linux-kernel - [PATCH -mm 3/3] exit: exit_notify: re-use "dead" list to autoreap current

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Message-ID: <20141120183428.GA10280@redhat.com>
Date:	Thu, 20 Nov 2014 19:34:28 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Aaron Tomlin <atomlin@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Sterling Alexander <stalexan@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH -mm 3/3] exit: exit_notify: re-use "dead" list to autoreap
	current

After the previous change we can add just the exiting EXIT_DEAD task
to the "dead" list and remove another release_task(tsk).

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/exit.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index ccf27cb..43394f7 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -632,6 +632,8 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
 	}
 
 	tsk->exit_state = autoreap ? EXIT_DEAD : EXIT_ZOMBIE;
+	if (tsk->exit_state == EXIT_DEAD)
+		list_add(&tsk->ptrace_entry, &dead);
 
 	/* mt-exec, de_thread() is waiting for group leader */
 	if (unlikely(tsk->signal->notify_count < 0))
@@ -642,10 +644,6 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
 		list_del_init(&p->ptrace_entry);
 		release_task(p);
 	}
-
-	/* If the process is dead, release it - nobody will wait for it */
-	if (autoreap)
-		release_task(tsk);
 }
 
 #ifdef CONFIG_DEBUG_STACK_USAGE
-- 
1.5.5.1

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