linux-kernel - [PATCH 1/3] de_thread: mt-exec should update ->real_start

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Message-ID: <20130610183317.GA14398@redhat.com>
Date:	Mon, 10 Jun 2013 20:33:17 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	John Stultz <johnstul@...ibm.com>,
	Tomas Janousek <tjanouse@...hat.com>,
	Tomas Smetana <tsmetana@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] de_thread: mt-exec should update ->real_start_time

924b42d5 "Use boot based time for process start time and boot
time in /proc" updated copy_process/do_task_stat but forgot
about de_thread(). This breaks "ps axOT" if a sub-thread execs.

Note: I think that task->start_time should die.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 fs/exec.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index 00eaba7..aeace12 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -930,6 +930,7 @@ static int de_thread(struct task_struct *tsk)
 		 * also take its birthdate (always earlier than our own).
 		 */
 		tsk->start_time = leader->start_time;
+		tsk->real_start_time = leader->real_start_time;
 
 		BUG_ON(!same_thread_group(leader, tsk));
 		BUG_ON(has_group_leader_pid(tsk));
-- 
1.5.5.1

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