linux-kernel - Re: [PATCH v2] vmscan: limit concurrent reclaimers in shrink

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Message-ID: <4B2B8E16.9070504@redhat.com>
Date:	Fri, 18 Dec 2009 16:13:42 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Rik van Riel <riel@...hat.com>
CC:	lwoodman@...hat.com, akpm@...ux-foundation.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	minchan.kim@...il.com
Subject: Re: [PATCH v2] vmscan: limit concurrent reclaimers in shrink_zone

On 12/18/2009 04:12 PM, Rik van Riel wrote:
> On 12/18/2009 08:38 AM, Avi Kivity wrote:
>
>>> + /* Number of processes running page reclaim code on this zone. */
>>> + atomic_t concurrent_reclaimers;
>>> + wait_queue_head_t reclaim_wait;
>>> +
>>
>> Counting semaphore?
>
> I don't see a safe way to adjust a counting semaphore
> through /proc/sys.

True.  Maybe it's worthwhile to add such a way if this pattern has more 
uses.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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