linux-kernel - Re: [PATCH v2 04/10] Add additional isolation mode

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Message-ID: <4DE66107.10908@redhat.com>
Date:	Wed, 01 Jun 2011 11:55:51 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v2 04/10] Add additional isolation mode

On 05/29/2011 02:13 PM, Minchan Kim wrote:
> There are some places to isolate lru page and I believe
> users of isolate_lru_page will be growing.
> The purpose of them is each different so part of isolated pages
> should put back to LRU, again.
>
> The problem is when we put back the page into LRU,
> we lose LRU ordering and the page is inserted at head of LRU list.
> It makes unnecessary LRU churning so that vm can evict working set pages
> rather than idle pages.
>
> This patch adds new modes when we isolate page in LRU so we don't isolate pages
> if we can't handle it. It could reduce LRU churning.
>
> This patch doesn't change old behavior. It's just used by next patches.
>
> Cc: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> Cc: Mel Gorman<mgorman@...e.de>
> Cc: Rik van Riel<riel@...hat.com>
> Cc: Andrea Arcangeli<aarcange@...hat.com>
> Cc: Johannes Weiner<hannes@...xchg.org>
> Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
> Signed-off-by: Minchan Kim<minchan.kim@...il.com>

Acked-by: Rik van Riel <riel@...hat.com>
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