[PATCH v2] perf, tools: support duration option to run during specifiedtime

[Joonsoo Kim]

Currently, there is no method to quit at specified time later.
We are used to using 'sleep N' as command argument if we need it,
but explicitly supporting this feature maybe makes sense.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index cdf58ec..1384118 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -29,6 +29,7 @@
 #include <sched.h>
 #include <sys/mman.h>
 
+static unsigned int duration;
 #ifndef HAVE_ON_EXIT
 #ifndef ATEXIT_MAX
 #define ATEXIT_MAX 32
@@ -194,7 +195,7 @@ static void perf_record__sig_exit(int exit_status __maybe_unused, void *arg)
 			psignal(WTERMSIG(status), rec->progname);
 	}
 
-	if (signr == -1 || signr == SIGUSR1)
+	if (signr == -1 || signr == SIGUSR1 || signr == SIGALRM)
 		return;
 
 	signal(signr, SIG_DFL);
@@ -404,6 +405,7 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
 	signal(SIGCHLD, sig_handler);
 	signal(SIGINT, sig_handler);
 	signal(SIGUSR1, sig_handler);
+	signal(SIGALRM, sig_handler);
 
 	if (!output_name) {
 		if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
@@ -471,6 +473,7 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
 			goto out_delete_session;
 	}
 
+	alarm(duration);
 	if (forks) {
 		err = perf_evlist__prepare_workload(evsel_list, &opts->target,
 						    argv, opts->pipe_output,
@@ -955,6 +958,8 @@ const struct option record_options[] = {
 		     parse_branch_stack),
 	OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
 		    "sample by weight (on special events only)"),
+	OPT_UINTEGER(0, "duration", &duration,
+		    "run for specified duration (seconds)"),
 	OPT_END()
 };
 
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/