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/util/sample.c | 127 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 tools/perf/util/sample.c (limited to 'tools/perf/util/sample.c') diff --git a/tools/perf/util/sample.c b/tools/perf/util/sample.c new file mode 100644 index 000000000..cf7332932 --- /dev/null +++ b/tools/perf/util/sample.c @@ -0,0 +1,127 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include "sample.h" +#include "debug.h" +#include "thread.h" +#include +#ifndef EM_CSKY +#define EM_CSKY 252 +#endif +#ifndef EM_LOONGARCH +#define EM_LOONGARCH 258 +#endif +#include +#include +#include +#include "../../arch/x86/include/asm/insn.h" + +void perf_sample__init(struct perf_sample *sample, bool all) +{ + if (all) { + memset(sample, 0, sizeof(*sample)); + } else { + sample->evsel = NULL; + sample->user_regs = NULL; + sample->intr_regs = NULL; + sample->merged_callchain = false; + sample->callchain = NULL; + } +} + +void perf_sample__exit(struct perf_sample *sample) +{ + zfree(&sample->user_regs); + zfree(&sample->intr_regs); + if (sample->merged_callchain) { + zfree(&sample->callchain); + sample->merged_callchain = false; + } +} + +struct regs_dump *perf_sample__user_regs(struct perf_sample *sample) +{ + if (!sample->user_regs) { + sample->user_regs = zalloc(sizeof(*sample->user_regs)); + if (!sample->user_regs) + pr_err("Failure to allocate sample user_regs"); + } + return sample->user_regs; +} + + +struct regs_dump *perf_sample__intr_regs(struct perf_sample *sample) +{ + if (!sample->intr_regs) { + sample->intr_regs = zalloc(sizeof(*sample->intr_regs)); + if (!sample->intr_regs) + pr_err("Failure to allocate sample intr_regs"); + } + return sample->intr_regs; +} + +static int elf_machine_max_instruction_length(uint16_t e_machine) +{ + switch (e_machine) { + /* Fixed 4-byte (32-bit) architectures */ + case EM_AARCH64: + case EM_PPC: + case EM_PPC64: + case EM_MIPS: + case EM_SPARC: + case EM_SPARCV9: + case EM_ALPHA: + case EM_LOONGARCH: + case EM_PARISC: + case EM_SH: + return 4; + + /* Variable length or mixed-mode architectures */ + case EM_ARM: /* Variable due to Thumb/Thumb-2 */ + case EM_RISCV: /* Variable due to Compressed (C) extension */ + case EM_CSKY: /* Variable (16 or 32 bit) */ + case EM_ARC: /* Variable (ARCompact) */ + return 4; + case EM_S390: /* Variable (2, 4, or 6 bytes) */ + return 6; + case EM_68K: + return 10; + case EM_386: + case EM_X86_64: + return 15; + case EM_XTENSA: /* Variable (FLIX) */ + return 16; + default: + return MAX_INSN; + } +} + +void perf_sample__fetch_insn(struct perf_sample *sample, + struct thread *thread, + struct machine *machine) +{ + int ret, len; + bool is64bit = false; + uint16_t e_machine; + + if (!sample->ip || sample->insn_len != 0) + return; + + e_machine = thread__e_machine(thread, machine, /*e_flags=*/NULL); + len = elf_machine_max_instruction_length(e_machine); + len = thread__memcpy(thread, machine, sample->insn, + sample->ip, len, + &is64bit); + if (len <= 0) + return; + + sample->insn_len = len; + + if (e_machine == EM_386 || e_machine == EM_X86_64) { + /* Refine the x86 instruction length with the decoder. */ + struct insn insn; + + ret = insn_decode(&insn, sample->insn, len, + is64bit ? INSN_MODE_64 : INSN_MODE_32); + if (ret >= 0 && insn.length <= len) + sample->insn_len = insn.length; + } +} -- cgit v1.3.1