linux-kernel - Re: [PATCH -mm] proc: don't take ->siglock for /proc/pid/oom

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Message-ID: <20100331091740.GB11438@redhat.com>
Date:	Wed, 31 Mar 2010 11:17:40 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	anfei <anfei.zhou@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	nishimura@....nes.nec.co.jp,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm] proc: don't take ->siglock for /proc/pid/oom_adj

On 03/30, David Rientjes wrote:
>
> On Tue, 30 Mar 2010, Oleg Nesterov wrote:
>
> > ->siglock is no longer needed to access task->signal, change
> > oom_adjust_read() and oom_adjust_write() to read/write oom_adj
> > lockless.
> >
> > Yes, this means that "echo 2 >oom_adj" and "echo 1 >oom_adj"
> > can race and the second write can win, but I hope this is OK.
> >
>
> Ok, but could you base this on -mm at
> http://userweb.kernel.org/~akpm/mmotm/ since an additional tunable has
> been added (oom_score_adj), which does the same thing?

Ah, OK, will do.

Thanks David.

Oleg.

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