[tip:perf/core] perf timechart: Conditionally update start_time on fork

[tip-bot for Stanislav Fomichev <tipbot@zytor.com>]

Commit-ID:  962e310af5dff432745ae7494096ed54b752e63e
Gitweb:     http://git.kernel.org/tip/962e310af5dff432745ae7494096ed54b752e63e
Author:     Stanislav Fomichev <stfomichev@yandex-team.ru>
AuthorDate: Tue, 8 Jul 2014 20:03:42 +0400
Committer:  Jiri Olsa <jolsa@kernel.org>
CommitDate: Thu, 10 Jul 2014 00:22:54 +0200

perf timechart: Conditionally update start_time on fork

We don't need to overwrite current task start_time on fork, so update it
only if it's zero.

Signed-off-by: Stanislav Fomichev <stfomichev@yandex-team.ru>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/n/1404835423-23098-4-git-send-email-stfomichev@yandex-team.ru
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/builtin-timechart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 4079062..37bf1eb 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -242,7 +242,7 @@ static void pid_fork(struct timechart *tchart, int pid, int ppid, u64 timestamp)
 		pid_set_comm(tchart, pid, pp->current->comm);
 
 	p->start_time = timestamp;
-	if (p->current) {
+	if (p->current && !p->current->start_time) {
 		p->current->start_time = timestamp;
 		p->current->state_since = timestamp;
 	}