linux-kernel - Re: [PATCH v5 8/8] sched/numa: drop unnecessary variable in task

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Message-ID: <20131211092123.GV11295@suse.de>
Date:	Wed, 11 Dec 2013 09:21:23 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v5 8/8] sched/numa: drop unnecessary variable in
 task_weight

On Wed, Dec 11, 2013 at 08:50:01AM +0800, Wanpeng Li wrote:
> Drop unnecessary total_faults variable in function task_weight to unify
> task_weight and group_weight.
> 
> Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>

Nak.

task_weight is called for tasks other than current. If p handles a fault
in parallel then it can drop to 0 between when it's checked and used to
divide resulting in an oops.

-- 
Mel Gorman
SUSE Labs
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