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

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Message-ID: <4B2B8DC6.7010506@redhat.com>
Date:	Fri, 18 Dec 2009 09:12:22 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Avi Kivity <avi@...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 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.

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