Messages in this thread Patch in this message | | | From | Andrew Vagin <> | Subject | [PATCH 2/3] perf: teach perf inject to merge sched_stat_* and sched_switch events | Date | Mon, 6 Aug 2012 14:01:58 +0400 |
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You may want to know where and how long a task is sleeping. A callchain may be found in sched_switch and a time slice in stat_iowait, so I add handler in perf inject for merging this events.
My code saves sched_switch event for each process and when it meets stat_iowait, it reports the sched_switch event, because this event contains a correct callchain. By another words it replaces all stat_iowait events on proper sched_switch events.
Signed-off-by: Andrew Vagin <avagin@openvz.org> --- tools/perf/builtin-inject.c | 96 ++++++++++++++++++++++++++++++++++++++++-- 1 files changed, 91 insertions(+), 5 deletions(-)
diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index d04b7a4..247f41c 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -13,6 +13,8 @@ #include "util/debug.h" #include "util/parse-options.h" +#include "util/trace-event.h" + static char const *input_name = "-"; static const char *output_name = "-"; @@ -21,6 +23,9 @@ static int output; static u64 bytes_written; static bool inject_build_ids; +static bool inject_sched_stat; + +struct perf_session *session; static int perf_event__repipe_synth(struct perf_tool *tool __used, union perf_event *event, @@ -47,7 +52,7 @@ static int perf_event__repipe_synth(struct perf_tool *tool __used, static int perf_event__repipe_op2_synth(struct perf_tool *tool, union perf_event *event, - struct perf_session *session __used) + struct perf_session *s __used) { return perf_event__repipe_synth(tool, event, NULL); } @@ -59,7 +64,7 @@ static int perf_event__repipe_event_type_synth(struct perf_tool *tool, } static int perf_event__repipe_tracing_data_synth(union perf_event *event, - struct perf_session *session __used) + struct perf_session *s __used) { return perf_event__repipe_synth(NULL, event, NULL); } @@ -119,12 +124,12 @@ static int perf_event__repipe_task(struct perf_tool *tool, } static int perf_event__repipe_tracing_data(union perf_event *event, - struct perf_session *session) + struct perf_session *s) { int err; perf_event__repipe_synth(NULL, event, NULL); - err = perf_event__process_tracing_data(event, session); + err = perf_event__process_tracing_data(event, s); return err; } @@ -210,6 +215,83 @@ repipe: return 0; } +struct event_entry { + struct list_head list; + u32 pid; + union perf_event event[0]; +}; + +static LIST_HEAD(samples); + +static int perf_event__sched_stat(struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct perf_evsel *evsel __used, + struct machine *machine) +{ + int type; + struct event_format *e; + const char *evname = NULL; + uint32_t size; + struct event_entry *ent; + union perf_event *event_sw = NULL; + struct perf_sample sample_sw; + int sched_process_exit; + + size = event->header.size; + + type = trace_parse_common_type(session->pevent, sample->raw_data); + e = pevent_find_event(session->pevent, type); + if (e) + evname = e->name; + + sched_process_exit = !strcmp(evname, "sched_process_exit"); + + if (!strcmp(evname, "sched_switch") || sched_process_exit) { + list_for_each_entry(ent, &samples, list) + if (sample->pid == ent->pid) + break; + + if (&ent->list != &samples) { + list_del(&ent->list); + free(ent); + } + + if (sched_process_exit) + return 0; + + ent = malloc(size + sizeof(struct event_entry)); + ent->pid = sample->pid; + memcpy(&ent->event, event, size); + list_add(&ent->list, &samples); + return 0; + + } else if (!strncmp(evname, "sched_stat_", 11)) { + u32 pid; + + pid = raw_field_value(e, "pid", sample->raw_data); + + list_for_each_entry(ent, &samples, list) { + if (pid == ent->pid) + break; + } + + if (&ent->list == &samples) + return 0; + + event_sw = &ent->event[0]; + perf_session__parse_sample(session, event_sw, &sample_sw); + sample_sw.period = sample->period; + sample_sw.time = sample->time; + perf_session__synthesize_sample(session, event_sw, &sample_sw); + perf_event__repipe(tool, event_sw, &sample_sw, machine); + return 0; + } + + perf_event__repipe(tool, event, sample, machine); + + return 0; +} struct perf_tool perf_inject = { .sample = perf_event__repipe_sample, .mmap = perf_event__repipe, @@ -235,7 +317,6 @@ static void sig_handler(int sig __attribute__((__unused__))) static int __cmd_inject(void) { - struct perf_session *session; int ret = -EINVAL; signal(SIGINT, sig_handler); @@ -245,6 +326,9 @@ static int __cmd_inject(void) perf_inject.mmap = perf_event__repipe_mmap; perf_inject.fork = perf_event__repipe_task; perf_inject.tracing_data = perf_event__repipe_tracing_data; + } else if (inject_sched_stat) { + perf_inject.sample = perf_event__sched_stat; + perf_inject.ordered_samples = true; } session = perf_session__new(input_name, O_RDONLY, false, true, &perf_inject); @@ -272,6 +356,8 @@ static const char * const report_usage[] = { static const struct option options[] = { OPT_BOOLEAN('b', "build-ids", &inject_build_ids, "Inject build-ids into the output stream"), + OPT_BOOLEAN('s', "sched-stat", &inject_sched_stat, + "Set source call-chains for sched:shed-stat-*"), OPT_STRING('i', "input", &input_name, "file", "input file name"), OPT_STRING('o', "output", &output_name, "file", -- 1.7.1
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