4 files changed, 15 insertions, 2 deletions

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index c407897f0435..82bffac036e1 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 88600158400e..07d4cf8d3fd3 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 b1cc84b01d5b..af1ce6e14a93 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 ade8d9c1c431..cd4630abfa43 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;
 }