + free(atoms); +} + +static int latency_switch_event(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine) +{ + const u32 prev_pid = perf_sample__intval(sample, "prev_pid"), + next_pid = perf_sample__intval(sample, "next_pid"); + const char prev_state = perf_sample__taskstate(sample, "prev_state"); + struct work_atoms *out_events, *in_events; + struct thread *sched_out, *sched_in; + u64 timestamp0, timestamp = sample->time; + int cpu = sample->cpu, err = -1; + s64 delta; + + /* perf.data is untrusted input — CPU may be absent or corrupted */ + if (cpu >= MAX_CPUS || cpu < 0) { + pr_warning("WARNING: at offset %#" PRIx64 ": out-of-bound sample CPU %d, skipping sample\n", + sample->file_offset, cpu); + return 0; + } + + timestamp0 = sched->cpu_last_switched[cpu]; + sched->cpu_last_switched[cpu] = timestamp; + if (timestamp0) + delta = timestamp - timestamp0; + else + delta = 0; + + if (delta < 0) { + pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta); + return -1; + } + + sched_out = machine__findnew_thread(machine, -1, prev_pid); + sched_in = machine__findnew_thread(machine, -1, next_pid); + if (sched_out == NULL || sched_in == NULL) + goto out_put; + + out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid); + if (!out_events) { + if (thread_atoms_insert(sched, sched_out)) + goto out_put; + out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid); + if (!out_events) { + pr_err("out-event: Internal tree error"); + goto out_put; + } + } + if (add_sched_out_event(out_events, prev_state, timestamp)) + goto out_put; + + in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid); + if (!in_events) { + if (thread_atoms_insert(sched, sched_in)) + goto out_put; + in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid); + if (!in_events) { + pr_err("in-event: Internal tree error"); + goto out_put; + } + /* + * Take came in we have not heard about yet, + * add in an initial atom in runnable state: + */ + if (add_sched_out_event(in_events, 'R', timestamp)) + goto out_put; + } + add_sched_in_event(sched, in_events, timestamp); + err = 0; +out_put: + thread__put(sched_out); + thread__put(sched_in); + return err; +} + +static int latency_runtime_event(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine) +{ + const u32 pid = perf_sample__intval(sample, "pid"); + const u64 runtime = perf_sample__intval(sample, "runtime"); + struct thread *thread; + struct work_atoms *atoms; + u64 timestamp = sample->time; + int cpu = sample->cpu, err = -1; + + if (perf_time__skip_sample(&sched->ptime, timestamp)) + return 0; + + thread = machine__findnew_thread(machine, -1, pid); + if (thread == NULL) + return -1; + + atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid); + + /* perf.data is untrusted input — CPU may be absent or corrupted */ + if (cpu >= MAX_CPUS || cpu < 0) { + pr_warning("WARNING: at offset %#" PRIx64 ": out-of-bound sample CPU %d, skipping sample\n", + sample->file_offset, cpu); + err = 0; + goto out_put; + } + if (!atoms) { + if (thread_atoms_insert(sched, thread)) + goto out_put; + atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid); + if (!atoms) { + pr_err("in-event: Internal tree error"); + goto out_put; + } + if (add_sched_out_event(atoms, 'R', timestamp)) + goto out_put; + } + + add_runtime_event(atoms, runtime, timestamp); + err = 0; +out_put: + thread__put(thread); + return err; +} + +static int latency_wakeup_event(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine) +{ + const u32 pid = perf_sample__intval(sample, "pid"); + struct work_atoms *atoms; + struct work_atom *atom; + struct thread *wakee; + u64 timestamp = sample->time; + int err = -1; + + wakee = machine__findnew_thread(machine, -1, pid); + if (wakee == NULL) + return -1; + atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid); + if (!atoms) { + if (thread_atoms_insert(sched, wakee)) + goto out_put; + atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid); + if (!atoms) { + pr_err("wakeup-event: Internal tree error"); + goto out_put; + } + if (add_sched_out_event(atoms, 'S', timestamp)) + goto out_put; + } + + BUG_ON(list_empty(&atoms->work_list)); + + atom = list_entry(atoms->work_list.prev, struct work_atom, list); + + /* + * As we do not guarantee the wakeup event happens when + * task is out of run queue, also may happen when task is + * on run queue and wakeup only change ->state to TASK_RUNNING, + * then we should not set the ->wake_up_time when wake up a + * task which is on run queue. + * + * You WILL be missing events if you've recorded only + * one CPU, or are only looking at only one, so don't + * skip in this case. + */ + if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING) + goto out_ok; + + sched->nr_timestamps++; + if (atom->sched_out_time > timestamp) { + sched->nr_unordered_timestamps++; + goto out_ok; + } + + atom->state = THREAD_WAIT_CPU; + atom->wake_up_time = timestamp; +out_ok: + err = 0; +out_put: + thread__put(wakee); + return err; +} + +static int latency_migrate_task_event(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine) +{ + const u32 pid = perf_sample__intval(sample, "pid"); + u64 timestamp = sample->time; + struct work_atoms *atoms; + struct work_atom *atom; + struct thread *migrant; + int err = -1; + + /* + * Only need to worry about migration when profiling one CPU. + */ + if (sched->profile_cpu == -1) + return 0; + + migrant = machine__findnew_thread(machine, -1, pid); + if (migrant == NULL) + return -1; + atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid); + if (!atoms) { + if (thread_atoms_insert(sched, migrant)) + goto out_put; + register_pid(sched, thread__tid(migrant), thread__comm_str(migrant)); + atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid); + if (!atoms) { + pr_err("migration-event: Internal tree error"); + goto out_put; + } + if (add_sched_out_event(atoms, 'R', timestamp)) + goto out_put; + } + + BUG_ON(list_empty(&atoms->work_list)); + + atom = list_entry(atoms->work_list.prev, struct work_atom, list); + atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp; + + sched->nr_timestamps++; + + if (atom->sched_out_time > timestamp) + sched->nr_unordered_timestamps++; + err = 0; +out_put: + thread__put(migrant); + return err; +} + +static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list) +{ + int i; + int ret; + u64 avg; + char runtime_lat[32]; + char avg_lat[32], max_lat[32]; + char max_lat_start[32], max_lat_end[32]; + + if (!work_list->nb_atoms) + return; + /* + * Ignore idle threads: + */ + if (thread__tid(work_list->thread) == 0) + return; + + sched->all_runtime += work_list->total_runtime; + sched->all_count += work_list->nb_atoms; + + if (work_list->num_merged > 1) { + ret = printf(" %s:(%d)", thread__comm_str(work_list->thread), + work_list->num_merged); + } else { + ret = printf(" %s:%d", thread__comm_str(work_list->thread), + thread__tid(work_list->thread)); + } + + for (i = 0; i < 24 - ret; i++) + printf(" "); + + avg = work_list->total_lat / work_list->nb_atoms; + scnprintf_latency_unit(runtime_lat, sizeof(runtime_lat), work_list->total_runtime); + scnprintf_latency_unit(avg_lat, sizeof(avg_lat), avg); + scnprintf_latency_unit(max_lat, sizeof(max_lat), work_list->max_lat); + timestamp__scnprintf_usec(work_list->max_lat_start, max_lat_start, sizeof(max_lat_start)); + timestamp__scnprintf_usec(work_list->max_lat_end, max_lat_end, sizeof(max_lat_end)); + + printf(" |%15s |%9" PRIu64 " |%16s |%16s |%20s s |%20s s |\n", + runtime_lat, + work_list->nb_atoms, avg_lat, max_lat, + max_lat_start, max_lat_end); + + if (sched->show_histogram && verbose > 0) + print_latency_histogram(sched, work_list->hist, + work_list->nb_atoms, + "Task Latency Histogram"); +} + +static int pid_cmp(struct work_atoms *l, struct work_atoms *r) +{ + pid_t l_tid, r_tid; + + if (RC_CHK_EQUAL(l->thread, r->thread)) + return 0; + l_tid = thread__tid(l->thread); + r_tid = thread__tid(r->thread); + if (l_tid < r_tid) + return -1; + if (l_tid > r_tid) + return 1; + return (int)(RC_CHK_ACCESS(l->thread) - RC_CHK_ACCESS(r->thread)); +} + +static int avg_cmp(struct work_atoms *l, struct work_atoms *r) +{ + u64 avgl, avgr; + + if (!l->nb_atoms) + return -1; + + if (!r->nb_atoms) + return 1; + + avgl = l->total_lat / l->nb_atoms; + avgr = r->total_lat / r->nb_atoms; + + if (avgl < avgr) + return -1; + if (avgl > avgr) + return 1; + + return 0; +} + +static int max_cmp(struct work_atoms *l, struct work_atoms *r) +{ + if (l->max_lat < r->max_lat) + return -1; + if (l->max_lat > r->max_lat) + return 1; + + return 0; +} + +static int switch_cmp(struct work_atoms *l, struct work_atoms *r) +{ + if (l->nb_atoms < r->nb_atoms) + return -1; + if (l->nb_atoms > r->nb_atoms) + return 1; + + return 0; +} + +static int runtime_cmp(struct work_atoms *l, struct work_atoms *r) +{ + if (l->total_runtime < r->total_runtime) + return -1; + if (l->total_runtime > r->total_runtime) + return 1; + + return 0; +} + +static int sort_dimension__add(const char *tok, struct list_head *list) +{ + size_t i; + static struct sort_dimension avg_sort_dimension = { + .name = "avg", + .cmp = avg_cmp, + }; + static struct sort_dimension max_sort_dimension = { + .name = "max", + .cmp = max_cmp, + }; + static struct sort_dimension pid_sort_dimension = { + .name = "pid", + .cmp = pid_cmp, + }; + static struct sort_dimension runtime_sort_dimension = { + .name = "runtime", + .cmp = runtime_cmp, + }; + static struct sort_dimension switch_sort_dimension = { + .name = "switch", + .cmp = switch_cmp, + }; + struct sort_dimension *available_sorts[] = { + &pid_sort_dimension, + &avg_sort_dimension, + &max_sort_dimension, + &switch_sort_dimension, + &runtime_sort_dimension, + }; + + for (i = 0; i < ARRAY_SIZE(available_sorts); i++) { + if (!strcmp(available_sorts[i]->name, tok)) { + list_add_tail(&available_sorts[i]->list, list); + + return 0; + } + } + + return -1; +} + +static void perf_sched__sort_lat(struct perf_sched *sched) +{ + struct rb_node *node; + struct rb_root_cached *root = &sched->atom_root; +again: + for (;;) { + struct work_atoms *data; + node = rb_first_cached(root); + if (!node) + break; + + rb_erase_cached(node, root); + data = rb_entry(node, struct work_atoms, node); + __thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list); + } + if (root == &sched->atom_root) { + root = &sched->merged_atom_root; + goto again; + } +} + +static int process_sched_wakeup_event(const struct perf_tool *tool, + struct perf_sample *sample, + struct machine *machine) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + + if (sched->tp_handler->wakeup_event) + return sched->tp_handler->wakeup_event(sched, sample, machine); + + return 0; +} + + +static bool thread__has_color(struct thread *thread) +{ + struct thread_runtime *tr = thread__priv(thread); + + return tr != NULL && tr->color; +} + +static struct thread* +map__findnew_thread(struct perf_sched *sched, struct machine *machine, pid_t pid, pid_t tid) +{ + struct thread *thread = machine__findnew_thread(machine, pid, tid); + + if (!sched->map.color_pids || !thread) + return thread; + + /* + * Always check the color-pids map, even if thread__priv() is + * already set. COMM events processed before the first sched_switch + * allocate a thread_runtime via thread__get_runtime(), so priv is + * non-NULL before we ever get here. Skipping the check on non-NULL + * priv would prevent those threads from being colored. + */ + if (thread_map__has(sched->map.color_pids, tid)) { + struct thread_runtime *tr = thread__get_runtime(thread); + + if (tr) + tr->color = true; + } + return thread; +} + +static bool sched_match_task(struct perf_sched *sched, const char *comm_str) +{ + bool fuzzy_match = sched->map.fuzzy; + struct strlist *task_names = sched->map.task_names; + struct str_node *node; + + strlist__for_each_entry(node, task_names) { + bool match_found = fuzzy_match ? !!strstr(comm_str, node->s) : + !strcmp(comm_str, node->s); + if (match_found) + return true; + } + + return false; +} + +static void print_sched_map(struct perf_sched *sched, struct perf_cpu this_cpu, int cpus_nr, + const char *color, bool sched_out) +{ + for (int i = 0; i < cpus_nr; i++) { + struct perf_cpu cpu = { + .cpu = sched->map.comp ? sched->map.comp_cpus[i].cpu : i, + }; + struct thread *curr_thread = sched->curr_thread[cpu.cpu]; + struct thread *curr_out_thread = sched->curr_out_thread[cpu.cpu]; + struct thread_runtime *curr_tr; + const char *pid_color = color; + const char *cpu_color = color; + char symbol = ' '; + struct thread *thread_to_check = sched_out ? curr_out_thread : curr_thread; + + if (thread_to_check && thread__has_color(thread_to_check)) + pid_color = COLOR_PIDS; + + if (sched->map.color_cpus && perf_cpu_map__has(sched->map.color_cpus, cpu)) + cpu_color = COLOR_CPUS; + + if (cpu.cpu == this_cpu.cpu) + symbol = '*'; + + color_fprintf(stdout, cpu.cpu != this_cpu.cpu ? color : cpu_color, "%c", symbol); + + thread_to_check = sched_out ? sched->curr_out_thread[cpu.cpu] : + sched->curr_thread[cpu.cpu]; + + if (thread_to_check) { + curr_tr = thread__get_runtime(thread_to_check); + if (curr_tr == NULL) + return; + + if (sched_out) { + if (cpu.cpu == this_cpu.cpu) + color_fprintf(stdout, color, "- "); + else { + curr_tr = thread__get_runtime(sched->curr_thread[cpu.cpu]); + if (curr_tr != NULL) + color_fprintf(stdout, pid_color, "%2s ", + curr_tr->shortname); + } + } else + color_fprintf(stdout, pid_color, "%2s ", curr_tr->shortname); + } else + color_fprintf(stdout, color, " "); + } +} + +static int map_switch_event(struct perf_sched *sched, struct perf_sample *sample, + struct machine *machine) +{ + const u32 next_pid = perf_sample__intval(sample, "next_pid"); + const u32 prev_pid = perf_sample__intval(sample, "prev_pid"); + struct thread *sched_in, *sched_out; + struct thread_runtime *tr; + int new_shortname; + u64 timestamp0, timestamp = sample->time; + s64 delta; + struct perf_cpu this_cpu = { + .cpu = sample->cpu, + }; + int cpus_nr; + int proceed; + bool new_cpu = false; + const char *color = PERF_COLOR_NORMAL; + char stimestamp[32]; + const char *str; + int ret = -1; + + /* perf.data is untrusted input — CPU may be absent or corrupted */ + if (this_cpu.cpu >= MAX_CPUS || this_cpu.cpu < 0) { + pr_warning("WARNING: at offset %#" PRIx64 ": out-of-bound sample CPU %d, skipping sample\n", + sample->file_offset, this_cpu.cpu); + return 0; + } + + if (this_cpu.cpu > sched->max_cpu.cpu) + sched->max_cpu = this_cpu; + + if (sched->map.comp) { + cpus_nr = bitmap_weight(sched->map.comp_cpus_mask, MAX_CPUS); + if (!