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authorAndi Kleen <ak@linux.intel.com>2014-01-11 13:38:27 -0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-01-13 10:07:03 -0300
commit6619a53ef7572b9eaf7aa71ff7f74c0d06b3817b (patch)
tree30cc3f9744834be9ca30959cf1308028c3a3aa2f /tools/perf
parentd11416e76b3e2f60ed6cfa7c532d3b6777f66527 (diff)
downloadop-kernel-dev-6619a53ef7572b9eaf7aa71ff7f74c0d06b3817b.zip
op-kernel-dev-6619a53ef7572b9eaf7aa71ff7f74c0d06b3817b.tar.gz
perf record: Add --initial-delay option
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>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/Documentation/perf-record.txt4
-rw-r--r--tools/perf/builtin-record.c9
-rw-r--r--tools/perf/perf.h1
-rw-r--r--tools/perf/util/evsel.c3
4 files changed, 15 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index c407897..82bffac 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -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]
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 8860015..07d4cf8 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -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"),
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index b1cc84b..af1ce6e 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -269,6 +269,7 @@ struct record_opts {
u64 user_interval;
u16 stack_dump_size;
bool sample_transaction;
+ unsigned initial_delay;
};
#endif
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index ade8d9c..cd4630a 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -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;
}
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