From: David Ahern Date: Wed, 16 Nov 2016 06:06:32 +0000 (+0900) Subject: perf sched timehist: Add call graph options X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6c973c90852c3fa4b4e76a061ce89dcd373efccc;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git perf sched timehist: Add call graph options If callchains were recorded they are appended to the line with a default stack depth of 5: 1.874569 [0011] gcc[31949] 0.014 0.000 1.148 wait_for_completion_killable <- do_fork <- sys_vfork <- stub_vfork <- __vfork 1.874591 [0010] gcc[31951] 0.000 0.000 0.024 __cond_resched <- _cond_resched <- wait_for_completion <- stop_one_cpu <- sched_exec 1.874603 [0010] migration/10[59] 3.350 0.004 0.011 smpboot_thread_fn <- kthread <- ret_from_fork 1.874604 [0011] 1.148 0.000 0.035 cpu_startup_entry <- start_secondary 1.874723 [0005] 0.016 0.000 1.383 cpu_startup_entry <- start_secondary 1.874746 [0005] gcc[31949] 0.153 0.078 0.022 do_wait sys_wait4 <- system_call_fastpath <- __GI___waitpid --no-call-graph can be used to not show the callchains. --max-stack is used to control the number of frames shown (default of 5). -x/--excl options can be used to collapse redundant callchains to get more relevant data on screen. Signed-off-by: David Ahern Signed-off-by: Namhyung Kim Acked-by: Ingo Molnar Acked-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: Andi Kleen Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/r/20161116060634.28477-7-namhyung@kernel.org [ Add documentation based on above commit message ] Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt index 9a77bc73e8a3..83452088727d 100644 --- a/tools/perf/Documentation/perf-sched.txt +++ b/tools/perf/Documentation/perf-sched.txt @@ -99,6 +99,13 @@ OPTIONS for 'perf sched timehist' --kallsyms=:: kallsyms pathname +-g:: +--no-call-graph:: + Do not display call chains if present. + +--max-stack:: + Maximum number of functions to display in backtrace, default 5. + -s:: --summary:: Show only a summary of scheduling by thread with min, max, and average diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index 8fb7bcc2cb76..1f8731640809 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -14,6 +14,7 @@ #include "util/thread_map.h" #include "util/color.h" #include "util/stat.h" +#include "util/callchain.h" #include #include "util/trace-event.h" @@ -198,6 +199,8 @@ struct perf_sched { /* options for timehist command */ bool summary; bool summary_only; + bool show_callchain; + unsigned int max_stack; bool show_wakeups; u64 skipped_samples; }; @@ -1810,6 +1813,7 @@ static void timehist_header(void) static void timehist_print_sample(struct perf_sched *sched, struct perf_sample *sample, + struct addr_location *al, struct thread *thread) { struct thread_runtime *tr = thread__priv(thread); @@ -1827,6 +1831,18 @@ static void timehist_print_sample(struct perf_sched *sched, if (sched->show_wakeups) printf(" %-*s", comm_width, ""); + if (thread->tid == 0) + goto out; + + if (sched->show_callchain) + printf(" "); + + sample__fprintf_sym(sample, al, 0, + EVSEL__PRINT_SYM | EVSEL__PRINT_ONELINE | + EVSEL__PRINT_CALLCHAIN_ARROW, + &callchain_cursor, stdout); + +out: printf("\n"); } @@ -1878,9 +1894,14 @@ static void timehist_update_runtime_stats(struct thread_runtime *r, r->total_run_time += r->dt_run; } -static bool is_idle_sample(struct perf_sample *sample, - struct perf_evsel *evsel) +static bool is_idle_sample(struct perf_sched *sched, + struct perf_sample *sample, + struct perf_evsel *evsel, + struct machine *machine) { + struct thread *thread; + struct callchain_cursor *cursor = &callchain_cursor; + /* pid 0 == swapper == idle task */ if (sample->pid == 0) return true; @@ -1889,6 +1910,25 @@ static bool is_idle_sample(struct perf_sample *sample, if (perf_evsel__intval(evsel, sample, "prev_pid") == 0) return true; } + + /* 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 false; + } + + if (!symbol_conf.use_callchain || sample->callchain == NULL) + return false; + + if (thread__resolve_callchain(thread, cursor, evsel, sample, + NULL, NULL, sched->max_stack) != 0) { + if (verbose) + error("Failed to resolve callchain. Skipping\n"); + + return false; + } + callchain_cursor_commit(cursor); return false; } @@ -1999,13 +2039,14 @@ static struct thread_runtime *thread__get_runtime(struct thread *thread) return tr; } -static struct thread *timehist_get_thread(struct perf_sample *sample, +static struct thread *timehist_get_thread(struct perf_sched *sched, + struct perf_sample *sample, struct machine *machine, struct perf_evsel *evsel) { struct thread *thread; - if (is_idle_sample(sample, evsel)) { + if (is_idle_sample(sched, sample, evsel, machine)) { thread = get_idle_thread(sample->cpu); if (thread == NULL) pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu); @@ -2115,7 +2156,7 @@ static int timehist_sched_change_event(struct perf_tool *tool, goto out; } - thread = timehist_get_thread(sample, machine, evsel); + thread = timehist_get_thread(sched, sample, machine, evsel); if (thread == NULL) { rc = -1; goto out; @@ -2134,7 +2175,7 @@ static int timehist_sched_change_event(struct perf_tool *tool, timehist_update_runtime_stats(tr, sample->time, tprev); if (!sched->summary_only) - timehist_print_sample(sched, sample, thread); + timehist_print_sample(sched, sample, &al, thread); out: if (tr) { @@ -2327,6 +2368,30 @@ static int perf_timehist__process_sample(struct perf_tool *tool, return err; } +static int timehist_check_attr(struct perf_sched *sched, + struct perf_evlist *evlist) +{ + struct perf_evsel *evsel; + struct evsel_runtime *er; + + list_for_each_entry(evsel, &evlist->entries, node) { + er = perf_evsel__get_runtime(evsel); + if (er == NULL) { + pr_err("Failed to allocate memory for evsel runtime data\n"); + return -1; + } + + if (sched->show_callchain && + !(evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN)) { + pr_info("Samples do not have callchains.\n"); + sched->show_callchain = 0; + symbol_conf.use_callchain = 0; + } + } + + return 0; +} + static int perf_sched__timehist(struct perf_sched *sched) { const struct perf_evsel_str_handler handlers[] = { @@ -2359,6 +2424,8 @@ static int perf_sched__timehist(struct perf_sched *sched) sched->tool.ordered_events = true; sched->tool.ordering_requires_timestamps = true; + symbol_conf.use_callchain = sched->show_callchain; + session = perf_session__new(&file, false, &sched->tool); if (session == NULL) return -ENOMEM; @@ -2367,6 +2434,9 @@ static int perf_sched__timehist(struct perf_sched *sched) symbol__init(&session->header.env); + if (timehist_check_attr(sched, evlist) != 0) + goto out; + setup_pager(); /* setup per-evsel handlers */ @@ -2714,6 +2784,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused) .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", @@ -2759,6 +2831,10 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused) "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_STRING(0, "symfs", &symbol_conf.symfs, "directory", "Look for files with symbols relative to this directory"), OPT_BOOLEAN('s', "summary", &sched.summary_only,