__test_and_set_bit(this_cpu.cpu, sched->map.comp_cpus_mask)) { + sched->map.comp_cpus[cpus_nr++] = this_cpu; + new_cpu = true; + } + } else + cpus_nr = sched->max_cpu.cpu + 1; + + timestamp0 = sched->cpu_last_switched[this_cpu.cpu]; + sched->cpu_last_switched[this_cpu.cpu] = timestamp; + if (timestamp0) + delta = timestamp - timestamp0; + else + delta = 0; + + if (delta < 0) { + pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta); + return -1; + } + + sched_in = map__findnew_thread(sched, machine, -1, next_pid); + sched_out = map__findnew_thread(sched, machine, -1, prev_pid); + if (sched_in == NULL || sched_out == NULL) + goto out; + + tr = thread__get_runtime(sched_in); + if (tr == NULL) + goto out; + + thread__put(sched->curr_thread[this_cpu.cpu]); + thread__put(sched->curr_out_thread[this_cpu.cpu]); + + sched->curr_thread[this_cpu.cpu] = thread__get(sched_in); + sched->curr_out_thread[this_cpu.cpu] = thread__get(sched_out); + + ret = 0; + + str = thread__comm_str(sched_in); + new_shortname = 0; + if (!tr->shortname[0]) { + if (!strcmp(thread__comm_str(sched_in), "swapper")) { + /* + * Don't allocate a letter-number for swapper:0 + * as a shortname. Instead, we use '.' for it. + */ + tr->shortname[0] = '.'; + tr->shortname[1] = ' '; + } else if (!sched->map.task_name || sched_match_task(sched, str)) { + tr->shortname[0] = sched->next_shortname1; + tr->shortname[1] = sched->next_shortname2; + + if (sched->next_shortname1 < 'Z') { + sched->next_shortname1++; + } else { + sched->next_shortname1 = 'A'; + if (sched->next_shortname2 < '9') + sched->next_shortname2++; + else + sched->next_shortname2 = '0'; + } + } else { + tr->shortname[0] = '-'; + tr->shortname[1] = ' '; + } + new_shortname = 1; + } + + if (sched->map.cpus && !perf_cpu_map__has(sched->map.cpus, this_cpu)) + goto out; + + proceed = 0; + str = thread__comm_str(sched_in); + /* + * Check which of sched_in and sched_out matches the passed --task-name + * arguments and call the corresponding print_sched_map. + */ + if (sched->map.task_name && !sched_match_task(sched, str)) { + if (!sched_match_task(sched, thread__comm_str(sched_out))) + goto out; + else + goto sched_out; + + } else { + str = thread__comm_str(sched_out); + if (!(sched->map.task_name && !sched_match_task(sched, str))) + proceed = 1; + } + + printf(" "); + + print_sched_map(sched, this_cpu, cpus_nr, color, false); + + timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp)); + color_fprintf(stdout, color, " %12s secs ", stimestamp); + if (new_shortname || tr->comm_changed || (verbose > 0 && thread__tid(sched_in))) { + const char *pid_color = color; + + if (thread__has_color(sched_in)) + pid_color = COLOR_PIDS; + + color_fprintf(stdout, pid_color, "%s => %s:%d", + tr->shortname, thread__comm_str(sched_in), thread__tid(sched_in)); + tr->comm_changed = false; + } + + if (sched->map.comp && new_cpu) + color_fprintf(stdout, color, " (CPU %d)", this_cpu.cpu); + + if (proceed != 1) { + color_fprintf(stdout, color, "\n"); + goto out; + } + +sched_out: + if (sched->map.task_name) { + tr = thread__get_runtime(sched->curr_out_thread[this_cpu.cpu]); + if (tr == NULL || strcmp(tr->shortname, "") == 0) + goto out; + + if (proceed == 1) + color_fprintf(stdout, color, "\n"); + + printf(" "); + print_sched_map(sched, this_cpu, cpus_nr, color, true); + timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp)); + color_fprintf(stdout, color, " %12s secs ", stimestamp); + } + + color_fprintf(stdout, color, "\n"); + +out: + thread__put(sched_out); + thread__put(sched_in); + + return ret; +} + +static int process_sched_switch_event(const struct perf_tool *tool, + struct perf_sample *sample, + struct machine *machine) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + int this_cpu = sample->cpu, err = 0; + u32 prev_pid = perf_sample__intval(sample, "prev_pid"), + next_pid = perf_sample__intval(sample, "next_pid"); + + /* perf.data is untrusted input — CPU may be absent or corrupted */ + if (this_cpu < 0 || this_cpu >= MAX_CPUS) { + pr_warning("WARNING: at offset %#" PRIx64 ": out-of-bound sample CPU %d, skipping sample\n", + sample->file_offset, this_cpu); + return 0; + } + + if (sched->curr_pid[this_cpu] != (u32)-1) { + /* + * Are we trying to switch away a PID that is + * not current? + */ + if (sched->curr_pid[this_cpu] != prev_pid) + sched->nr_context_switch_bugs++; + } + + if (sched->tp_handler->switch_event) + err = sched->tp_handler->switch_event(sched, sample, machine); + + sched->curr_pid[this_cpu] = next_pid; + return err; +} + +static int process_sched_runtime_event(const struct perf_tool *tool, + struct perf_sample *sample, + struct machine *machine) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + + /* perf.data is untrusted input — CPU may be absent or corrupted */ + if (sample->cpu >= MAX_CPUS) { + pr_warning("WARNING: at offset %#" PRIx64 ": out-of-bound sample CPU %u, skipping sample\n", + sample->file_offset, sample->cpu); + return 0; + } + + if (sched->tp_handler->runtime_event) + return sched->tp_handler->runtime_event(sched, sample, machine); + + return 0; +} + +static int perf_sched__process_fork_event(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + + /* run the fork event through the perf machinery */ + perf_event__process_fork(tool, event, sample, machine); + + /* and then run additional processing needed for this command */ + if (sched->tp_handler->fork_event) + return sched->tp_handler->fork_event(sched, event, machine); + + return 0; +} + +static int process_sched_migrate_task_event(const struct perf_tool *tool, + struct perf_sample *sample, + struct machine *machine) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + + if (sched->tp_handler->migrate_task_event) + return sched->tp_handler->migrate_task_event(sched, sample, machine); + + return 0; +} + +typedef int (*tracepoint_handler)(const struct perf_tool *tool, + struct perf_sample *sample, + struct machine *machine); + +static struct evsel_str_handler latency_handlers[] = { + { "sched:sched_switch", process_sched_switch_event, }, + { "sched:sched_stat_runtime", process_sched_runtime_event, }, + { "sched:sched_wakeup", process_sched_wakeup_event, }, + { "sched:sched_waking", process_sched_wakeup_event, }, + { "sched:sched_wakeup_new", process_sched_wakeup_event, }, + { "sched:sched_migrate_task", process_sched_migrate_task_event, }, +}; + +static int process_sched_ignore(const struct perf_tool *tool __maybe_unused, + struct perf_sample *sample __maybe_unused, + struct machine *machine __maybe_unused) +{ + return 0; +} + +static int perf_sched__process_tracepoint_sample(const struct perf_tool *tool __maybe_unused, + union perf_event *event __maybe_unused, + struct perf_sample *sample, + struct machine *machine) +{ + struct evsel *evsel = sample->evsel; + int err = 0; + + if (evsel->handler == NULL) { + evsel->handler = process_sched_ignore; + for (size_t i = 0; i < ARRAY_SIZE(latency_handlers); i++) { + if (!evsel__name_is(evsel, latency_handlers[i].name)) + continue; + + if (!strcmp(latency_handlers[i].name, "sched:sched_wakeup") && + sample->evsel->evlist && + evlist__find_tracepoint_by_name(sample->evsel->evlist, "sched:sched_waking")) + break; + + evsel->handler = latency_handlers[i].handler; + break; + } + } + + if (evsel->handler != process_sched_ignore) { + tracepoint_handler f = evsel->handler; + err = f(tool, sample, machine); + } + + return err; +} + +static int perf_sched__process_comm(const struct perf_tool *tool __maybe_unused, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct thread *thread; + struct thread_runtime *tr; + int err; + + err = perf_event__process_comm(tool, event, sample, machine); + if (err) + return err; + + thread = machine__find_thread(machine, sample->pid, sample->tid); + if (!thread) { + pr_err("Internal error: can't find thread\n"); + return -1; + } + + tr = thread__get_runtime(thread); + if (tr == NULL) { + thread__put(thread); + return -1; + } + + tr->comm_changed = true; + thread__put(thread); + + return 0; +} + +static int perf_sched__read_events(struct perf_sched *sched) +{ + struct perf_session *session; + struct perf_data data = { + .path = input_name, + .mode = PERF_DATA_MODE_READ, + .force = sched->force, + }; + int rc = -1, err; + + session = perf_session__new(&data, &sched->tool); + if (IS_ERR(session)) { + pr_debug("Error creating perf session"); + return PTR_ERR(session); + } + + symbol__init(perf_session__env(session)); + + if (!perf_data__is_pipe(session->data)) { + /* prefer sched_waking if it is captured */ + if (evlist__find_tracepoint_by_name(session->evlist, "sched:sched_waking")) + latency_handlers[2].handler = process_sched_ignore; + + if (perf_session__set_tracepoints_handlers(session, latency_handlers)) + goto out_delete; + } + + if (!perf_data__is_pipe(session->data) && + !perf_session__has_traces(session, "record -R")) + goto out_delete; + + err = perf_session__process_events(session); + if (err) { + pr_err("Failed to process events, error %d", err); + goto out_delete; + } + + if (perf_data__is_pipe(session->data) && + !perf_session__has_traces(session, "record -R")) { + goto out_delete; + } + + sched->nr_events = evlist__stats(session->evlist)->nr_events[0]; + sched->nr_lost_events = evlist__stats(session->evlist)->total_lost; + sched->nr_lost_chunks = evlist__stats(session->evlist)->nr_events[PERF_RECORD_LOST]; + + rc = 0; +out_delete: + perf_session__delete(session); + return rc; +} + +/* + * scheduling times are printed as msec.usec + */ +static inline void print_sched_time(unsigned long long nsecs, int width) +{ + unsigned long msecs; + unsigned long usecs; + + msecs = nsecs / NSEC_PER_MSEC; + nsecs -= msecs * NSEC_PER_MSEC; + usecs = nsecs / NSEC_PER_USEC; + printf("%*lu.%03lu ", width, msecs, usecs); +} + +/* + * returns runtime data for event, allocating memory for it the + * first time it is used. + */ +static struct evsel_runtime *evsel__get_runtime(struct evsel *evsel) +{ + struct evsel_runtime *r = evsel->priv; + + if (r == NULL) { + r = zalloc(sizeof(struct evsel_runtime)); + evsel->priv = r; + } + + return r; +} + +/* + * save last time event was seen per cpu + */ +static void evsel__save_time(struct evsel *evsel, u64 timestamp, u32 cpu) +{ + struct evsel_runtime *r = evsel__get_runtime(evsel); + + if (r == NULL) + return; + + if ((cpu >= r->ncpu) || (r->last_time == NULL)) { + int i, n = __roundup_pow_of_two(cpu+1); + void *p = r->last_time; + + p = realloc(r->last_time, n * sizeof(u64)); + if (!p) + return; + + r->last_time = p; + for (i = r->ncpu; i < n; ++i) + r->last_time[i] = (u64) 0; + + r->ncpu = n; + } + + r->last_time[cpu] = timestamp; +} + +/* returns last time this event was seen on the given cpu */ +static u64 evsel__get_time(struct evsel *evsel, u32 cpu) +{ + struct evsel_runtime *r = evsel__get_runtime(evsel); + + if ((r == NULL) || (r->last_time == NULL) || (cpu >= r->ncpu)) + return 0; + + return r->last_time[cpu]; +} + +static void timehist__evsel_priv_destructor(void *priv) +{ + struct evsel_runtime *r = priv; + + if (r) { + free(r->last_time); + free(r); + } +} + +static int comm_width = 30; + +static char *timehist_get_commstr(struct thread *thread) +{ + static char str[32]; + const char *comm = thread__comm_str(thread); + pid_t tid = thread__tid(thread); + pid_t pid = thread__pid(thread); + int n; + + if (pid == 0) + n = scnprintf(str, sizeof(str), "%s", comm); + + else if (tid != pid) + n = scnprintf(str, sizeof(str), "%s[%d/%d]", comm, tid, pid); + + else + n = scnprintf(str, sizeof(str), "%s[%d]", comm, tid); + + if (n > comm_width) + comm_width = n; + + return str; +} + +/* prio field format: xxx or xxx->yyy */ +#define MAX_PRIO_STR_LEN 8 +static char *timehist_get_priostr(struct thread *thread, + struct perf_sample *sample) +{ + static char prio_str[16]; + int prev_prio = (int)perf_sample__intval(sample, "prev_prio"); + struct thread_runtime *tr = thread__priv(thread); + + if (tr->prio != prev_prio && tr->prio != -1) + scnprintf(prio_str, sizeof(prio_str), "%d->%d", tr->prio, prev_prio); + else + scnprintf(prio_str, sizeof(prio_str), "%d", prev_prio); + + return prio_str; +} + +static void timehist_header(struct perf_sched *sched) +{ + u32 ncpus = sched->max_cpu.cpu + 1; + u32 i, j; + + printf("%15s %6s ", "time", "cpu"); + + if (sched->show_cpu_visual) { + printf(" "); + for (i = 0, j = 0; i < ncpus; ++i) { + printf("%x", j++); + if (j > 15) + j = 0; + } + printf(" "); + } + + printf(" %-*s", comm_width, "task name"); + + if (sched->show_prio) + printf(" %-*s", MAX_PRIO_STR_LEN, "prio"); + + printf(" %9s %9s %9s", "wait time", "sch delay", "run time"); + + if (sched->pre_migrations) + printf(" %9s", "pre-mig time"); + + if (sched->show_state) + printf(" %s", "state"); + + printf("\n"); + + /* + * units row + */ + printf("%15s %-6s ", "", ""); + + if (sched->show_cpu_visual) + printf(" %*s ", ncpus, ""); + + printf(" %-*s", comm_width, "[tid/pid]"); + + if (sched->show_prio) + printf(" %-*s", MAX_PRIO_STR_LEN, ""); + + printf(" %9s %9s %9s", "(msec)", "(msec)", "(msec)"); + + if (sched->pre_migrations) + printf(" %9s", "(msec)"); + + printf("\n"); + + /* + * separator + */ + printf("%.15s %.6s ", graph_dotted_line, graph_dotted_line); + + if (sched->show_cpu_visual) + printf(" %.*s ", ncpus, graph_dotted_line); + + printf(" %.*s", comm_width, graph_dotted_line); + + if (sched->show_prio) + printf(" %.