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>
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 @@
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]