perf script: Allow creating per-event dump files

Introduce a new option to dump trace output to files named by the
monitored events and update perf-script documentation accordingly.

Shown below is output of perf script command with the newly introduced

         $ perf record -e cycles -e cs -ag -- sleep 1
         $ perf script --per-event-dump
         $ ls

Without per-event-dump support, drawing flamegraphs for different events
would require post processing to separate events. You can monitor only
one event at a time if you want to get flamegraphs for different events.
Using this option, you can get the trace output files named by the
monitored events, and could draw flamegraphs according to the event's
Based-on-a-patch-by: default avataryuzhoujian <>
Cc: Adrian Hunter <>
Cc: David Ahern <>
Cc: Jiri Olsa <>
Cc: Namhyung Kim <>
Cc: Wang Nan <>
Link: default avatarArnaldo Carvalho de Melo <>
parent e669e833
......@@ -325,6 +325,10 @@ include::itrace.txt[]
Set the maximum number of program blocks to print with brstackasm for
each sample.
Create per event files with a "" name instead of
printing to stdout, useful, for instance, for generating flamegraphs.
If a callgraph address belongs to an inlined function, the inline stack
will be printed. Each entry has function name and file/line. Enabled by
......@@ -1392,6 +1392,7 @@ struct perf_script {
bool show_switch_events;
bool show_namespace_events;
bool allocated;
bool per_event_dump;
struct cpu_map *cpus;
struct thread_map *threads;
int name_width;
......@@ -1438,7 +1439,7 @@ static void process_event(struct perf_script *script,
struct thread *thread = al->thread;
struct perf_event_attr *attr = &evsel->attr;
unsigned int type = output_type(attr->type);
FILE *fp = stdout;
FILE *fp = evsel->priv;
if (output[type].fields == 0)
......@@ -1887,6 +1888,52 @@ static void sig_handler(int sig __maybe_unused)
session_done = 1;
static void perf_script__fclose_per_event_dump(struct perf_script *script)
struct perf_evlist *evlist = script->session->evlist;
struct perf_evsel *evsel;
evlist__for_each_entry(evlist, evsel) {
if (!evsel->priv)
evsel->priv = NULL;
static int perf_script__fopen_per_event_dump(struct perf_script *script)
struct perf_evsel *evsel;
evlist__for_each_entry(script->session->evlist, evsel) {
char filename[PATH_MAX];
snprintf(filename, sizeof(filename), "%s.%s.dump",
script->session->file->path, perf_evsel__name(evsel));
evsel->priv = fopen(filename, "w");
if (evsel->priv == NULL)
goto out_err_fclose;
return 0;
return -1;
static int perf_script__setup_per_event_dump(struct perf_script *script)
struct perf_evsel *evsel;
if (script->per_event_dump)
return perf_script__fopen_per_event_dump(script);
evlist__for_each_entry(script->session->evlist, evsel)
evsel->priv = stdout;
return 0;
static int __cmd_script(struct perf_script *script)
int ret;
......@@ -1908,8 +1955,16 @@ static int __cmd_script(struct perf_script *script)
if (script->show_namespace_events)
script->tool.namespaces = process_namespaces_event;
if (perf_script__setup_per_event_dump(script)) {
pr_err("Couldn't create the per event dump files\n");
return -1;
ret = perf_session__process_events(script->session);
if (script->per_event_dump)
if (debug_mode)
pr_err("Misordered timestamps: %" PRIu64 "\n", nr_unordered);
......@@ -2827,6 +2882,8 @@ int cmd_script(int argc, const char **argv)
"Show context switch events (if recorded)"),
OPT_BOOLEAN('\0', "show-namespace-events", &script.show_namespace_events,
"Show namespace events (if recorded)"),
OPT_BOOLEAN('\0', "per-event-dump", &script.per_event_dump,
"Dump trace output to files named by the monitored events"),
OPT_BOOLEAN('f', "force", &symbol_conf.force, "don't complain, do it"),
OPT_INTEGER(0, "max-blocks", &max_blocks,
"Maximum number of code blocks to dump with brstackinsn"),
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