*s", MAX_PRIO_STR_LEN, graph_dotted_line); + + printf(" %.9s %.9s %.9s", graph_dotted_line, graph_dotted_line, graph_dotted_line); + + if (sched->pre_migrations) + printf(" %.9s", graph_dotted_line); + + if (sched->show_state) + printf(" %.5s", graph_dotted_line); + + printf("\n"); +} + +static void timehist_print_sample(struct perf_sched *sched, + struct perf_sample *sample, + struct addr_location *al, + struct thread *thread, + u64 t, const char state) +{ + struct thread_runtime *tr = thread__priv(thread); + const char *next_comm = perf_sample__strval(sample, "next_comm"); + const u32 next_pid = perf_sample__intval(sample, "next_pid"); + u32 max_cpus = sched->max_cpu.cpu + 1; + char tstr[64]; + char nstr[30]; + u64 wait_time; + + if (cpu_list && (sample->cpu >= MAX_NR_CPUS || + !test_bit(sample->cpu, cpu_bitmap))) + return; + + timestamp__scnprintf_usec(t, tstr, sizeof(tstr)); + printf("%15s [%04d] ", tstr, sample->cpu); + + if (sched->show_cpu_visual) { + u32 i; + char c; + + printf(" "); + for (i = 0; i < max_cpus; ++i) { + /* flag idle times with 'i'; others are sched events */ + if (i == sample->cpu) + c = (thread__tid(thread) == 0) ? 'i' : 's'; + else + c = ' '; + printf("%c", c); + } + printf(" "); + } + + printf(" %-*s ", comm_width, timehist_get_commstr(thread)); + + if (sched->show_prio) + printf(" %-*s ", MAX_PRIO_STR_LEN, timehist_get_priostr(thread, sample)); + + wait_time = tr->dt_sleep + tr->dt_iowait + tr->dt_preempt; + print_sched_time(wait_time, 6); + + print_sched_time(tr->dt_delay, 6); + print_sched_time(tr->dt_run, 6); + if (sched->pre_migrations) + print_sched_time(tr->dt_pre_mig, 6); + + if (sched->show_state) + printf(" %5c ", thread__tid(thread) == 0 ? 'I' : state); + + if (sched->show_next) { + snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid); + printf(" %-*s", comm_width, nstr); + } + + if (sched->show_wakeups && !sched->show_next) + printf(" %-*s", comm_width, ""); + + if (thread__tid(thread) == 0) + goto out; + + if (sched->show_callchain) + printf(" "); + + sample__fprintf_sym(sample, al, 0, + EVSEL__PRINT_SYM | EVSEL__PRINT_ONELINE | + EVSEL__PRINT_CALLCHAIN_ARROW | + EVSEL__PRINT_SKIP_IGNORED, + get_tls_callchain_cursor(), symbol_conf.bt_stop_list, stdout); + +out: + printf("\n"); +} + +/* + * Explanation of delta-time stats: + * + * t = time of current schedule out event + * tprev = time of previous sched out event + * also time of schedule-in event for current task + * last_time = time of last sched change event for current task + * (i.e, time process was last scheduled out) + * ready_to_run = time of wakeup for current task + * migrated = time of task migration to another CPU + * + * -----|-------------|-------------|-------------|-------------|----- + * last ready migrated tprev t + * time to run + * + * |---------------- dt_wait ----------------| + * |--------- dt_delay ---------|-- dt_run --| + * |- dt_pre_mig -| + * + * dt_run = run time of current task + * dt_wait = time between last schedule out event for task and tprev + * represents time spent off the cpu + * dt_delay = time between wakeup and schedule-in of task + * dt_pre_mig = time between wakeup and migration to another CPU + */ + +static void timehist_update_runtime_stats(struct thread_runtime *r, + u64 t, u64 tprev) +{ + r->dt_delay = 0; + r->dt_sleep = 0; + r->dt_iowait = 0; + r->dt_preempt = 0; + r->dt_run = 0; + r->dt_pre_mig = 0; + + if (tprev) { + r->dt_run = t - tprev; + if (r->ready_to_run) { + if (r->ready_to_run > tprev) + pr_debug("time travel: wakeup time for task > previous sched_switch event\n"); + else + r->dt_delay = tprev - r->ready_to_run; + + if ((r->migrated > r->ready_to_run) && (r->migrated < tprev)) + r->dt_pre_mig = r->migrated - r->ready_to_run; + } + + if (r->last_time > tprev) + pr_debug("time travel: last sched out time for task > previous sched_switch event\n"); + else if (r->last_time) { + u64 dt_wait = tprev - r->last_time; + + if (r->last_state == 'R') + r->dt_preempt = dt_wait; + else if (r->last_state == 'D') + r->dt_iowait = dt_wait; + else + r->dt_sleep = dt_wait; + } + } + + update_stats(&r->run_stats, r->dt_run); + + r->total_run_time += r->dt_run; + r->total_delay_time += r->dt_delay; + r->total_sleep_time += r->dt_sleep; + r->total_iowait_time += r->dt_iowait; + r->total_preempt_time += r->dt_preempt; + r->total_pre_mig_time += r->dt_pre_mig; +} + +static bool is_idle_sample(struct perf_sample *sample) +{ + /* pid 0 == swapper == idle task */ + if (evsel__name_is(sample->evsel, "sched:sched_switch")) + return perf_sample__intval(sample, "prev_pid") == 0; + + return sample->pid == 0; +} + +static void save_task_callchain(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine) +{ + struct callchain_cursor *cursor; + struct thread *thread; + + /* want main thread for process - has maps */ + thread = machine__findnew_thread(machine, sample->pid, sample->pid); + if (thread == NULL) { + pr_debug("Failed to get thread for pid %d.\n", sample->pid); + return; + } + + if (!sched->show_callchain || sample->callchain == NULL) { + thread__put(thread); + return; + } + + cursor = get_tls_callchain_cursor(); + + if (thread__resolve_callchain(thread, cursor, sample, + NULL, NULL, sched->max_stack + 2) != 0) { + if (verbose > 0) + pr_err("Failed to resolve callchain. Skipping\n"); + + thread__put(thread); + return; + } + + callchain_cursor_commit(cursor); + thread__put(thread); + + while (true) { + struct callchain_cursor_node *node; + struct symbol *sym; + + node = callchain_cursor_current(cursor); + if (node == NULL) + break; + + sym = node->ms.sym; + if (sym) { + if (!strcmp(sym->name, "schedule") || + !strcmp(sym->name, "__schedule") || + !strcmp(sym->name, "preempt_schedule")) + symbol__set_ignore(sym, true); + } + + callchain_cursor_advance(cursor); + } +} + +static int init_idle_thread(struct thread *thread) +{ + struct idle_thread_runtime *itr; + + thread__set_comm(thread, idle_comm, 0); + + itr = zalloc(sizeof(*itr)); + if (itr == NULL) + return -ENOMEM; + + init_prio(&itr->tr); + init_stats(&itr->tr.run_stats); + callchain_init(&itr->callchain); + callchain_cursor_reset(&itr->cursor); + thread__set_priv(thread, itr); + + return 0; +} + +/* + * Track idle stats per cpu by maintaining a local thread + * struct for the idle task on each cpu. + */ +static int init_idle_threads(int ncpu) +{ + int i, ret; + + idle_threads = calloc(ncpu, sizeof(struct thread *)); + if (!idle_threads) + return -ENOMEM; + + idle_max_cpu = ncpu; + + /* allocate the actual thread struct if needed */ + for (i = 0; i < ncpu; ++i) { + idle_threads[i] = thread__new(0, 0); + if (idle_threads[i] == NULL) + return -ENOMEM; + + ret = init_idle_thread(idle_threads[i]); + if (ret < 0) + return ret; + } + + return 0; +} + +static void free_idle_threads(void) +{ + int i; + + if (idle_threads == NULL) + return; + + for (i = 0; i < idle_max_cpu; ++i) { + struct thread *idle = idle_threads[i]; + + if (idle) { + struct idle_thread_runtime *itr; + + itr = thread__priv(idle); + if (itr) { + thread__put(itr->last_thread); + free_callchain(&itr->callchain); + callchain_cursor_cleanup(&itr->cursor); + } + + thread__put(idle); + } + } + + free(idle_threads); +} + +static struct thread *get_idle_thread(int cpu) +{ + /* + * expand/allocate array of pointers to local thread + * structs if needed + */ + if ((cpu >= idle_max_cpu) || (idle_threads == NULL)) { + int i, j = __roundup_pow_of_two(cpu+1); + void *p; + + p = realloc(idle_threads, j * sizeof(struct thread *)); + if (!p) + return NULL; + + idle_threads = (struct thread **) p; + for (i = idle_max_cpu; i < j; ++i) + idle_threads[i] = NULL; + + idle_max_cpu = j; + } + + /* allocate a new thread struct if needed */ + if (idle_threads[cpu] == NULL) { + idle_threads[cpu] = thread__new(0, 0); + + if (idle_threads[cpu]) { + if (init_idle_thread(idle_threads[cpu]) < 0) { + /* clean up so next call doesn't find a half-initialized thread */ + thread__zput(idle_threads[cpu]); + return NULL; + } + } + } + + return thread__get(idle_threads[cpu]); +} + +static void save_idle_callchain(struct perf_sched *sched, + struct idle_thread_runtime *itr, + struct perf_sample *sample) +{ + struct callchain_cursor *cursor; + + if (!sched->show_callchain || sample->callchain == NULL) + return; + + cursor = get_tls_callchain_cursor(); + if (cursor == NULL) + return; + + callchain_cursor__copy(&itr->cursor, cursor); +} + +static struct thread *timehist_get_thread(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine) +{ + struct thread *thread; + + if (is_idle_sample(sample)) { + thread = get_idle_thread(sample->cpu); + if (thread == NULL) + pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu); + + } else { + /* there were samples with tid 0 but non-zero pid */ + thread = machine__findnew_thread(machine, sample->pid, + sample->tid ?: sample->pid); + if (thread == NULL) { + pr_debug("Failed to get thread for tid %d. skipping sample.\n", + sample->tid); + } + + save_task_callchain(sched, sample, machine); + if (sched->idle_hist) { + struct thread *idle; + struct idle_thread_runtime *itr; + + idle = get_idle_thread(sample->cpu); + if (idle == NULL) { + pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu); + thread__put(thread); + return NULL; + } + + itr = thread__priv(idle); + if (itr == NULL) { + thread__put(idle); + thread__put(thread); + return NULL; + } + + thread__put(itr->last_thread); + itr->last_thread = thread__get(thread); + + /* copy task callchain when entering to idle */ + if (perf_sample__intval(sample, "next_pid") == 0) + save_idle_callchain(sched, itr, sample); + + thread__put(idle); + } + } + + return thread; +} + +static bool timehist_skip_sample(struct perf_sched *sched, + struct thread *thread, + struct perf_sample *sample) +{ + bool rc = false; + int prio = -1; + struct thread_runtime *tr = NULL; + + if (thread__is_filtered(thread)) { + rc = true; + sched->skipped_samples++; + } + + if (sched->prio_str) { + /* + * Because priority may be changed during task execution, + * first read priority from prev sched_in event for current task. + * If prev sched_in event is not saved, then read priority from + * current task sched_out event. + */ + tr = thread__get_runtime(thread); + if (tr && tr->prio != -1) + prio = tr->prio; + else if (evsel__name_is(sample->evsel, "sched:sched_switch")) + prio = perf_sample__intval(sample, "prev_prio"); + + /* negative prio means no info; out-of-range prio can't match the filter */ + if (prio >= 0 && + (prio >= MAX_PRIO || !test_bit(prio, sched->prio_bitmap))) { + rc = true; + sched->skipped_samples++; + } + } + + if (sched->idle_hist) { + if (!evsel__name_is(sample->evsel, "sched:sched_switch")) + rc = true; + else if (perf_sample__intval(sample, "prev_pid") != 0 && + perf_sample__intval(sample, "next_pid") != 0) + rc = true; + } + + return rc; +} + +static void timehist_print_wakeup_event(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine, + struct thread *awakened) +{ + struct thread *thread; + char tstr[64]; + + thread = machine__findnew_thread(machine, sample->pid, sample->tid); + if (thread == NULL) + return; + + /* show wakeup unless both awakee and awaker are filtered */ + if (timehist_skip_sample(sched, thread, sample) && + timehist_skip_sample(sched, awakened, sample)) { + thread__put(thread); + return; + } + + timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr)); + printf("%15s [%04d] ", tstr, sample->cpu); + if (sched->show_cpu_visual) + printf(" %*s ", sched->max_cpu.cpu + 1, ""); + + printf(" %-*s ", comm_width, timehist_get_commstr(thread)); + + /* dt spacer */ + printf(" %9s %9s %9s ", "", "", ""); + + printf("awakened: %s", timehist_get_commstr(awakened)); + + printf("\n"); + + thread__put(thread); +} + +static int timehist_sched_wakeup_ignore(const struct perf_tool *tool __maybe_unused, + union perf_event *event __maybe_unused, + struct perf_sample *sample __maybe_unused, + struct machine *machine __maybe_unused) +{ + return 0; +} + +static int timehist_sched_wakeup_event(const struct perf_tool *tool, + union perf_event *event __maybe_unused, + struct perf_sample *sample, + struct machine *machine) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + struct thread *thread; + struct thread_runtime *tr = NULL; + /* want pid of awakened task not pid in sample */ + const u32 pid = perf_sample__intval(sample, "pid"); + + thread = machine__findnew_thread(machine, 0, pid); + if (thread == NULL) + return -1; + + tr = thread__get_runtime(thread); + if (tr == NULL) { + thread__put(thread); + return -1; + } + + if (tr->ready_to_run == 0) + tr->ready_to_run = sample->time; + + /* show wakeups if requested */ + if (sched->show_wakeups && + !perf_time__skip_sample(&sched->ptime, sample->time)) + timehist_print_wakeup_event(sched, sample, machine, thread); + + thread__put(thread); + return 0; +} + +static void timehist_print_migration_event(struct perf_sched *sched, + struct perf_sample *sample, + struct machine *machine, + struct thread *migrated) +{ + struct thread *thread; + char tstr[64]; + u32 max_cpus; + u32 ocpu, dcpu; + + if (sched->summary_only) + return; + + max_cpus = sched->max_cpu.cpu + 1; + ocpu = perf_sample__intval(sample, "orig_cpu"); + dcpu = perf_sample__intval(sample, "dest_cpu"); + + thread = machine__findnew_thread(machine, sample->pid, sample->tid); + if (thread == NULL) + return; + + if (timehist_skip_sample(sched, thread, sample) && + timehist_skip_sample(sched, migrated, sample)) { + thread__put(thread); + return; + } + + timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr)); + printf("%15s [%04d] ", tstr, sample->cpu); + + if (sched->show_cpu_visual) { + u32 i; + char c; + + printf(" "); + for (i = 0; i < max_cpus; ++i) { + c = (i == sample->cpu) ? 