linux-kernel - [PATCH 3/4] perf timechart: Conditionally update start

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Message-Id: <1405026417-9094-4-git-send-email-jolsa@kernel.org>
Date:	Thu, 10 Jul 2014 23:06:56 +0200
From:	Jiri Olsa <jolsa@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stanislav Fomichev <stfomichev@...dex-team.ru>,
	Jiri Olsa <jolsa@...nel.org>
Subject: [PATCH 3/4] perf timechart: Conditionally update start_time on fork

From: Stanislav Fomichev <stfomichev@...dex-team.ru>

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@...dex-team.ru>
Acked-by: Namhyung Kim <namhyung@...nel.org>
Link: http://lkml.kernel.org/n/1404835423-23098-4-git-send-email-stfomichev@yandex-team.ru
Signed-off-by: Jiri Olsa <jolsa@...nel.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;
 	}
-- 
1.8.3.1

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