linux-kernel - Re: [PATCH] mm: forbid lumpy-reclaim in shrink_active

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Message-ID: <4F6773CC.2010705@openvz.org>
Date:	Mon, 19 Mar 2012 21:58:36 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Rik van Riel <riel@...hat.com>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] mm: forbid lumpy-reclaim in shrink_active_list()

Rik van Riel wrote:
> On 03/19/2012 05:18 AM, Konstantin Khlebnikov wrote:
>> This patch reset reclaim mode in shrink_active_list() to RECLAIM_MODE_SINGLE | RECLAIM_MODE_ASYNC.
>> (sync/async sign is used only in shrink_page_list and does not affect shrink_active_list)
>>
>> Currenly shrink_active_list() sometimes works in lumpy-reclaim mode,
>> if RECLAIM_MODE_LUMPYRECLAIM left over from earlier shrink_inactive_list().
>> Meanwhile, in age_active_anon() sc->reclaim_mode is totally zero.
>> So, current behavior is too complex and confusing, all this looks like bug.
>>
>> In general, shrink_active_list() populate inactive list for next shrink_inactive_list().
>> Lumpy shring_inactive_list() isolate pages around choosen one from both active and
>> inactive lists. So, there no reasons for lumpy-isolation in shrink_active_list()
>>
>> Proposed-by: Hugh Dickins<hughd@...gle.com>
>> Link: https://lkml.org/lkml/2012/3/15/583
>> Signed-off-by: Konstantin Khlebnikov<khlebnikov@...nvz.org>
>
> Confirmed, this is already done by commit
> 26f5f2f1aea7687565f55c20d69f0f91aa644fb8 in the
> linux-next tree.
>

No, your patch fix this problem only if CONFIG_COMPACTION=y
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