'm' : ' '; + printf("%c", c); + } + printf(" "); + } + + printf(" %-*s ", comm_width, timehist_get_commstr(thread)); + + /* dt spacer */ + printf(" %9s %9s %9s ", "", "", ""); + + printf("migrated: %s", timehist_get_commstr(migrated)); + printf(" cpu %d => %d", ocpu, dcpu); + + printf("\n"); + thread__put(thread); +} + +static int timehist_migrate_task_event(const struct perf_tool *tool, + union perf_event *event __maybe_unused, + struct perf_sample *sample, + struct machine *machine) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + struct thread *thread; + struct thread_runtime *tr = NULL; + /* want pid of migrated task not pid in sample */ + const u32 pid = perf_sample__intval(sample, "pid"); + + thread = machine__findnew_thread(machine, 0, pid); + if (thread == NULL) + return -1; + + tr = thread__get_runtime(thread); + if (tr == NULL) { + thread__put(thread); + return -1; + } + + tr->migrations++; + tr->migrated = sample->time; + + /* show migrations if requested */ + if (sched->show_migrations) { + timehist_print_migration_event(sched, sample, machine, thread); + } + thread__put(thread); + + return 0; +} + +static void timehist_update_task_prio(struct perf_sample *sample, + struct machine *machine) +{ + struct thread *thread; + struct thread_runtime *tr = NULL; + const u32 next_pid = perf_sample__intval(sample, "next_pid"); + const u32 next_prio = perf_sample__intval(sample, "next_prio"); + + if (next_pid == 0) + thread = get_idle_thread(sample->cpu); + else + thread = machine__findnew_thread(machine, -1, next_pid); + + if (thread == NULL) + return; + + tr = thread__get_runtime(thread); + if (tr != NULL) + tr->prio = next_prio; + + thread__put(thread); +} + +static int timehist_sched_change_event(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + struct perf_time_interval *ptime = &sched->ptime; + struct addr_location al; + struct thread *thread = NULL; + struct thread_runtime *tr = NULL; + u64 tprev, t = sample->time; + int rc = 0; + const char state = perf_sample__taskstate(sample, "prev_state"); + + /* perf.data is untrusted input — CPU may be absent or corrupted */ + if (sample->cpu >= MAX_CPUS) { + pr_warning("WARNING: at offset %#" PRIx64 ": out-of-bound sample CPU %d, skipping sample\n", + sample->file_offset, sample->cpu); + return 0; + } + + addr_location__init(&al); + if (machine__resolve(machine, &al, sample) < 0) { + pr_err("problem processing %s (%u) event at offset %#" PRIx64 ", skipping it\n", + perf_event__name(event->header.type), event->header.type, + sample->file_offset); + rc = -1; + goto out; + } + + if (sched->show_prio || sched->prio_str) + timehist_update_task_prio(sample, machine); + + thread = timehist_get_thread(sched, sample, machine); + if (thread == NULL) { + rc = -1; + goto out; + } + + if (timehist_skip_sample(sched, thread, sample)) + goto out; + + tr = thread__get_runtime(thread); + if (tr == NULL) { + rc = -1; + goto out; + } + + tprev = evsel__get_time(sample->evsel, sample->cpu); + + /* + * If start time given: + * - sample time is under window user cares about - skip sample + * - tprev is under window user cares about - reset to start of window + */ + if (ptime->start && ptime->start > t) + goto out; + + if (tprev && ptime->start > tprev) + tprev = ptime->start; + + /* + * If end time given: + * - previous sched event is out of window - we are done + * - sample time is beyond window user cares about - reset it + * to close out stats for time window interest + * - If tprev is 0, that is, sched_in event for current task is + * not recorded, cannot determine whether sched_in event is + * within time window interest - ignore it + */ + if (ptime->end) { + if (!tprev || tprev > ptime->end) + goto out; + + if (t > ptime->end) + t = ptime->end; + } + + /* + * Use is_idle_sample() not thread__tid() == 0: a crafted perf.data + * can set common_pid=0 with prev_pid!=0, giving us a machine thread + * whose priv is thread_runtime, not idle_thread_runtime — the cast + * below would read past the allocation. + */ + if (!sched->idle_hist || is_idle_sample(sample)) { + if (!cpu_list || (sample->cpu < MAX_NR_CPUS && + test_bit(sample->cpu, cpu_bitmap))) + timehist_update_runtime_stats(tr, t, tprev); + + if (sched->idle_hist) { + struct idle_thread_runtime *itr = (void *)tr; + struct thread_runtime *last_tr; + + if (itr->last_thread == NULL) + goto out; + + /* add current idle time as last thread's runtime */ + last_tr = thread__get_runtime(itr->last_thread); + if (last_tr == NULL) + goto out; + + timehist_update_runtime_stats(last_tr, t, tprev); + /* + * remove delta time of last thread as it's not updated + * and otherwise it will show an invalid value next + * time. we only care total run time and run stat. + */ + last_tr->dt_run = 0; + last_tr->dt_delay = 0; + last_tr->dt_sleep = 0; + last_tr->dt_iowait = 0; + last_tr->dt_preempt = 0; + + if (itr->cursor.nr) + callchain_append(&itr->callchain, &itr->cursor, t - tprev); + + thread__zput(itr->last_thread); + } + + /* + * If the process name is not set for the thread, use "prev_comm" + * to set it. Otherwise the sched summary will have just pid information + */ + if (!thread__comm_set(thread)) { + const char *prev_comm = perf_sample__strval(sample, "prev_comm"); + + thread__set_comm(thread, prev_comm, sample->time); + } + + if (!sched->summary_only) + timehist_print_sample(sched, sample, &al, thread, t, state); + } + +out: + if (sched->hist_time.start == 0 && t >= ptime->start) + sched->hist_time.start = t; + if (ptime->end == 0 || t <= ptime->end) + sched->hist_time.end = t; + + if (tr) { + /* time of this sched_switch event becomes last time task seen */ + tr->last_time = sample->time; + + /* last state is used to determine where to account wait time */ + tr->last_state = state; + + /* sched out event for task so reset ready to run time and migrated time */ + if (state == 'R') + tr->ready_to_run = t; + else + tr->ready_to_run = 0; + + tr->migrated = 0; + } + + evsel__save_time(sample->evsel, sample->time, sample->cpu); + + thread__put(thread); + addr_location__exit(&al); + return rc; +} + +static int timehist_sched_switch_event(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine __maybe_unused) +{ + return timehist_sched_change_event(tool, event, sample, machine); +} + +static int process_lost(const struct perf_tool *tool __maybe_unused, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine __maybe_unused) +{ + char tstr[64]; + + timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr)); + printf("%15s ", tstr); + printf("lost %" PRI_lu64 " events on cpu %d\n", event->lost.lost, sample->cpu); + + return 0; +} + + +static void print_thread_runtime(struct thread *t, + struct thread_runtime *r) +{ + double mean = avg_stats(&r->run_stats); + float stddev; + + printf("%*s %5d %9" PRIu64 " ", + comm_width, timehist_get_commstr(t), thread__ppid(t), + (u64) r->run_stats.n); + + print_sched_time(r->total_run_time, 8); + stddev = rel_stddev_stats(stddev_stats(&r->run_stats), mean); + print_sched_time(r->run_stats.min, 6); + printf(" "); + print_sched_time((u64) mean, 6); + printf(" "); + print_sched_time(r->run_stats.max, 6); + printf(" "); + printf("%5.2f", stddev); + printf(" %5" PRIu64, r->migrations); + printf("\n"); +} + +static void print_thread_waittime(struct thread *t, + struct thread_runtime *r) +{ + printf("%*s %5d %9" PRIu64 " ", + comm_width, timehist_get_commstr(t), thread__ppid(t), + (u64) r->run_stats.n); + + print_sched_time(r->total_run_time, 8); + print_sched_time(r->total_sleep_time, 6); + printf(" "); + print_sched_time(r->total_iowait_time, 6); + printf(" "); + print_sched_time(r->total_preempt_time, 6); + printf(" "); + print_sched_time(r->total_delay_time, 6); + printf("\n"); +} + +struct total_run_stats { + struct perf_sched *sched; + u64 sched_count; + u64 task_count; + u64 total_run_time; +}; + +static int show_thread_runtime(struct thread *t, void *priv) +{ + struct total_run_stats *stats = priv; + struct thread_runtime *r; + + if (thread__is_filtered(t)) + return 0; + + r = thread__priv(t); + if (r && r->run_stats.n) { + stats->task_count++; + stats->sched_count += r->run_stats.n; + stats->total_run_time += r->total_run_time; + + if (stats->sched->show_state) + print_thread_waittime(t, r); + else + print_thread_runtime(t, r); + } + + return 0; +} + +static size_t callchain__fprintf_folded(FILE *fp, struct callchain_node *node) +{ + const char *sep = " <- "; + struct callchain_list *chain; + size_t ret = 0; + char bf[1024]; + bool first; + + if (node == NULL) + return 0; + + ret = callchain__fprintf_folded(fp, node->parent); + first = (ret == 0); + + list_for_each_entry(chain, &node->val, list) { + if (chain->ip >= PERF_CONTEXT_MAX) + continue; + if (chain->ms.sym && symbol__ignore(chain->ms.sym)) + continue; + ret += fprintf(fp, "%s%s", first ? "" : sep, + callchain_list__sym_name(chain, bf, sizeof(bf), + false)); + first = false; + } + + return ret; +} + +static size_t timehist_print_idlehist_callchain(struct rb_root_cached *root) +{ + size_t ret = 0; + FILE *fp = stdout; + struct callchain_node *chain; + /* sort() uses rb_insert_color() on rb_root, not rb_root_cached */ + struct rb_node *rb_node = rb_first(&root->rb_root); + + printf(" %16s %8s %s\n", "Idle time (msec)", "Count", "Callchains"); + printf(" %.16s %.8s %.50s\n", graph_dotted_line, graph_dotted_line, + graph_dotted_line); + + while (rb_node) { + chain = rb_entry(rb_node, struct callchain_node, rb_node); + rb_node = rb_next(rb_node); + + ret += fprintf(fp, " "); + print_sched_time(chain->hit, 12); + ret += 16; /* print_sched_time returns 2nd arg + 4 */ + ret += fprintf(fp, " %8d ", chain->count); + ret += callchain__fprintf_folded(fp, chain); + ret += fprintf(fp, "\n"); + } + + return ret; +} + +static void timehist_print_summary(struct perf_sched *sched, + struct perf_session *session) +{ + struct machine *m = &session->machines.host; + struct total_run_stats totals; + u64 task_count; + struct thread *t; + struct thread_runtime *r; + int i; + u64 hist_time = sched->hist_time.end - sched->hist_time.start; + + memset(&totals, 0, sizeof(totals)); + totals.sched = sched; + + if (sched->idle_hist) { + printf("\nIdle-time summary\n"); + printf("%*s parent sched-out ", comm_width, "comm"); + printf(" idle-time min-idle avg-idle max-idle stddev migrations\n"); + } else if (sched->show_state) { + printf("\nWait-time summary\n"); + printf("%*s parent sched-in ", comm_width, "comm"); + printf(" run-time sleep iowait preempt delay\n"); + } else { + printf("\nRuntime summary\n"); + printf("%*s parent sched-in ", comm_width, "comm"); + printf(" run-time min-run avg-run max-run stddev migrations\n"); + } + printf("%*s (count) ", comm_width, ""); + printf(" (msec) (msec) (msec) (msec) %s\n", + sched->show_state ? "(msec)" : "%"); + printf("%.117s\n", graph_dotted_line); + + machine__for_each_thread(m, show_thread_runtime, &totals); + task_count = totals.task_count; + if (!task_count) + printf("\n"); + + /* CPU idle stats not tracked when samples were skipped */ + if (sched->skipped_samples && !sched->idle_hist) + return; + + printf("\nIdle stats:\n"); + for (i = 0; i < idle_max_cpu; ++i) { + if (cpu_list && !test_bit(i, cpu_bitmap)) + continue; + + t = idle_threads[i]; + if (!t) + continue; + + r = thread__priv(t); + if (r && r->run_stats.n) { + totals.sched_count += r->run_stats.n; + printf(" CPU %2d idle for ", i); + print_sched_time(r->total_run_time, 6); + printf(" msec (%6.2f%%)\n", 100.0 * r->total_run_time / hist_time); + } else + printf(" CPU %2d idle entire time window\n", i); + } + + if (sched->idle_hist && sched->show_callchain) { + callchain_param.mode = CHAIN_FOLDED; + callchain_param.value = CCVAL_PERIOD; + + callchain_register_param(&callchain_param); + + printf("\nIdle stats by callchain:\n"); + for (i = 0; i < idle_max_cpu; ++i) { + struct idle_thread_runtime *itr; + + t = idle_threads[i]; + if (!t) + continue; + + itr = thread__priv(t); + if (itr == NULL) + continue; + + callchain_param.sort(&itr->sorted_root.rb_root, &itr->callchain, + 0, &callchain_param); + + printf(" CPU %2d:", i); + print_sched_time(itr->tr.total_run_time, 6); + printf(" msec\n"); + timehist_print_idlehist_callchain(&itr->sorted_root); + printf("\n"); + } + } + + printf("\n" + " Total number of unique tasks: %" PRIu64 "\n" + "Total number of context switches: %" PRIu64 "\n", + totals.task_count, totals.sched_count); + + printf(" Total run time (msec): "); + print_sched_time(totals.total_run_time, 2); + printf("\n"); + + printf(" Total scheduling time (msec): "); + print_sched_time(hist_time, 2); + printf(" (x %d)\n", sched->max_cpu.cpu); +} + +typedef int (*sched_handler)(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine); + +static int perf_timehist__process_sample(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + struct evsel *evsel = sample->evsel; + int err = 0; + struct perf_cpu this_cpu = { + .cpu = sample->cpu, + }; + + /* max_cpu indexes arrays allocated with MAX_CPUS entries */ + if (this_cpu.cpu >= 0 && this_cpu.cpu < MAX_CPUS && + this_cpu.cpu > sched->max_cpu.cpu) + sched->max_cpu = this_cpu; + + if (evsel->handler != NULL) { + sched_handler f = evsel->handler; + + err = f(tool, event, sample, machine); + } + + return err; +} + +static int timehist_check_attr(struct perf_sched *sched, + struct evlist *evlist) +{ + struct evsel *evsel; + struct evsel_runtime *er; + + list_for_each_entry(evsel, &evlist__core(evlist)->entries, core.node) { + er = evsel__get_runtime(evsel); + if (er == NULL) { + pr_err("Failed to allocate memory for evsel runtime data\n"); + return -1; + } + + /* only need to save callchain related to sched_switch event */ + if (sched->show_callchain && + evsel__name_is(evsel, "sched:sched_switch") && + !evsel__has_callchain(evsel)) { + pr_info("Samples of sched_switch event do not have callchains.