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perf record: Add --initial-delay option

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perf stat has a --delay option to delay measuring the workload.

This is useful to skip measuring the startup phase of the program, which
is often very different from the main workload.

The same is useful for perf record when sampling.

--no-delay was already taken, so add a --initial-delay
to perf record too.
-D was already taken for record, so there is only a long option.

v2: Don't disable group members (Namhyung Kim)
v3: port to latest perf/core
    rename to --initial-delay to avoid conflict with --no-delay

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1389476307-2124-1-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andi Kleen 2014-01-11 13:38:27 -08:00 committed by Arnaldo Carvalho de Melo
parent d11416e76b
commit 6619a53ef7
4 changed files with 15 additions and 2 deletions
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4
tools/perf/Documentation/perf-record.txt
View File

@ -209,6 +209,10 @@ overrides that and uses per-thread mmaps. A side-effect of that is that
inheritance is automatically disabled. --per-thread is ignored with a warning
if combined with -a or -C options.
--initial-delay msecs::
After starting the program, wait msecs before measuring. This is useful to
filter out the startup phase of the program, which is often very different.
SEE ALSO
--------
linkperf:perf-stat[1], linkperf:perf-list[1]

9
tools/perf/builtin-record.c
View File

@ -499,7 +499,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
* (apart from group members) have enable_on_exec=1 set,
* so don't spoil it by prematurely enabling them.
*/
if (!target__none(&opts->target))
if (!target__none(&opts->target) && !opts->initial_delay)
perf_evlist__enable(rec->evlist);
/*
@ -508,6 +508,11 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
if (forks)
perf_evlist__start_workload(rec->evlist);
if (opts->initial_delay) {
usleep(opts->initial_delay * 1000);
perf_evlist__enable(rec->evlist);
}
for (;;) {
int hits = rec->samples;
@ -877,6 +882,8 @@ const struct option record_options[] = {
OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
"monitor event in cgroup name only",
parse_cgroups),
OPT_UINTEGER(0, "initial-delay", &record.opts.initial_delay,
"ms to wait before starting measurement after program start"),
OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
"user to profile"),

1
tools/perf/perf.h
View File

@ -269,6 +269,7 @@ struct record_opts {
u64 user_interval;
u16 stack_dump_size;
bool sample_transaction;
unsigned initial_delay;
};
#endif

3
tools/perf/util/evsel.c
View File

@ -658,7 +658,8 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
* Setting enable_on_exec for independent events and
* group leaders for traced executed by perf.
*/
if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel))
if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
!opts->initial_delay)
attr->enable_on_exec = 1;
}