linux-kernel - Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in case of no swap space V3

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Message-ID: <4A0C5434.3040905@redhat.com>
Date:	Thu, 14 May 2009 13:26:12 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	MinChan Kim <minchan.kim@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, kosaki.motohiro@...fujitsu.com,
	hannes@...xchg.org
Subject: Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in case
 of no swap space V3

Andrew Morton wrote:
> On Thu, 14 May 2009 23:15:55 +0900
> MinChan Kim <minchan.kim@...il.com> wrote:
> 
>> Now shrink_zone can deactivate active anon pages even if we don't have a swap device. 
>> Many embedded products don't have a swap device. So the deactivation of anon pages is unnecessary. 
> 
> Does shrink_list() need to scan the anon LRUs at all if there's no swap
> online?

It doesn't.  Get_scan_ratio() will return 0 as the
anon percentage if no swap is online.
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