\n"); + sched->show_callchain = 0; + symbol_conf.use_callchain = 0; + } + } + + return 0; +} + +static int timehist_parse_prio_str(struct perf_sched *sched) +{ + char *p; + unsigned long start_prio, end_prio; + const char *str = sched->prio_str; + + if (!str) + return 0; + + while (isdigit(*str)) { + p = NULL; + start_prio = strtoul(str, &p, 0); + if (start_prio >= MAX_PRIO || (*p != '\0' && *p != ',' && *p != '-')) + return -1; + + if (*p == '-') { + str = ++p; + p = NULL; + end_prio = strtoul(str, &p, 0); + + if (end_prio >= MAX_PRIO || (*p != '\0' && *p != ',')) + return -1; + + if (end_prio < start_prio) + return -1; + } else { + end_prio = start_prio; + } + + for (; start_prio <= end_prio; start_prio++) + __set_bit(start_prio, sched->prio_bitmap); + + if (*p) + ++p; + + str = p; + } + + return 0; +} + +static int perf_sched__timehist(struct perf_sched *sched) +{ + struct evsel_str_handler handlers[] = { + { "sched:sched_switch", timehist_sched_switch_event, }, + { "sched:sched_wakeup", timehist_sched_wakeup_event, }, + { "sched:sched_waking", timehist_sched_wakeup_event, }, + { "sched:sched_wakeup_new", timehist_sched_wakeup_event, }, + }; + const struct evsel_str_handler migrate_handlers[] = { + { "sched:sched_migrate_task", timehist_migrate_task_event, }, + }; + struct perf_data data = { + .path = input_name, + .mode = PERF_DATA_MODE_READ, + .force = sched->force, + }; + + struct perf_session *session; + struct perf_env *env; + struct evlist *evlist; + int err = -1; + + /* + * event handlers for timehist option + */ + sched->tool.sample = perf_timehist__process_sample; + sched->tool.mmap = perf_event__process_mmap; + sched->tool.mmap2 = perf_event__process_mmap2; + sched->tool.comm = perf_event__process_comm; + sched->tool.exit = perf_event__process_exit; + sched->tool.fork = perf_event__process_fork; + sched->tool.lost = process_lost; + sched->tool.attr = perf_event__process_attr; + sched->tool.tracing_data = perf_event__process_tracing_data; + sched->tool.build_id = perf_event__process_build_id; + + sched->tool.ordering_requires_timestamps = true; + + symbol_conf.use_callchain = sched->show_callchain; + + session = perf_session__new(&data, &sched->tool); + if (IS_ERR(session)) + return PTR_ERR(session); + + env = perf_session__env(session); + if (cpu_list) { + err = perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap); + if (err < 0) + goto out; + } + + evlist = session->evlist; + + symbol__init(env); + + if (perf_time__parse_str(&sched->ptime, sched->time_str) != 0) { + pr_err("Invalid time string\n"); + err = -EINVAL; + goto out; + } + + if (timehist_check_attr(sched, evlist) != 0) + goto out; + + if (timehist_parse_prio_str(sched) != 0) { + pr_err("Invalid prio string\n"); + goto out; + } + + setup_pager(); + + evsel__set_priv_destructor(timehist__evsel_priv_destructor); + + /* prefer sched_waking if it is captured */ + if (evlist__find_tracepoint_by_name(session->evlist, "sched:sched_waking")) + handlers[1].handler = timehist_sched_wakeup_ignore; + + /* setup per-evsel handlers */ + if (perf_session__set_tracepoints_handlers(session, handlers)) + goto out; + + /* sched_switch event at a minimum needs to exist */ + if (!evlist__find_tracepoint_by_name(session->evlist, "sched:sched_switch")) { + pr_err("No sched_switch events found. Have you run 'perf sched record'?\n"); + goto out; + } + + if ((sched->show_migrations || sched->pre_migrations) && + perf_session__set_tracepoints_handlers(session, migrate_handlers)) + goto out; + + /* pre-allocate struct for per-CPU idle stats; cap to array bounds */ + sched->max_cpu.cpu = min(env->nr_cpus_online, MAX_CPUS); + if (sched->max_cpu.cpu == 0) + sched->max_cpu.cpu = 4; + if (init_idle_threads(sched->max_cpu.cpu)) + goto out; + + /* summary_only implies summary option, but don't overwrite summary if set */ + if (sched->summary_only) + sched->summary = sched->summary_only; + + if (!sched->summary_only) + timehist_header(sched); + + err = perf_session__process_events(session); + if (err) { + pr_err("Failed to process events, error %d", err); + goto out; + } + + sched->nr_events = evlist__stats(evlist)->nr_events[0]; + sched->nr_lost_events = evlist__stats(evlist)->total_lost; + sched->nr_lost_chunks = evlist__stats(evlist)->nr_events[PERF_RECORD_LOST]; + + if (sched->summary) + timehist_print_summary(sched, session); + +out: + free_idle_threads(); + perf_session__delete(session); + + return err; +} + + +static void print_bad_events(struct perf_sched *sched) +{ + if (sched->nr_unordered_timestamps && sched->nr_timestamps) { + printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n", + (double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0, + sched->nr_unordered_timestamps, sched->nr_timestamps); + } + if (sched->nr_lost_events && sched->nr_events) { + printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n", + (double)sched->nr_lost_events/(double)sched->nr_events * 100.0, + sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks); + } + if (sched->nr_context_switch_bugs && sched->nr_timestamps) { + printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)", + (double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0, + sched->nr_context_switch_bugs, sched->nr_timestamps); + if (sched->nr_lost_events) + printf(" (due to lost events?)"); + printf("\n"); + } +} + +static void __merge_work_atoms(struct rb_root_cached *root, struct work_atoms *data) +{ + struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL; + struct work_atoms *this; + const char *comm = thread__comm_str(data->thread), *this_comm; + bool leftmost = true; + + while (*new) { + int cmp; + + this = container_of(*new, struct work_atoms, node); + parent = *new; + + this_comm = thread__comm_str(this->thread); + cmp = strcmp(comm, this_comm); + if (cmp > 0) { + new = &((*new)->rb_left); + } else if (cmp < 0) { + new = &((*new)->rb_right); + leftmost = false; + } else { + this->num_merged++; + this->total_runtime += data->total_runtime; + this->nb_atoms += data->nb_atoms; + this->total_lat += data->total_lat; + list_splice_init(&data->work_list, &this->work_list); + if (this->max_lat < data->max_lat) { + this->max_lat = data->max_lat; + this->max_lat_start = data->max_lat_start; + this->max_lat_end = data->max_lat_end; + } + for (int i = 0; i < NUM_LAT_BUCKETS; i++) + this->hist[i] += data->hist[i]; + free_work_atoms(data); + return; + } + } + + data->num_merged++; + rb_link_node(&data->node, parent, new); + rb_insert_color_cached(&data->node, root, leftmost); +} + +static void perf_sched__merge_lat(struct perf_sched *sched) +{ + struct work_atoms *data; + struct rb_node *node; + + if (sched->skip_merge) + return; + + while ((node = rb_first_cached(&sched->atom_root))) { + rb_erase_cached(node, &sched->atom_root); + data = rb_entry(node, struct work_atoms, node); + __merge_work_atoms(&sched->merged_atom_root, data); + } +} + +static int setup_cpus_switch_event(struct perf_sched *sched) +{ + unsigned int i; + + sched->cpu_last_switched = calloc(MAX_CPUS, sizeof(*(sched->cpu_last_switched))); + if (!sched->cpu_last_switched) + return -1; + + sched->curr_pid = calloc(MAX_CPUS, sizeof(*(sched->curr_pid))); + if (!sched->curr_pid) { + zfree(&sched->cpu_last_switched); + return -1; + } + + for (i = 0; i < MAX_CPUS; i++) + sched->curr_pid[i] = -1; + + return 0; +} + +static void free_cpus_switch_event(struct perf_sched *sched) +{ + zfree(&sched->curr_pid); + zfree(&sched->cpu_last_switched); +} + +static int perf_sched__lat(struct perf_sched *sched) +{ + int rc = -1; + struct rb_node *next; + char total_runtime_str[32]; + + setup_pager(); + + if (sched->hist_mode_str) { + sched->show_histogram = true; + if (!strcmp(sched->hist_mode_str, "linear")) + sched->hist_mode = HIST_MODE_LINEAR; + else if (!strcmp(sched->hist_mode_str, "log")) + sched->hist_mode = HIST_MODE_LOG; + else { + pr_err("Invalid --hist-mode '%s', expected 'log' or 'linear'\n", + sched->hist_mode_str); + return -EINVAL; + } + } + + if (sched->time_str && perf_time__parse_str(&sched->ptime, sched->time_str) != 0) { + pr_err("Invalid time string\n"); + return -EINVAL; + } + + if (setup_cpus_switch_event(sched)) + return rc; + + if (perf_sched__read_events(sched)) + goto out_free_cpus_switch_event; + + perf_sched__merge_lat(sched); + perf_sched__sort_lat(sched); + + next = rb_first_cached(&sched->sorted_atom_root); + while (next) { + struct work_atoms *work_list = rb_entry(next, struct work_atoms, node); + + if (work_list->nb_atoms && thread__tid(work_list->thread) != 0) + break; + next = rb_next(next); + } + + if (!next) { + pr_info("No matching trace samples found.\n"); + rc = 0; + goto out_free_atoms; + } + + printf("\n ------------------------------------------------------------------------------------------------------------------------------------------\n"); + printf(" Task | Runtime | Count | Avg delay | Max delay | Max delay start | Max delay end |\n"); + printf(" ------------------------------------------------------------------------------------------------------------------------------------------\n"); + + next = rb_first_cached(&sched->sorted_atom_root); + + while (next) { + struct work_atoms *work_list; + + work_list = rb_entry(next, struct work_atoms, node); + output_lat_thread(sched, work_list); + next = rb_next(next); + } + + printf(" ------------------------------------------------------------------------------------------------------------------------------------------\n"); + scnprintf_latency_unit(total_runtime_str, sizeof(total_runtime_str), sched->all_runtime); + printf(" TOTAL: |%15s |%9" PRIu64 " |\n", + total_runtime_str, sched->all_count); + + printf(" ------------------------------------------------------\n"); + + print_bad_events(sched); + printf("\n"); + + if (sched->show_histogram) + print_latency_histogram(sched, sched->global_hist, sched->all_count, + "CPU Wait Latency Distribution Histogram (between snapshots)"); + + rc = 0; + +out_free_atoms: + while ((next = rb_first_cached(&sched->sorted_atom_root))) { + struct work_atoms *data; + + data = rb_entry(next, struct work_atoms, node); + rb_erase_cached(next, &sched->sorted_atom_root); + free_work_atoms(data); + } +out_free_cpus_switch_event: + free_cpus_switch_event(sched); + return rc; +} + +static int setup_map_cpus(struct perf_sched *sched) +{ + if (sched->map.comp) { + sched->map.comp_cpus = calloc(MAX_CPUS, sizeof(*sched->map.comp_cpus)); + if (!sched->map.comp_cpus) + return -1; + } + + if (sched->map.cpus_str) { + sched->map.cpus = perf_cpu_map__new(sched->map.cpus_str); + if (!sched->map.cpus) { + pr_err("failed to get cpus map from %s\n", sched->map.cpus_str); + zfree(&sched->map.comp_cpus); + return -1; + } + } + + return 0; +} + +static int setup_color_pids(struct perf_sched *sched) +{ + struct perf_thread_map *map; + + if (!sched->map.color_pids_str) + return 0; + + map = thread_map__new_by_tid_str(sched->map.color_pids_str); + if (!map) { + pr_err("failed to get thread map from %s\n", sched->map.color_pids_str); + return -1; + } + + sched->map.color_pids = map; + return 0; +} + +static int setup_color_cpus(struct perf_sched *sched) +{ + struct perf_cpu_map *map; + + if (!sched->map.color_cpus_str) + return 0; + + map = perf_cpu_map__new(sched->map.color_cpus_str); + if (!map) { + pr_err("failed to get thread map from %s\n", sched->map.color_cpus_str); + return -1; + } + + sched->map.color_cpus = map; + return 0; +} + +static int perf_sched__map(struct perf_sched *sched) +{ + int rc = -1; + + sched->curr_thread = calloc(MAX_CPUS, sizeof(*(sched->curr_thread))); + if (!sched->curr_thread) + return rc; + + sched->curr_out_thread = calloc(MAX_CPUS, sizeof(*(sched->curr_out_thread))); + if (!sched->curr_out_thread) + goto out_free_curr_thread; + + if (setup_cpus_switch_event(sched)) + goto out_free_curr_out_thread; + + if (setup_map_cpus(sched)) + goto out_free_cpus_switch_event; + + if (setup_color_pids(sched)) + goto out_put_map_cpus; + + if (setup_color_cpus(sched)) + goto out_put_color_pids; + + setup_pager(); + if (perf_sched__read_events(sched)) + goto out_put_color_cpus; + + rc = 0; + print_bad_events(sched); + +out_put_color_cpus: + perf_cpu_map__put(sched->map.color_cpus); + +out_put_color_pids: + perf_thread_map__put(sched->map.color_pids); + +out_put_map_cpus: + zfree(&sched->map.comp_cpus); + perf_cpu_map__put(sched->map.cpus); + +out_free_cpus_switch_event: + free_cpus_switch_event(sched); + +out_free_curr_out_thread: + for (int i = 0; i < MAX_CPUS; i++) + thread__put(sched->curr_out_thread[i]); + zfree(&sched->curr_out_thread); + +out_free_curr_thread: + for (int i = 0; i < MAX_CPUS; i++) + thread__put(sched->curr_thread[i]); + zfree(&sched->curr_thread); + return rc; +} + +static int perf_sched__replay(struct perf_sched *sched) +{ + int ret; + unsigned long i; + + mutex_init(&sched->start_work_mutex); + mutex_init(&sched->work_done_wait_mutex); + + ret = setup_cpus_switch_event(sched); + if (ret) + goto out_mutex_destroy; + + calibrate_run_measurement_overhead(sched); + calibrate_sleep_measurement_overhead(sched); + + test_calibrations(sched); + + ret = perf_sched__read_events(sched); + if (ret) + goto out_free_cpus_switch_event; + + printf("nr_run_events: %ld\n", sched->nr_run_events); + printf("nr_sleep_events: %ld\n", sched->nr_sleep_events); + printf("nr_wakeup_events: %ld\n", sched->nr_wakeup_events); + + if (sched->targetless_wakeups) + printf("target-less wakeups: %ld\n", sched->targetless_wakeups); + if (sched->multitarget_wakeups) + printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups); + if (sched->nr_run_events_optimized) + printf("run atoms optimized: %ld\n", + sched->nr_run_events_optimized); + + print_task_traces(sched); + add_cross_task_wakeups(sched); + + sched->thread_funcs_exit = false; + create_tasks(sched); + printf("------------------------------------------------------------\n"); + if (sched->replay_repeat == 0) + sched->replay_repeat = UINT_MAX; + + for (i = 0; i < sched->replay_repeat; i++) + run_one_test(sched); + + sched->thread_funcs_exit = true; + destroy_tasks(sched); + +out_free_cpus_switch_event: + free_cpus_switch_event(sched); + +out_mutex_destroy: + mutex_destroy(&sched->start_work_mutex); + mutex_destroy(&sched->work_done_wait_mutex); + return ret; +} + +static void setup_sorting(struct perf_sched *sched, const struct option *options, + const