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Date: Thu, 14 May 2009 13:26:12 -0400
From: Rik van Riel <riel@redhat.com>
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To: Andrew Morton <akpm@linux-foundation.org>
CC: MinChan Kim <minchan.kim@gmail.com>, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, kosaki.motohiro@jp.fujitsu.com, hannes@cmpxchg.org
Subject: Re: [PATCH] mmtom: Prevent shrinking of active anon lru list in case
 of no swap space V3
References: <20090514231555.f52c81eb.minchan.kim@gmail.com> <20090514093050.43472421.akpm@linux-foundation.org>
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Andrew Morton wrote:
> On Thu, 14 May 2009 23:15:55 +0900
> MinChan Kim <minchan.kim@gmail.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.