From: Arnaldo Carvalho de Melo Date: Wed, 14 Aug 2019 19:51:28 +0000 (-0300) Subject: perf script: Allow specifying event to switch off processing of other events X-Git-Tag: v5.4-rc1~177^2~19^2~13 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=dd41f660c03a6d8f2c2f3b2cccf50d8c4e06dd42;p=linux.git perf script: Allow specifying event to switch off processing of other events Counterpart of --switch-on: # perf record -e sched:*,syscalls:sys_*_nanosleep sleep 1 [ perf record: Woken up 36 times to write data ] [ perf record: Captured and wrote 0.032 MB perf.data (10 samples) ] # # perf script :20918 20918 [002] 109866.143696: sched:sched_waking: comm=perf pid=20919 prio=120 target_cpu=001 :20918 20918 [002] 109866.143702: sched:sched_wakeup: perf:20919 [120] success=1 CPU:001 sleep 20919 [001] 109866.144081: sched:sched_process_exec: filename=/usr/bin/sleep pid=20919 old_pid=20919 sleep 20919 [001] 109866.144408: syscalls:sys_enter_nanosleep: rqtp: 0x7ffc2384fef0, rmtp: 0x00000000 sleep 20919 [001] 109866.144411: sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n> sleep 20919 [001] 109866.144412: sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120] swapper 0 [001] 109867.144568: sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001 swapper 0 [001] 109867.144586: sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001 sleep 20919 [001] 109867.144614: syscalls:sys_exit_nanosleep: 0x0 sleep 20919 [001] 109867.144753: sched:sched_process_exit: comm=sleep pid=20919 prio=120 # # perf script --switch-off syscalls:sys_exit_nanosleep :20918 20918 [002] 109866.143696: sched:sched_waking: comm=perf pid=20919 prio=120 target_cpu=001 :20918 20918 [002] 109866.143702: sched:sched_wakeup: perf:20919 [120] success=1 CPU:001 sleep 20919 [001] 109866.144081: sched:sched_process_exec: filename=/usr/bin/sleep pid=20919 old_pid=20919 sleep 20919 [001] 109866.144408: syscalls:sys_enter_nanosleep: rqtp: 0x7ffc2384fef0, rmtp: 0x00000000 sleep 20919 [001] 109866.144411: sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n> sleep 20919 [001] 109866.144412: sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120] swapper 0 [001] 109867.144568: sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001 swapper 0 [001] 109867.144586: sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001 sleep 20919 [001] 109867.144753: sched:sched_process_exit: comm=sleep pid=20919 prio=120 # # perf script --switch-on syscalls:sys_enter_nanosleep --switch-off syscalls:sys_exit_nanosleep sleep 20919 [001] 109866.144411: sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n> sleep 20919 [001] 109866.144412: sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120] swapper 0 [001] 109867.144568: sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001 swapper 0 [001] 109867.144586: sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001 # # perf script --switch-on syscalls:sys_enter_nanosleep --switch-off syscalls:sys_exit_nanosleep --show-on-off sleep 20919 [001] 109866.144408: syscalls:sys_enter_nanosleep: rqtp: 0x7ffc2384fef0, rmtp: 0x00000000 sleep 20919 [001] 109866.144411: sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n> sleep 20919 [001] 109866.144412: sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120] swapper 0 [001] 109867.144568: sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001 swapper 0 [001] 109867.144586: sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001 sleep 20919 [001] 109867.144614: syscalls:sys_exit_nanosleep: 0x0 # Now think about using this together with 'perf probe' to create custom on/off events in your app :-) Cc: Adrian Hunter Cc: Florian Weimer Cc: Jiri Olsa Cc: Namhyung Kim Cc: William Cohen Link: https://lkml.kernel.org/n/tip-li3j01c4tmj9kw6ydsl8swej@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt index 24eea68ee829..2599b057e47b 100644 --- a/tools/perf/Documentation/perf-script.txt +++ b/tools/perf/Documentation/perf-script.txt @@ -420,8 +420,11 @@ include::itrace.txt[] --switch-on EVENT_NAME:: Only consider events after this event is found. +--switch-off EVENT_NAME:: + Stop considering events after this event is found. + --show-on-off-events:: - Show the --switch-on event too. + Show the --switch-on/off events too. SEE ALSO -------- diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c index fa0cc8b0eccc..b6eed0f7e835 100644 --- a/tools/perf/builtin-script.c +++ b/tools/perf/builtin-script.c @@ -1617,7 +1617,8 @@ static int perf_sample__fprintf_synth(struct perf_sample *sample, } struct evswitch { - struct evsel *on; + struct evsel *on, + *off; bool discarding; bool show_on_off_events; }; @@ -1820,8 +1821,20 @@ static void process_event(struct perf_script *script, if (!script->evswitch.show_on_off_events) return; + + goto print_it; } + if (script->evswitch.off && !script->evswitch.discarding) { + if (script->evswitch.off != evsel) + goto print_it; + + script->evswitch.discarding = true; + + if (!script->evswitch.show_on_off_events) + return; + } +print_it: ++es->samples; perf_sample__fprintf_start(sample, thread, evsel, @@ -3412,7 +3425,8 @@ int cmd_script(int argc, const char **argv) struct utsname uts; char *script_path = NULL; const char **__argv; - const char *event_switch_on = NULL; + const char *event_switch_on = NULL, + *event_switch_off = NULL; int i, j, err = 0; struct perf_script script = { .tool = { @@ -3557,7 +3571,9 @@ int cmd_script(int argc, const char **argv) OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules, "file", "file saving guest os /proc/modules"), OPT_STRING(0, "switch-on", &event_switch_on, - "event", "Consider events from the first ocurrence of this event"), + "event", "Consider events after the ocurrence of this event"), + OPT_STRING(0, "switch-off", &event_switch_off, + "event", "Stop considering events after the ocurrence of this event"), OPT_BOOLEAN(0, "show-on-off-events", &script.evswitch.show_on_off_events, "Show the on/off switch events, used with --switch-on"), OPT_END() @@ -3894,6 +3910,15 @@ int cmd_script(int argc, const char **argv) script.evswitch.discarding = true; } + if (event_switch_off) { + script.evswitch.off = perf_evlist__find_evsel_by_str(session->evlist, event_switch_off); + if (script.evswitch.off == NULL) { + fprintf(stderr, "switch-off event not found (%s)\n", event_switch_off); + err = -ENOENT; + goto out_delete; + } + } + err = __cmd_script(&script); flush_scripting();