char * const usage_msg[]) +{ + char *tmp, *tok, *str = strdup(sched->sort_order); + + for (tok = strtok_r(str, ", ", &tmp); + tok; tok = strtok_r(NULL, ", ", &tmp)) { + if (sort_dimension__add(tok, &sched->sort_list) < 0) { + usage_with_options_msg(usage_msg, options, + "Unknown --sort key: `%s'", tok); + } + } + + free(str); + + sort_dimension__add("pid", &sched->cmp_pid); +} + +static int process_synthesized_schedstat_event(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample __maybe_unused, + struct machine *machine __maybe_unused) +{ + struct perf_sched *sched = container_of(tool, struct perf_sched, tool); + + if (perf_data__write(sched->data, event, event->header.size) <= 0) { + pr_err("failed to write perf data, error: %m\n"); + return -1; + } + + sched->session->header.data_size += event->header.size; + return 0; +} + +static volatile sig_atomic_t done; + +static void sighandler(int sig __maybe_unused) +{ + done = 1; +} + +static int enable_sched_schedstats(int *reset) +{ + char path[PATH_MAX]; + FILE *fp; + char ch; + + snprintf(path, PATH_MAX, "%s/sys/kernel/sched_schedstats", procfs__mountpoint()); + fp = fopen(path, "w+"); + if (!fp) { + pr_err("Failed to open %s\n", path); + return -1; + } + + ch = getc(fp); + if (ch == '0') { + *reset = 1; + rewind(fp); + putc('1', fp); + fclose(fp); + } + return 0; +} + +static int disable_sched_schedstat(void) +{ + char path[PATH_MAX]; + FILE *fp; + + snprintf(path, PATH_MAX, "%s/sys/kernel/sched_schedstats", procfs__mountpoint()); + fp = fopen(path, "w"); + if (!fp) { + pr_err("Failed to open %s\n", path); + return -1; + } + + putc('0', fp); + fclose(fp); + return 0; +} + +/* perf.data or any other output file name used by stats subcommand (only). */ +const char *output_name; + +static int perf_sched__schedstat_record(struct perf_sched *sched, + int argc, const char **argv) +{ + struct perf_session *session; + struct target target = {}; + struct evlist *evlist; + int reset = 0; + int err = 0; + int fd; + struct perf_data data = { + .path = output_name, + .mode = PERF_DATA_MODE_WRITE, + }; + + done = 0; + signal(SIGINT, sighandler); + signal(SIGCHLD, sighandler); + signal(SIGTERM, sighandler); + + evlist = evlist__new(); + if (!evlist) + return -ENOMEM; + + session = perf_session__new(&data, &sched->tool); + if (IS_ERR(session)) { + pr_err("Perf session creation failed.\n"); + evlist__put(evlist); + return PTR_ERR(session); + } + + session->evlist = evlist; + + sched->session = session; + sched->data = &data; + + fd = perf_data__fd(&data); + + /* + * Capture all important metadata about the system. Although they are + * not used by `perf sched stats` tool directly, they provide useful + * information about profiled environment. + */ + perf_header__set_feat(&session->header, HEADER_HOSTNAME); + perf_header__set_feat(&session->header, HEADER_OSRELEASE); + perf_header__set_feat(&session->header, HEADER_VERSION); + perf_header__set_feat(&session->header, HEADER_ARCH); + perf_header__set_feat(&session->header, HEADER_NRCPUS); + perf_header__set_feat(&session->header, HEADER_CPUDESC); + perf_header__set_feat(&session->header, HEADER_CPUID); + perf_header__set_feat(&session->header, HEADER_TOTAL_MEM); + perf_header__set_feat(&session->header, HEADER_CMDLINE); + perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY); + perf_header__set_feat(&session->header, HEADER_NUMA_TOPOLOGY); + perf_header__set_feat(&session->header, HEADER_CACHE); + perf_header__set_feat(&session->header, HEADER_MEM_TOPOLOGY); + perf_header__set_feat(&session->header, HEADER_HYBRID_TOPOLOGY); + perf_header__set_feat(&session->header, HEADER_CPU_DOMAIN_INFO); + + err = perf_session__write_header(session, evlist, fd, false); + if (err < 0) + goto out; + + /* + * `perf sched stats` does not support workload profiling (-p pid) + * since /proc/schedstat file contains cpu specific data only. Hence, a + * profile target is either set of cpus or systemwide, never a process. + * Note that, although `-- ` is supported, profile data are + * still cpu/systemwide. + */ + if (cpu_list) + target.cpu_list = cpu_list; + else + target.system_wide = true; + + if (argc) { + err = evlist__prepare_workload(evlist, &target, argv, false, NULL); + if (err) + goto out; + } + + err = evlist__create_maps(evlist, &target); + if (err < 0) + goto out; + + user_requested_cpus = evlist__core(evlist)->user_requested_cpus; + + err = perf_event__synthesize_schedstat(&(sched->tool), + process_synthesized_schedstat_event, + user_requested_cpus); + if (err < 0) + goto out; + + err = enable_sched_schedstats(&reset); + if (err < 0) + goto out; + + if (argc) + evlist__start_workload(evlist); + + while (!done) { + if (argc && waitpid(evlist__workload_pid(evlist), NULL, WNOHANG) > 0) + break; + sleep(1); + } + + if (reset) { + err = disable_sched_schedstat(); + if (err < 0) + goto out; + } + + err = perf_event__synthesize_schedstat(&(sched->tool), + process_synthesized_schedstat_event, + user_requested_cpus); + if (err < 0) + goto out; + + err = perf_session__write_header(session, evlist, fd, true); + +out: + if (!err) + fprintf(stderr, "[ perf sched stats: Wrote samples to %s ]\n", data.path); + else + fprintf(stderr, "[ perf sched stats: Failed !! ]\n"); + + perf_session__delete(session); + evlist__put(evlist); + return err; +} + +struct schedstat_domain { + struct list_head domain_list; + struct perf_record_schedstat_domain *domain_data; +}; + +struct schedstat_cpu { + struct list_head cpu_list; + struct list_head domain_head; + struct perf_record_schedstat_cpu *cpu_data; +}; + +static struct list_head cpu_head = LIST_HEAD_INIT(cpu_head); +static struct schedstat_cpu *cpu_second_pass; +static struct schedstat_domain *domain_second_pass; +static bool after_workload_flag; +static bool verbose_field; + +static void free_schedstat(struct list_head *head); + +static void store_schedstat_cpu_diff(struct schedstat_cpu *after_workload) +{ + struct perf_record_schedstat_cpu *before = cpu_second_pass->cpu_data; + struct perf_record_schedstat_cpu *after = after_workload->cpu_data; + __u16 version = after_workload->cpu_data->version; + +#define CPU_FIELD(_type, _name, _desc, _format, _is_pct, _pct_of, _ver) \ + (before->_ver._name = after->_ver._name - before->_ver._name) + + if (version == 15) { +#include + } else if (version == 16) { +#include + } else if (version == 17) { +#include + } + +#undef CPU_FIELD +} + +static void store_schedstat_domain_diff(struct schedstat_domain *after_workload) +{ + struct perf_record_schedstat_domain *before = domain_second_pass->domain_data; + struct perf_record_schedstat_domain *after = after_workload->domain_data; + __u16 version = after_workload->domain_data->version; + +#define DOMAIN_FIELD(_type, _name, _desc, _format, _is_jiffies, _ver) \ + (before->_ver._name = after->_ver._name - before->_ver._name) + + if (version == 15) { +#include + } else if (version == 16) { +#include + } else if (version == 17) { +#include + } +#undef DOMAIN_FIELD +} + +#define PCT_CHNG(_x, _y) ((_x) ? ((double)((double)(_y) - (_x)) / (_x)) * 100 : 0.0) +static inline void print_cpu_stats(struct perf_record_schedstat_cpu *cs1, + struct perf_record_schedstat_cpu *cs2) +{ + printf("%-65s ", "DESC"); + if (!cs2) + printf("%12s %12s", "COUNT", "PCT_CHANGE"); + else + printf("%12s %11s %12s %14s %10s", "COUNT1", "COUNT2", "PCT_CHANGE", + "PCT_CHANGE1", "PCT_CHANGE2"); + + printf("\n"); + print_separator2(SEP_LEN, "", 0); + +#define CALC_PCT(_x, _y) ((_y) ? ((double)(_x) / (_y)) * 100 : 0.0) + +#define CPU_FIELD(_type, _name, _desc, _format, _is_pct, _pct_of, _ver) \ + do { \ + printf("%-65s: " _format, verbose_field ? _desc : #_name, \ + cs1->_ver._name); \ + if (!cs2) { \ + if (_is_pct) \ + printf(" ( %8.2lf%% )", \ + CALC_PCT(cs1->_ver._name, cs1->_ver._pct_of)); \ + } else { \ + printf("," _format " | %8.2lf%% |", cs2->_ver._name, \ + PCT_CHNG(cs1->_ver._name, cs2->_ver._name)); \ + if (_is_pct) \ + printf(" ( %8.2lf%%, %8.2lf%% )", \ + CALC_PCT(cs1->_ver._name, cs1->_ver._pct_of), \ + CALC_PCT(cs2->_ver._name, cs2->_ver._pct_of)); \ + } \ + printf("\n"); \ + } while (0) + + if (cs1->version == 15) { +#include + } else if (cs1->version == 16) { +#include + } else if (cs1->version == 17) { +#include + } + +#undef CPU_FIELD +#undef CALC_PCT +} + +static inline void print_domain_stats(struct perf_record_schedstat_domain *ds1, + struct perf_record_schedstat_domain *ds2, + __u64 jiffies1, __u64 jiffies2) +{ + printf("%-65s ", "DESC"); + if (!ds2) + printf("%12s %14s", "COUNT", "AVG_JIFFIES"); + else + printf("%12s %11s %12s %16s %12s", "COUNT1", "COUNT2", "PCT_CHANGE", + "AVG_JIFFIES1", "AVG_JIFFIES2"); + printf("\n"); + +#define DOMAIN_CATEGORY(_desc) \ + do { \ + size_t _len = strlen(_desc); \ + size_t _pre_dash_cnt = (SEP_LEN - _len) / 2; \ + size_t _post_dash_cnt = SEP_LEN - _len - _pre_dash_cnt; \ + print_separator2((int)_pre_dash_cnt, _desc, (int)_post_dash_cnt);\ + } while (0) + +#define CALC_AVG(_x, _y) ((_y) ? (long double)(_x) / (_y) : 0.0) + +#define DOMAIN_FIELD(_type, _name, _desc, _format, _is_jiffies, _ver) \ + do { \ + printf("%-65s: " _format, verbose_field ? _desc : #_name, \ + ds1->_ver._name); \ + if (!ds2) { \ + if (_is_jiffies) \ + printf(" $ %11.2Lf $", \ + CALC_AVG(jiffies1, ds1->_ver._name)); \ + } else { \ + printf("," _format " | %8.2lf%% |", ds2->_ver._name, \ + PCT_CHNG(ds1->_ver._name, ds2->_ver._name)); \ + if (_is_jiffies) \ + printf(" $ %11.2Lf, %11.2Lf $", \ + CALC_AVG(jiffies1, ds1->_ver._name), \ + CALC_AVG(jiffies2, ds2->_ver._name)); \ + } \ + printf("\n"); \ + } while (0) + +#define DERIVED_CNT_FIELD(_name, _desc, _format, _x, _y, _z, _ver) \ + do { \ + __u32 t1 = ds1->_ver._x - ds1->_ver._y - ds1->_ver._z; \ + printf("*%-64s: " _format, verbose_field ? _desc : #_name, t1); \ + if (ds2) { \ + __u32 t2 = ds2->_ver._x - ds2->_ver._y - ds2->_ver._z; \ + printf("," _format " | %8.2lf%% |", t2, \ + PCT_CHNG(t1, t2)); \ + } \ + printf("\n"); \ + } while (0) + +#define DERIVED_AVG_FIELD(_name, _desc, _format, _x, _y, _z, _w, _ver) \ + do { \ + __u32 t1 = ds1->_ver._x - ds1->_ver._y - ds1->_ver._z; \ + printf("*%-64s: " _format, verbose_field ? _desc : #_name, \ + CALC_AVG(ds1->_ver._w, t1)); \ + if (ds2) { \ + __u32 t2 = ds2->_ver._x - ds2->_ver._y - ds2->_ver._z; \ + printf("," _format " | %8.2Lf%% |", \ + CALC_AVG(ds2->_ver._w, t2), \ + PCT_CHNG(CALC_AVG(ds1->_ver._w, t1), \ + CALC_AVG(ds2->_ver._w, t2))); \ + } \ + printf("\n"); \ + } while (0) + + if (ds1->version == 15) { +#include + } else if (ds1->version == 16) { +#include + } else if (ds1->version == 17) { +#include + } + +#undef DERIVED_AVG_FIELD +#undef DERIVED_CNT_FIELD +#undef DOMAIN_FIELD +#undef CALC_AVG +#undef DOMAIN_CATEGORY +} +#undef PCT_CHNG + +static void summarize_schedstat_cpu(struct schedstat_cpu *summary_cpu, + struct schedstat_cpu *cptr, + int cnt, bool is_last) +{ + struct perf_record_schedstat_cpu *summary_cs = summary_cpu->cpu_data, + *temp_cs = cptr->cpu_data; + +#define CPU_FIELD(_type, _name, _desc, _format, _is_pct, _pct_of, _ver) \ + do { \ + summary_cs->_ver._name += temp_cs->_ver._name; \ + if (is_last) \ + summary_cs->_ver._name /= cnt; \ + } while (0) + + if (cptr->cpu_data->version == 15) { +#include + } else if (cptr->cpu_data->version == 16) { +#include + } else if (cptr->cpu_data->version == 17) { +#include + } +#undef CPU_FIELD +} + +static void summarize_schedstat_domain(struct schedstat_domain *summary_domain, + struct schedstat_domain *dptr, + int cnt, bool is_last) +{ + struct perf_record_schedstat_domain *summary_ds = summary_domain->domain_data, + *temp_ds = dptr->domain_data; + +#define DOMAIN_FIELD(_type, _name, _desc, _format, _is_jiffies, _ver) \ + do { \ + summary_ds->_ver._name += temp_ds->_ver._name; \ + if (is_last) \ + summary_ds->_ver._name /= cnt; \ + } while (0) + + if (dptr->domain_data->version == 15) { +#include + } else if (dptr->domain_data->version == 16) { +#include + } else if (dptr->domain_data->version == 17) { +#include + } +#undef DOMAIN_FIELD +} + +/* + * get_all_cpu_stats() appends the summary to the head of the list. + */ +static int get_all_cpu_stats(struct list_head *head) +{ + struct schedstat_cpu *cptr, *summary_head = NULL; + struct schedstat_domain *dptr, *tdptr; + bool is_last = false; + int cnt = 1; + int ret = 0; + struct list_head tmp_cleanup_list; + + assert(!list_empty(head)); + cptr = list_first_entry(head, struct schedstat_cpu, cpu_list); + + INIT_LIST_HEAD(&tmp_cleanup_list); + + summary_head = zalloc(sizeof(*summary_head)); + if (!summary_head) + return -ENOMEM; + + INIT_LIST_HEAD(&summary_head->domain_head); + INIT_LIST_HEAD(&summary_head->cpu_list); + list_add(&summary_head->cpu_list, &tmp_cleanup_list); + + summary_head->cpu_data = zalloc(sizeof(*summary_head->cpu_data)); + if (!summary_head->cpu_data) { + ret = -ENOMEM; + goto out_cleanup; + } + memcpy(summary_head->cpu_data, cptr->cpu_data, sizeof(*summary_head->cpu_data)); + + list_for_each_entry(dptr, &cptr->domain_head, domain_list) { + tdptr = zalloc(sizeof(*tdptr)); + if (!tdptr) { + ret = -ENOMEM; + goto out_cleanup; + } + INIT_LIST_HEAD(&tdptr->domain_list); + + tdptr->domain_data = zalloc(sizeof(*tdptr->domain_data)); + if (!tdptr->domain_data) { + free(tdptr); + ret = -ENOMEM; + goto out_cleanup; + } + + memcpy(tdptr->domain_data, dptr->domain_data, sizeof(*tdptr->domain_data)); + list_add_tail(&tdptr->domain_list, &summary_head->domain_head); + } + + list_for_each_entry(cptr, head, cpu_list) { + if (list_is_first(&cptr->cpu_list, head)) + continue; + + if (list_is_last(&cptr->cpu_list, head)) + is_last = true; + + cnt++; + summarize_schedstat_cpu(summary_head, cptr, cnt, is_last); + if (list_empty(&summary_head->domain_head)) + continue; + + tdptr = list_first_entry(&summary_head->domain_head, struct schedstat_domain, + domain_list); + + list_for_each_entry(dptr, &cptr->domain_head, domain_list) { + summarize_schedstat_domain(tdptr, dptr, cnt, is_last); + if (list_is_last(&tdptr->domain_list, &summary_head->domain_head)) { + tdptr = NULL; + break; + } + tdptr = list_next_entry(tdptr, domain_list); + } + } + + list_del_init(&summary_head->cpu_list); + list_add(&summary_head->cpu_list, head); + return 0; + +out_cleanup: + free_schedstat(&tmp_cleanup_list); + return ret; +} + +static int show_schedstat_data(struct list_head *head1, struct cpu_domain_map **cd_map1, int nr1, + struct list_head *head2, struct cpu_domain_map **cd_map2, int nr2, + bool summary_only) +{ + struct schedstat_cpu *cptr1 = list_first_entry(head1, struct schedstat_cpu, cpu_list); + struct perf_record_schedstat_domain *ds1 = NULL, *ds2 = NULL; + struct schedstat_domain *dptr1 = NULL, *dptr2 = NULL; + struct schedstat_cpu *cptr2 = NULL; + __u64 jiffies1 = 0, jiffies2 = 0; + bool is_summary = true; + int ret = 0; + + if (!cd_map1) { + pr_err("Error: CPU domain map 1 is missing.