linux-kernel - [tip:sched/core] sched/numa: Kill the wrong/ dead TASK_DEAD check in task_numa

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Message-ID: <tip-be34f0f3e6aed6e828a8059247d169d38da128d7@git.kernel.org>
Date:	Wed, 24 Sep 2014 00:57:53 -0700
From:	tip-bot for Oleg Nesterov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	riel@...hat.com, mgorman@...e.de, tglx@...utronix.de,
	oleg@...hat.com
Subject: [tip:sched/core] sched/numa: Kill the wrong/
 dead TASK_DEAD check in task_numa_fault()

Commit-ID:  be34f0f3e6aed6e828a8059247d169d38da128d7
Gitweb:     http://git.kernel.org/tip/be34f0f3e6aed6e828a8059247d169d38da128d7
Author:     Oleg Nesterov <oleg@...hat.com>
AuthorDate: Sun, 21 Sep 2014 21:47:43 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 24 Sep 2014 09:35:05 +0200

sched/numa: Kill the wrong/dead TASK_DEAD check in task_numa_fault()

current->state == TASK_DEAD means that the task is doing its
last schedule(), page fault is obviously impossible at this
stage.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Acked-by: Mel Gorman <mgorman@...e.de>
Acked-by: Rik van Riel <riel@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/20140921194743.GA30114@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2a1e6ac..9ee3d4f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1817,10 +1817,6 @@ void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags)
 	if (!p->mm)
 		return;
 
-	/* Do not worry about placement if exiting */
-	if (p->state == TASK_DEAD)
-		return;
-
 	/* Allocate buffer to track faults on a per-node basis */
 	if (unlikely(!p->numa_faults_memory)) {
 		int size = sizeof(*p->numa_faults_memory) *
--
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