From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- tools/perf/tests/openat-syscall-tp-fields.c | 163 ++++++++++++++++++++++++++++ 1 file changed, 163 insertions(+) create mode 100644 tools/perf/tests/openat-syscall-tp-fields.c (limited to 'tools/perf/tests/openat-syscall-tp-fields.c') diff --git a/tools/perf/tests/openat-syscall-tp-fields.c b/tools/perf/tests/openat-syscall-tp-fields.c new file mode 100644 index 000000000..9ff8caff9 --- /dev/null +++ b/tools/perf/tests/openat-syscall-tp-fields.c @@ -0,0 +1,163 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include "evlist.h" +#include "evsel.h" +#include "thread_map.h" +#include "record.h" +#include "tests.h" +#include "debug.h" +#include "util/mmap.h" +#include +#include +#include "util/sample.h" + +#ifndef O_DIRECTORY +#define O_DIRECTORY 00200000 +#endif +#ifndef AT_FDCWD +#define AT_FDCWD -100 +#endif + +static int test__syscall_openat_tp_fields(struct test_suite *test __maybe_unused, + int subtest __maybe_unused) +{ + struct record_opts opts = { + .target = { + .uses_mmap = true, + }, + .no_buffering = true, + .freq = 1, + .mmap_pages = 256, + .raw_samples = true, + }; + const char *filename = "/etc/passwd"; + int flags = O_RDONLY | O_DIRECTORY; + struct evlist *evlist = evlist__new(); + struct evsel *evsel; + int ret = TEST_FAIL, err, i, nr_events = 0, nr_polls = 0; + char sbuf[STRERR_BUFSIZE]; + + if (evlist == NULL) { + pr_debug("%s: evlist__new\n", __func__); + goto out; + } + + evsel = evsel__newtp("syscalls", "sys_enter_openat"); + if (IS_ERR(evsel)) { + pr_debug("%s: evsel__newtp\n", __func__); + ret = PTR_ERR(evsel) == -EACCES ? TEST_SKIP : TEST_FAIL; + goto out_delete_evlist; + } + + evlist__add(evlist, evsel); + + err = evlist__create_maps(evlist, &opts.target); + if (err < 0) { + pr_debug("%s: evlist__create_maps\n", __func__); + goto out_delete_evlist; + } + + evsel__config(evsel, &opts, NULL); + + perf_thread_map__set_pid(evlist->core.threads, 0, getpid()); + + err = evlist__open(evlist); + if (err < 0) { + pr_debug("perf_evlist__open: %s\n", + str_error_r(errno, sbuf, sizeof(sbuf))); + goto out_delete_evlist; + } + + err = evlist__mmap(evlist, UINT_MAX); + if (err < 0) { + pr_debug("evlist__mmap: %s\n", + str_error_r(errno, sbuf, sizeof(sbuf))); + goto out_delete_evlist; + } + + evlist__enable(evlist); + + /* + * Generate the event: + */ + openat(AT_FDCWD, filename, flags); + + while (1) { + int before = nr_events; + + for (i = 0; i < evlist->core.nr_mmaps; i++) { + union perf_event *event; + struct mmap *md; + + md = &evlist->mmap[i]; + if (perf_mmap__read_init(&md->core) < 0) + continue; + + while ((event = perf_mmap__read_event(&md->core)) != NULL) { + const u32 type = event->header.type; + int tp_flags; + struct perf_sample sample; + + ++nr_events; + + if (type != PERF_RECORD_SAMPLE) { + perf_mmap__consume(&md->core); + continue; + } + + perf_sample__init(&sample, /*all=*/false); + err = evsel__parse_sample(evsel, event, &sample); + if (err) { + pr_debug("Can't parse sample, err = %d\n", err); + perf_sample__exit(&sample); + goto out_delete_evlist; + } + + tp_flags = perf_sample__intval(&sample, "flags"); + perf_sample__exit(&sample); + /* C library wrapper may set additional flags, + access mode must be unchanged */ + if ((tp_flags & O_ACCMODE) != (flags & O_ACCMODE) || + (tp_flags & flags) != flags) { + pr_debug("%s: Expected flags=%#x, got %#x\n", + __func__, flags, tp_flags); + goto out_delete_evlist; + } + + goto out_ok; + } + perf_mmap__read_done(&md->core); + } + + if (nr_events == before) + evlist__poll(evlist, 10); + + if (++nr_polls > 5) { + pr_debug("%s: no events!\n", __func__); + goto out_delete_evlist; + } + } +out_ok: + ret = TEST_OK; +out_delete_evlist: + evlist__delete(evlist); +out: + return ret; +} + +static struct test_case tests__syscall_openat_tp_fields[] = { + TEST_CASE_REASON("syscalls:sys_enter_openat event fields", + syscall_openat_tp_fields, + "permissions"), + { .name = NULL, } +}; + +struct test_suite suite__syscall_openat_tp_fields = { + .desc = "syscalls:sys_enter_openat event fields", + .test_cases = tests__syscall_openat_tp_fields, +}; -- cgit v1.3.1