\n"); + return -1; + } + if (head2 && !cd_map2) { + pr_err("Error: CPU domain map 2 is missing.\n"); + return -1; + } + + printf("Description\n"); + print_separator2(SEP_LEN, "", 0); + printf("%-30s-> %s\n", "DESC", "Description of the field"); + printf("%-30s-> %s\n", "COUNT", "Value of the field"); + printf("%-30s-> %s\n", "PCT_CHANGE", "Percent change with corresponding base value"); + printf("%-30s-> %s\n", "AVG_JIFFIES", + "Avg time in jiffies between two consecutive occurrence of event"); + + print_separator2(SEP_LEN, "", 0); + printf("\n"); + + printf("%-65s: ", "Time elapsed (in jiffies)"); + jiffies1 = cptr1->cpu_data->timestamp; + printf("%11llu", jiffies1); + if (head2) { + cptr2 = list_first_entry(head2, struct schedstat_cpu, cpu_list); + jiffies2 = cptr2->cpu_data->timestamp; + printf(",%11llu", jiffies2); + } + printf("\n"); + + ret = get_all_cpu_stats(head1); + if (ret) + return ret; + if (cptr2) { + ret = get_all_cpu_stats(head2); + if (ret) + return ret; + cptr2 = list_first_entry(head2, struct schedstat_cpu, cpu_list); + } + + list_for_each_entry(cptr1, head1, cpu_list) { + struct cpu_domain_map *cd_info1 = NULL, *cd_info2 = NULL; + struct perf_record_schedstat_cpu *cs1 = cptr1->cpu_data; + struct perf_record_schedstat_cpu *cs2 = NULL; + + dptr2 = NULL; + if (cs1->cpu >= (u32)nr1) { + pr_err("Error: CPU %d exceeds domain map size %d\n", cs1->cpu, nr1); + return -1; + } + cd_info1 = cd_map1[cs1->cpu]; + if (!cd_info1) { + pr_err("Error: CPU %d domain info is missing in map 1.\n", + cs1->cpu); + return -1; + } + if (cptr2) { + cs2 = cptr2->cpu_data; + if (cs2->cpu >= (u32)nr2) { + pr_err("Error: CPU %d exceeds domain map size %d\n", cs2->cpu, nr2); + return -1; + } + cd_info2 = cd_map2[cs2->cpu]; + if (!cd_info2) { + pr_err("Error: CPU %d domain info is missing in map 2.\n", + cs2->cpu); + return -1; + } + if (!list_empty(&cptr2->domain_head)) + dptr2 = list_first_entry(&cptr2->domain_head, + struct schedstat_domain, + domain_list); + } + + if (cs2 && cs1->cpu != cs2->cpu) { + pr_err("Failed because matching cpus not found for diff\n"); + return -1; + } + + if (cd_info2 && cd_info1->nr_domains != cd_info2->nr_domains) { + pr_err("Failed because nr_domains is not same for cpus\n"); + return -1; + } + + print_separator2(SEP_LEN, "", 0); + + if (is_summary) + printf("CPU: \n"); + else + printf("CPU: %d\n", cs1->cpu); + + print_separator2(SEP_LEN, "", 0); + print_cpu_stats(cs1, cs2); + print_separator2(SEP_LEN, "", 0); + + list_for_each_entry(dptr1, &cptr1->domain_head, domain_list) { + struct domain_info *dinfo1 = NULL, *dinfo2 = NULL; + + ds1 = dptr1->domain_data; + ds2 = NULL; + if (ds1->domain >= cd_info1->nr_domains) { + pr_err("Error: Domain %d exceeds max domains %d for CPU %d in map 1.\n", + ds1->domain, cd_info1->nr_domains, cs1->cpu); + return -1; + } + dinfo1 = cd_info1->domains[ds1->domain]; + if (!dinfo1) { + pr_err("Error: Domain %d info is missing for CPU %d in map 1.\n", + ds1->domain, cs1->cpu); + return -1; + } + if (dptr2) { + ds2 = dptr2->domain_data; + if (ds2->domain >= cd_info2->nr_domains) { + pr_err("Error: Domain %d exceeds max domains %d for CPU %d in map 2.\n", + ds2->domain, cd_info2->nr_domains, cs2->cpu); + return -1; + } + dinfo2 = cd_info2->domains[ds2->domain]; + if (!dinfo2) { + pr_err("Error: Domain %d info is missing for CPU %d in map 2.\n", + ds2->domain, cs2->cpu); + return -1; + } + } + + if (dinfo2 && dinfo1->domain != dinfo2->domain) { + pr_err("Failed because matching domain not found for diff\n"); + return -1; + } + + if (is_summary) { + if (dinfo1->dname) + printf("CPU: | DOMAIN: %s\n", + dinfo1->dname); + else + printf("CPU: | DOMAIN: %d\n", + dinfo1->domain); + } else { + if (dinfo1->dname) + printf("CPU: %d | DOMAIN: %s | DOMAIN_CPUS: ", + cs1->cpu, dinfo1->dname); + else + printf("CPU: %d | DOMAIN: %d | DOMAIN_CPUS: ", + cs1->cpu, dinfo1->domain); + + printf("%s\n", dinfo1->cpulist); + } + print_separator2(SEP_LEN, "", 0); + print_domain_stats(ds1, ds2, jiffies1, jiffies2); + print_separator2(SEP_LEN, "", 0); + + if (dptr2) { + if (list_is_last(&dptr2->domain_list, &cptr2->domain_head)) + dptr2 = NULL; + else + dptr2 = list_next_entry(dptr2, domain_list); + } + } + if (summary_only) + break; + + if (cptr2) { + if (list_is_last(&cptr2->cpu_list, head2)) + cptr2 = NULL; + else + cptr2 = list_next_entry(cptr2, cpu_list); + } + + is_summary = false; + } + return ret; +} + +/* + * Creates a linked list of cpu_data and domain_data. Below represents the structure of the linked + * list where CPU0,CPU1,CPU2, ..., CPU(N-1) stores the cpu_data. Here N is the total number of cpus. + * Each of the CPU points to the list of domain_data. Here DOMAIN0, DOMAIN1, DOMAIN2, ... represents + * the domain_data. Here D0, D1, D2, ..., Dm are the number of domains in the respective cpus. + * + * +----------+ + * | CPU_HEAD | + * +----------+ + * | + * v + * +----------+ +---------+ +---------+ +---------+ +--------------+ + * | CPU0 | -> | DOMAIN0 | -> | DOMAIN1 | -> | DOMAIN2 | -> ... -> | DOMAIN(D0-1) | + * +----------+ +---------+ +---------+ +---------+ +--------------+ + * | + * v + * +----------+ +---------+ +---------+ +---------+ +--------------+ + * | CPU1 | -> | DOMAIN0 | -> | DOMAIN1 | -> | DOMAIN2 | -> ... -> | DOMAIN(D1-1) | + * +----------+ +---------+ +---------+ +---------+ +--------------+ + * | + * v + * +----------+ +---------+ +---------+ +---------+ +--------------+ + * | CPU2 | -> | DOMAIN0 | -> | DOMAIN1 | -> | DOMAIN2 | -> ... -> | DOMAIN(D2-1) | + * +----------+ +---------+ +---------+ +---------+ +--------------+ + * | + * v + * ... + * | + * v + * +----------+ +---------+ +---------+ +---------+ +--------------+ + * | CPU(N-1) | -> | DOMAIN0 | -> | DOMAIN1 | -> | DOMAIN2 | -> ... -> | DOMAIN(Dm-1) | + * +----------+ +---------+ +---------+ +---------+ +--------------+ + * + * Each cpu as well as domain has 2 enties in the event list one before the workload starts and + * other after completion of the workload. The above linked list stores the diff of the cpu and + * domain statistics. + */ +static int perf_sched__process_schedstat(const struct perf_tool *tool __maybe_unused, + struct perf_session *session __maybe_unused, + union perf_event *event) +{ + struct perf_cpu this_cpu; + static __u32 initial_cpu; + + switch (event->header.type) { + case PERF_RECORD_SCHEDSTAT_CPU: + this_cpu.cpu = event->schedstat_cpu.cpu; + break; + case PERF_RECORD_SCHEDSTAT_DOMAIN: + this_cpu.cpu = event->schedstat_domain.cpu; + break; + default: + return 0; + } + + if (user_requested_cpus && !perf_cpu_map__has(user_requested_cpus, this_cpu)) + return 0; + + if (event->header.type == PERF_RECORD_SCHEDSTAT_CPU) { + struct schedstat_cpu *temp = zalloc(sizeof(*temp)); + + if (!temp) + return -ENOMEM; + + temp->cpu_data = zalloc(sizeof(*temp->cpu_data)); + if (!temp->cpu_data) + return -ENOMEM; + + memcpy(temp->cpu_data, &event->schedstat_cpu, sizeof(*temp->cpu_data)); + + if (!list_empty(&cpu_head) && temp->cpu_data->cpu == initial_cpu) + after_workload_flag = true; + + if (!after_workload_flag) { + if (list_empty(&cpu_head)) + initial_cpu = temp->cpu_data->cpu; + + list_add_tail(&temp->cpu_list, &cpu_head); + INIT_LIST_HEAD(&temp->domain_head); + } else { + if (temp->cpu_data->cpu == initial_cpu) { + cpu_second_pass = list_first_entry(&cpu_head, struct schedstat_cpu, + cpu_list); + cpu_second_pass->cpu_data->timestamp = + temp->cpu_data->timestamp - cpu_second_pass->cpu_data->timestamp; + } else { + cpu_second_pass = list_next_entry(cpu_second_pass, cpu_list); + } + domain_second_pass = list_first_entry(&cpu_second_pass->domain_head, + struct schedstat_domain, domain_list); + store_schedstat_cpu_diff(temp); + free(temp->cpu_data); + free(temp); + } + } else if (event->header.type == PERF_RECORD_SCHEDSTAT_DOMAIN) { + struct schedstat_cpu *cpu_tail; + struct schedstat_domain *temp = zalloc(sizeof(*temp)); + + if (!temp) + return -ENOMEM; + + temp->domain_data = zalloc(sizeof(*temp->domain_data)); + if (!temp->domain_data) + return -ENOMEM; + + memcpy(temp->domain_data, &event->schedstat_domain, sizeof(*temp->domain_data)); + + if (!after_workload_flag) { + cpu_tail = list_last_entry(&cpu_head, struct schedstat_cpu, cpu_list); + list_add_tail(&temp->domain_list, &cpu_tail->domain_head); + } else { + store_schedstat_domain_diff(temp); + domain_second_pass = list_next_entry(domain_second_pass, domain_list); + free(temp->domain_data); + free(temp); + } + } + + return 0; +} + +static void free_schedstat(struct list_head *head) +{ + struct schedstat_domain *dptr, *n1; + struct schedstat_cpu *cptr, *n2; + + list_for_each_entry_safe(cptr, n2, head, cpu_list) { + list_for_each_entry_safe(dptr, n1, &cptr->domain_head, domain_list) { + list_del_init(&dptr->domain_list); + free(dptr->domain_data); + free(dptr); + } + list_del_init(&cptr->cpu_list); + free(cptr->cpu_data); + free(cptr); + } +} + +static int perf_sched__schedstat_report(struct perf_sched *sched) +{ + struct cpu_domain_map **cd_map; + struct perf_session *session; + struct target target = {}; + struct perf_data data = { + .path = input_name, + .mode = PERF_DATA_MODE_READ, + }; + int err = 0; + + sched->tool.schedstat_cpu = perf_sched__process_schedstat; + sched->tool.schedstat_domain = perf_sched__process_schedstat; + + session = perf_session__new(&data, &sched->tool); + if (IS_ERR(session)) { + pr_err("Perf session creation failed.\n"); + return PTR_ERR(session); + } + + if (cpu_list) + target.cpu_list = cpu_list; + else + target.system_wide = true; + + err = evlist__create_maps(session->evlist, &target); + if (err < 0) + goto out; + + user_requested_cpus = evlist__core(session->evlist)->user_requested_cpus; + + err = perf_session__process_events(session); + + if (!err) { + setup_pager(); + + if (list_empty(&cpu_head)) { + pr_err("Data is not available\n"); + err = -1; + goto out; + } + + cd_map = session->header.env.cpu_domain; + err = show_schedstat_data(&cpu_head, cd_map, + session->header.env.nr_cpus_avail, + NULL, NULL, 0, false); + } + +out: + free_schedstat(&cpu_head); + perf_session__delete(session); + return err; +} + +static int perf_sched__schedstat_diff(struct perf_sched *sched, + int argc, const char **argv) +{ + struct cpu_domain_map **cd_map0 = NULL, **cd_map1 = NULL; + struct list_head cpu_head_ses0, cpu_head_ses1; + struct perf_session *session[2]; + struct perf_data data[2] = {0}; + int ret = 0, err = 0; + static const char *defaults[] = { + "perf.data.old", + "perf.data", + }; + + if (argc) { + if (argc == 1) + defaults[1] = argv[0]; + else if (argc == 2) { + defaults[0] = argv[0]; + defaults[1] = argv[1]; + } else { + pr_err("perf sched stats diff is not supported with more than 2 files.\n"); + goto out_ret; + } + } + + INIT_LIST_HEAD(&cpu_head_ses0); + INIT_LIST_HEAD(&cpu_head_ses1); + + sched->tool.schedstat_cpu = perf_sched__process_schedstat; + sched->tool.schedstat_domain = perf_sched__process_schedstat; + + data[0].path = defaults[0]; + data[0].mode = PERF_DATA_MODE_READ; + session[0] = perf_session__new(&data[0], &sched->tool); + if (IS_ERR(session[0])) { + ret = PTR_ERR(session[0]); + pr_err("Failed to open %s\n", data[0].path); + goto out_delete_ses0; + } + + err = perf_session__process_events(session[0]); + if (err) { + free_schedstat(&cpu_head); + goto out_delete_ses0; + } + + cd_map0 = session[0]->header.env.cpu_domain; + list_replace_init(&cpu_head, &cpu_head_ses0); + after_workload_flag = false; + + data[1].path = defaults[1]; + data[1].mode = PERF_DATA_MODE_READ; + session[1] = perf_session__new(&data[1], &sched->tool); + if (IS_ERR(session[1])) { + ret = PTR_ERR(session[1]); + pr_err("Failed to open %s\n", data[1].path); + goto out_delete_ses1; + } + + err = perf_session__process_events(session[1]); + if (err) { + free_schedstat(&cpu_head); + goto out_delete_ses1; + } + + cd_map1 = session[1]->header.env.cpu_domain; + list_replace_init(&cpu_head, &cpu_head_ses1); + after_workload_flag = false; + setup_pager(); + + if (list_empty(&cpu_head_ses1)) { + pr_err("Data is not available\n"); + ret = -1; + goto out_delete_ses1; + } + + if (list_empty(&cpu_head_ses0)) { + pr_err("Data is not available\n"); + ret = -1; + goto out_delete_ses1; + } + + ret = show_schedstat_data(&cpu_head_ses0, cd_map0, session[0]->header.env.nr_cpus_avail, + &cpu_head_ses1, cd_map1, session[1]->header.env.nr_cpus_avail, true); + if (ret) + goto out_delete_ses1; + +out_delete_ses1: + free_schedstat(&cpu_head_ses1); + if (!IS_ERR(session[1])) + perf_session__delete(session[1]); + +out_delete_ses0: + free_schedstat(&cpu_head_ses0); + if (!IS_ERR(session[0])) + perf_session__delete(session[0]); + +out_ret: + return ret; +} + +static int process_synthesized_event_live(const struct perf_tool *tool __maybe_unused, + union perf_event *event, + struct perf_sample *sample __maybe_unused, + struct machine *machine __maybe_unused) +{ + return perf_sched__process_schedstat(tool, NULL, event); +} + +static int perf_sched__schedstat_live(struct perf_sched *sched, + int argc, const char **argv) +{ + struct cpu_domain_map **cd_map = NULL; + struct target