[PATCH 1/3] perf record: support duration option to run during specified time

[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.

Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index cdf58ec..19c65b5 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 +958,7 @@ 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 during specified seconds"),
 	OPT_END()
 };
 
-- 
1.7.9.5

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