Messages in this thread Patch in this message |  | | From | Namhyung Kim <> | Subject | [PATCH v2 2/3] perf script: Print comm, fork and exit events also | Date | Mon, 18 Nov 2013 14:34:53 +0900 |
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If --show-task option is given, also print internal COMM, FORK and EXIT events. It would be helpful for debugging.
$ perf script --show-task ... swapper 0 [009] 3350640.335261: sched:sched_switch: prev_comm=swapper/9 sleep 9486 [009] 3350640.335509: comm: perf --> sleep (9486) sleep 9486 [009] 3350640.335806: sched:sched_stat_runtime: comm=sleep pid=9486 firefox 2635 [003] 3350641.275896: fork: firefox (2635 --> 9487) firefox 2635 [003] 3350641.275896: sched:sched_process_fork: comm=firefox pid=2635 sleep 9486 [009] 3350641.336009: exit: sleep (9486)
Suggested-by: Frederic Weisbecker <fweisbec@gmail.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> --- tools/perf/Documentation/perf-script.txt | 3 + tools/perf/builtin-script.c | 115 +++++++++++++++++++++++++++++++ 2 files changed, 118 insertions(+)
diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt index e9cbfcddfa3f..9a9a7c3d592d 100644 --- a/tools/perf/Documentation/perf-script.txt +++ b/tools/perf/Documentation/perf-script.txt @@ -203,6 +203,9 @@ OPTIONS --show-kernel-path:: Try to resolve the path of [kernel.kallsyms] +--show-task + Display task related events (e.g. FORK, COMM, EXIT). + SEE ALSO -------- linkperf:perf-record[1], linkperf:perf-script-perl[1], diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c index b392770766dd..d05e6d835877 100644 --- a/tools/perf/builtin-script.c +++ b/tools/perf/builtin-script.c @@ -548,6 +548,7 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused, struct perf_script { struct perf_tool tool; struct perf_session *session; + bool show_task_events; }; static int process_attr(struct perf_tool *tool, union perf_event *event, @@ -578,6 +579,111 @@ static int process_attr(struct perf_tool *tool, union perf_event *event, return perf_evsel__check_attr(evsel, scr->session); } +static int process_comm_event(struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct thread *thread; + struct perf_script *script = container_of(tool, struct perf_script, tool); + struct perf_session *session = script->session; + struct perf_evsel *evsel = perf_evlist__first(session->evlist); + char *oldname; + int ret = -1; + + thread = machine__findnew_thread(machine, event->comm.pid, event->comm.tid); + if (thread == NULL) { + pr_debug("problem processing COMM event, skipping it.\n"); + return -1; + } + + oldname = strdup(thread__comm_str(thread)); + if (oldname == NULL) { + pr_debug("problem processing COMM event, skipping it.\n"); + return -1; + } + + if (perf_event__process_comm(tool, event, sample, machine) < 0) + goto out; + + if (!evsel->attr.sample_id_all) { + sample->cpu = 0; + sample->time = 0; + sample->tid = event->comm.tid; + sample->pid = event->comm.pid; + } + print_sample_start(sample, thread, evsel); + printf("comm: %s --> %s (%d)\n", oldname, event->comm.comm, + event->comm.tid); + ret = 0; + +out: + free(oldname); + return ret; +} + +static int process_fork_event(struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct thread *thread; + struct perf_script *script = container_of(tool, struct perf_script, tool); + struct perf_session *session = script->session; + struct perf_evsel *evsel = perf_evlist__first(session->evlist); + + if (perf_event__process_fork(tool, event, sample, machine) < 0) + return -1; + + thread = machine__findnew_thread(machine, event->fork.pid, event->fork.tid); + if (thread == NULL) { + pr_debug("problem processing FORK event, skipping it.\n"); + return -1; + } + + if (!evsel->attr.sample_id_all) { + sample->cpu = 0; + sample->time = event->fork.time; + sample->tid = event->fork.tid; + sample->pid = event->fork.pid; + } + print_sample_start(sample, thread, evsel); + printf("fork: %s (%d --> %d)\n", thread__comm_str(thread), + event->fork.ptid, event->fork.tid); + + return 0; +} +static int process_exit_event(struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct machine *machine) +{ + struct thread *thread; + struct perf_script *script = container_of(tool, struct perf_script, tool); + struct perf_session *session = script->session; + struct perf_evsel *evsel = perf_evlist__first(session->evlist); + + thread = machine__findnew_thread(machine, event->fork.pid, event->fork.tid); + if (thread == NULL) { + pr_debug("problem processing EXIT event, skipping it.\n"); + return -1; + } + + if (!evsel->attr.sample_id_all) { + sample->cpu = 0; + sample->time = 0; + sample->tid = event->comm.tid; + sample->pid = event->comm.pid; + } + print_sample_start(sample, thread, evsel); + printf("exit: %s (%d)\n", thread__comm_str(thread), event->fork.tid); + + if (perf_event__process_exit(tool, event, sample, machine) < 0) + return -1; + + return 0; +} + static void sig_handler(int sig __maybe_unused) { session_done = 1; @@ -589,6 +695,13 @@ static int __cmd_script(struct perf_script *script) signal(SIGINT, sig_handler); + /* override event processing functions */ + if (script->show_task_events) { + script->tool.comm = process_comm_event; + script->tool.fork = process_fork_event; + script->tool.exit = process_exit_event; + } + ret = perf_session__process_events(script->session, &script->tool); if (debug_mode) @@ -1351,6 +1464,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused) "display extended information from perf.data file"), OPT_BOOLEAN('\0', "show-kernel-path", &symbol_conf.show_kernel_path, "Show the path of [kernel.kallsyms]"), + OPT_BOOLEAN('\0', "show-task", &script.show_task_events, + "Show the fork/comm/exit events"), OPT_END() }; const char * const script_usage[] = { -- 1.7.11.7
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