linux-kernel - [PATCH] sched/numa: kill the wrong/dead TASK_DEAD check in task_numa

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Date:	Sun, 21 Sep 2014 21:47:43 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] 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>
---
 kernel/sched/fair.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 82088b2..0090e8c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1804,10 +1804,6 @@ 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) *
-- 
1.5.5.1


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