Date: Thu, 16 Jul 2009 17:59:54 +0200
From: Johannes Weiner <hannes@cmpxchg.org>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Rik van Riel <riel@redhat.com>,
       Christoph Lameter <cl@linux-foundation.org>,
       Peter Zijlstra <peterz@infradead.org>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Minchan Kim <minchan.kim@gmail.com>,
       David Howells <dhowells@redhat.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>, "tytso@mit.edu" <tytso@mit.edu>,
       "linux-mm@kvack.org" <linux-mm@kvack.org>,
       "elladan@eskimo.com" <elladan@eskimo.com>,
       "npiggin@suse.de" <npiggin@suse.de>,
       "Barnes, Jesse" <jesse.barnes@intel.com>
Subject: Re: [PATCH] mm: count only reclaimable lru pages v2
Message-ID: <20090716155954.GA1883@cmpxchg.org>
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On Thu, Jul 16, 2009 at 11:09:01PM +0800, Wu Fengguang wrote:

> mm: count only reclaimable lru pages 
> 
> global_lru_pages() / zone_lru_pages() can be used in two ways:
> - to estimate max reclaimable pages in determine_dirtyable_memory()  
> - to calculate the slab scan ratio
> 
> When swap is full or not present, the anon lru lists are not reclaimable
> and also won't be scanned. So the anon pages shall not be counted in both
> usage scenarios. Also rename to _reclaimable_pages: now they are counting
> the possibly reclaimable lru pages.
> 
> It can greatly (and correctly) increase the slab scan rate under high memory
> pressure (when most file pages have been reclaimed and swap is full/absent),
> thus reduce false OOM kills.
> 
> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Reviewed-by: Rik van Riel <riel@redhat.com>
> Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
> Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>
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