target = {}; + u32 __maybe_unused md; + struct evlist *evlist; + u32 nr = 0, sv; + int reset = 0; + int err = 0; + + done = 0; + signal(SIGINT, sighandler); + signal(SIGCHLD, sighandler); + signal(SIGTERM, sighandler); + + evlist = evlist__new(); + if (!evlist) + return -ENOMEM; + + /* + * `perf sched schedstat` does not support workload profiling (-p pid) + * since /proc/schedstat file contains cpu specific data only. Hence, a + * profile target is either set of cpus or systemwide, never a process. + * Note that, although `-- ` is supported, profile data are + * still cpu/systemwide. + */ + if (cpu_list) + target.cpu_list = cpu_list; + else + target.system_wide = true; + + if (argc) { + err = evlist__prepare_workload(evlist, &target, argv, false, NULL); + if (err) + goto out; + } + + err = evlist__create_maps(evlist, &target); + if (err < 0) + goto out; + + user_requested_cpus = evlist__core(evlist)->user_requested_cpus; + + err = perf_event__synthesize_schedstat(&(sched->tool), + process_synthesized_event_live, + user_requested_cpus); + if (err < 0) + goto out; + + err = enable_sched_schedstats(&reset); + if (err < 0) + goto out; + + if (argc) + evlist__start_workload(evlist); + + while (!done) { + if (argc && waitpid(evlist__workload_pid(evlist), NULL, WNOHANG) > 0) + break; + sleep(1); + } + + if (reset) { + err = disable_sched_schedstat(); + if (err < 0) + goto out; + } + + err = perf_event__synthesize_schedstat(&(sched->tool), + process_synthesized_event_live, + user_requested_cpus); + if (err) + goto out; + + setup_pager(); + + if (list_empty(&cpu_head)) { + pr_err("Data is not available\n"); + err = -1; + goto out; + } + + nr = cpu__max_present_cpu().cpu; + cd_map = build_cpu_domain_map(&sv, &md, nr); + if (!cd_map) { + pr_err("Unable to generate cpu-domain relation info"); + goto out; + } + + err = show_schedstat_data(&cpu_head, cd_map, nr, NULL, NULL, 0, false); + free_cpu_domain_info(cd_map, sv, nr); +out: + free_schedstat(&cpu_head); + evlist__put(evlist); + return err; +} + +static bool schedstat_events_exposed(void) +{ + /* + * Select "sched:sched_stat_wait" event to check + * whether schedstat tracepoints are exposed. + */ + return IS_ERR(trace_event__tp_format("sched", "sched_stat_wait")) ? + false : true; +} + +static int __cmd_record(int argc, const char **argv) +{ + unsigned int rec_argc, i, j; + char **rec_argv; + const char **rec_argv_copy; + const char * const record_args[] = { + "record", + "-a", + "-R", + "-m", "1024", + "-c", "1", + "-e", "sched:sched_switch", + "-e", "sched:sched_stat_runtime", + "-e", "sched:sched_process_fork", + "-e", "sched:sched_wakeup_new", + "-e", "sched:sched_migrate_task", + }; + + /* + * The tracepoints trace_sched_stat_{wait, sleep, iowait} + * are not exposed to user if CONFIG_SCHEDSTATS is not set, + * to prevent "perf sched record" execution failure, determine + * whether to record schedstat events according to actual situation. + */ + const char * const schedstat_args[] = { + "-e", "sched:sched_stat_wait", + "-e", "sched:sched_stat_sleep", + "-e", "sched:sched_stat_iowait", + }; + unsigned int schedstat_argc = schedstat_events_exposed() ? + ARRAY_SIZE(schedstat_args) : 0; + + struct tep_event *waking_event; + int ret; + + /* + * +2 for either "-e", "sched:sched_wakeup" or + * "-e", "sched:sched_waking" + */ + rec_argc = ARRAY_SIZE(record_args) + 2 + schedstat_argc + argc - 1; + rec_argv = calloc(rec_argc + 1, sizeof(char *)); + if (rec_argv == NULL) + return -ENOMEM; + rec_argv_copy = calloc(rec_argc + 1, sizeof(char *)); + if (rec_argv_copy == NULL) { + free(rec_argv); + return -ENOMEM; + } + + for (i = 0; i < ARRAY_SIZE(record_args); i++) + rec_argv[i] = strdup(record_args[i]); + + rec_argv[i++] = strdup("-e"); + waking_event = trace_event__tp_format("sched", "sched_waking"); + if (!IS_ERR(waking_event)) + rec_argv[i++] = strdup("sched:sched_waking"); + else + rec_argv[i++] = strdup("sched:sched_wakeup"); + + for (j = 0; j < schedstat_argc; j++) + rec_argv[i++] = strdup(schedstat_args[j]); + + for (j = 1; j < (unsigned int)argc; j++, i++) + rec_argv[i] = strdup(argv[j]); + + BUG_ON(i != rec_argc); + + memcpy(rec_argv_copy, rec_argv, sizeof(char *) * rec_argc); + ret = cmd_record(rec_argc, rec_argv_copy); + + for (i = 0; i < rec_argc; i++) + free(rec_argv[i]); + free(rec_argv); + free(rec_argv_copy); + + return ret; +} + +int cmd_sched(int argc, const char **argv) +{ + static const char default_sort_order[] = "avg, max, switch, runtime"; + struct perf_sched sched = { + .cmp_pid = LIST_HEAD_INIT(sched.cmp_pid), + .sort_list = LIST_HEAD_INIT(sched.sort_list), + .sort_order = default_sort_order, + .replay_repeat = 10, + .profile_cpu = -1, + .next_shortname1 = 'A', + .next_shortname2 = '0', + .skip_merge = 0, + .show_callchain = 1, + .max_stack = 5, + }; + const struct option sched_options[] = { + OPT_STRING('i', "input", &input_name, "file", + "input file name"), + OPT_INCR('v', "verbose", &verbose, + "be more verbose (show symbol address, etc)"), + OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, + "dump raw trace in ASCII"), + OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"), + OPT_END() + }; + const struct option latency_options[] = { + OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]", + "sort by key(s): runtime, switch, avg, max"), + OPT_INTEGER('C', "CPU", &sched.profile_cpu, + "CPU to profile on"), + OPT_BOOLEAN('p', "pids", &sched.skip_merge, + "latency stats per pid instead of per comm"), + OPT_BOOLEAN('H', "histogram", &sched.show_histogram, + "show CPU wait latency distribution histogram"), + OPT_STRING(0, "hist-mode", &sched.hist_mode_str, "log|linear", + "latency bucket mode (log or linear, default: log)"), + OPT_STRING(0, "time", &sched.time_str, "str", + "Time span for analysis (start,stop)"), + OPT_PARENT(sched_options) + }; + const struct option replay_options[] = { + OPT_UINTEGER('r', "repeat", &sched.replay_repeat, + "repeat the workload replay N times (0: infinite)"), + OPT_PARENT(sched_options) + }; + const struct option map_options[] = { + OPT_BOOLEAN(0, "compact", &sched.map.comp, + "map output in compact mode"), + OPT_STRING(0, "color-pids", &sched.map.color_pids_str, "pids", + "highlight given pids in map"), + OPT_STRING(0, "color-cpus", &sched.map.color_cpus_str, "cpus", + "highlight given CPUs in map"), + OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus", + "display given CPUs in map"), + OPT_STRING(0, "task-name", &sched.map.task_name, "task", + "map output only for the given task name(s)."), + OPT_BOOLEAN(0, "fuzzy-name", &sched.map.fuzzy, + "given command name can be partially matched (fuzzy matching)"), + OPT_PARENT(sched_options) + }; + const struct option timehist_options[] = { + OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name, + "file", "vmlinux pathname"), + OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name, + "file", "kallsyms pathname"), + OPT_BOOLEAN('g', "call-graph", &sched.show_callchain, + "Display call chains if present (default on)"), + OPT_UINTEGER(0, "max-stack", &sched.max_stack, + "Maximum number of functions to display backtrace."), + OPT_CALLBACK(0, "symfs", NULL, "directory[,layout]", SYMFS_HELP, + symbol__config_symfs), + OPT_BOOLEAN('s', "summary", &sched.summary_only, + "Show only syscall summary with statistics"), + OPT_BOOLEAN('S', "with-summary", &sched.summary, + "Show all syscalls and summary with statistics"), + OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"), + OPT_BOOLEAN('n', "next", &sched.show_next, "Show next task"), + OPT_BOOLEAN('M', "migrations", &sched.show_migrations, "Show migration events"), + OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"), + OPT_BOOLEAN('I', "idle-hist", &sched.idle_hist, "Show idle events only"), + OPT_STRING(0, "time", &sched.time_str, "str", + "Time span for analysis (start,stop)"), + OPT_BOOLEAN(0, "state", &sched.show_state, "Show task state when sched-out"), + OPT_STRING('p', "pid", &symbol_conf.pid_list_str, "pid[,pid...]", + "analyze events only for given process id(s)"), + OPT_STRING('t', "tid", &symbol_conf.tid_list_str, "tid[,tid...]", + "analyze events only for given thread id(s)"), + OPT_STRING('C', "cpu", &cpu_list, "cpu", "list of cpus to profile"), + OPT_BOOLEAN(0, "show-prio", &sched.show_prio, "Show task priority"), + OPT_STRING(0, "prio", &sched.prio_str, "prio", + "analyze events only for given task priority(ies)"), + OPT_BOOLEAN('P', "pre-migrations", &sched.pre_migrations, "Show pre-migration wait time"), + OPT_PARENT(sched_options) + }; + const struct option stats_options[] = { + OPT_STRING('i', "input", &input_name, "file", + "`stats report` with input filename"), + OPT_STRING('o', "output", &output_name, "file", + "`stats record` with output filename"), + OPT_STRING('C', "cpu", &cpu_list, "cpu", "list of cpus to profile"), + OPT_BOOLEAN('v', "verbose", &verbose_field, "Show explanation for fields in the report"), + OPT_END() + }; + + const char * const latency_usage[] = { + "perf sched latency []", + NULL + }; + const char * const replay_usage[] = { + "perf sched replay []", + NULL + }; + const char * const map_usage[] = { + "perf sched map []", + NULL + }; + const char * const timehist_usage[] = { + "perf sched timehist []", + NULL + }; + const char *stats_usage[] = { + "perf sched stats {record|report} []", + NULL + }; + const char *const sched_subcommands[] = { "record", "latency", "map", + "replay", "script", + "timehist", "stats", NULL }; + const char *sched_usage[] = { + NULL, + NULL + }; + struct trace_sched_handler lat_ops = { + .wakeup_event = latency_wakeup_event, + .switch_event = latency_switch_event, + .runtime_event = latency_runtime_event, + .migrate_task_event = latency_migrate_task_event, + }; + struct trace_sched_handler map_ops = { + .switch_event = map_switch_event, + }; + struct trace_sched_handler replay_ops = { + .wakeup_event = replay_wakeup_event, + .switch_event = replay_switch_event, + .fork_event = replay_fork_event, + }; + struct trace_sched_handler stats_ops = {}; + int ret; + + perf_tool__init(&sched.tool, /*ordered_events=*/true); + sched.tool.sample = perf_sched__process_tracepoint_sample; + sched.tool.comm = perf_sched__process_comm; + sched.tool.namespaces = perf_event__process_namespaces; + sched.tool.lost = perf_event__process_lost; + sched.tool.fork = perf_sched__process_fork_event; + sched.tool.attr = perf_event__process_attr; + sched.tool.tracing_data = perf_event__process_tracing_data; + sched.tool.build_id = perf_event__process_build_id; + sched.tool.feature = perf_event__process_feature; + + argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands, + sched_usage, PARSE_OPT_STOP_AT_NON_OPTION); + if (!argc) + usage_with_options(sched_usage, sched_options); + + thread__set_priv_destructor(free); + + /* + * Aliased to 'perf script' for now: + */ + if (!strcmp(argv[0], "script")) { + ret = cmd_script(argc, argv); + } else if (strlen(argv[0]) > 2 && strstarts("record", argv[0])) { + ret = __cmd_record(argc, argv); + } else if (strlen(argv[0]) > 2 && strstarts("latency", argv[0])) { + sched.tp_handler = &lat_ops; + if (argc > 1) { + argc = parse_options(argc, argv, latency_options, latency_usage, 0); + if (argc) + usage_with_options(latency_usage, latency_options); + } + setup_sorting(&sched, latency_options, latency_usage); + ret = perf_sched__lat(&sched); + } else if (!strcmp(argv[0], "map")) { + if (argc) { + argc = parse_options(argc, argv, map_options, map_usage, 0); + if (argc) + usage_with_options(map_usage, map_options); + + if (sched.map.task_name) { + sched.map.task_names = strlist__new(sched.map.task_name, NULL); + if (sched.map.task_names == NULL) { + fprintf(stderr, "Failed to parse task names\n"); + ret = -1; + goto out; + } + } + } + sched.tp_handler = &map_ops; + setup_sorting(&sched, latency_options, latency_usage); + ret = perf_sched__map(&sched); + } else if (strlen(argv[0]) > 2 && strstarts("replay", argv[0])) { + sched.tp_handler = &replay_ops; + if (argc) { + argc = parse_options(argc, argv, replay_options, replay_usage, 0); + if (argc) + usage_with_options(replay_usage, replay_options); + } + ret = perf_sched__replay(&sched); + } else if (!strcmp(argv[0], "timehist")) { + if (argc) { + argc = parse_options(argc, argv, timehist_options, + timehist_usage, 0); + if (argc) + usage_with_options(timehist_usage, timehist_options); + } + if ((sched.show_wakeups || sched.show_next) && + sched.summary_only) { + pr_err(" Error: -s and -[n|w] are mutually exclusive.\n"); + parse_options_usage(timehist_usage, timehist_options, "s", true); + if (sched.show_wakeups) + parse_options_usage(NULL, timehist_options, "w", true); + if (sched.show_next) + parse_options_usage(NULL, timehist_options, "n", true); + ret = -EINVAL; + goto out; + } + ret = symbol__validate_sym_arguments(); + if (!ret) + ret = perf_sched__timehist(&sched); + } else if (!strcmp(argv[0], "stats")) { + const char *const stats_subcommands[] = {"record", "report", NULL}; + + sched.tp_handler = &stats_ops; + argc = parse_options_subcommand(argc, argv, stats_options, + stats_subcommands, + stats_usage, + PARSE_OPT_STOP_AT_NON_OPTION); + + if (argv[0] && !strcmp(argv[0], "record")) { + if (argc) + argc = parse_options(argc, argv, stats_options, + stats_usage, 0); + ret = perf_sched__schedstat_record(&sched, argc, argv); + } else if (argv[0] && !strcmp(argv[0], "report")) { + if (argc) + argc = parse_options(argc, argv, stats_options, + stats_usage, 0); + ret = perf_sched__schedstat_report(&sched); + } else if (argv[0] && !strcmp(argv[0], "diff")) { + if (argc) + argc = parse_options(argc, argv, stats_options, + stats_usage, 0); + ret = perf_sched__schedstat_diff(&sched, argc, argv); + } else { + ret = perf_sched__schedstat_live(&sched, argc, argv); + } + } else { + usage_with_options(sched_usage, sched_options); + } + +out: + /* free usage string allocated by parse_options_subcommand */ + free((void *)sched_usage[0]); + + return ret; +} -- cgit v1.3.1