linux-kernel - Re: [PATCH] mm: count only reclaimable lru pages v2

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Message-ID: <20090716155954.GA1883@cmpxchg.org>
Date:	Thu, 16 Jul 2009 17:59:54 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	David Howells <dhowells@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"elladan@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"Barnes, Jesse" <jesse.barnes@...el.com>
Subject: Re: [PATCH] mm: count only reclaimable lru pages v2

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@...llo.nl>
> Reviewed-by: Rik van Riel <riel@...hat.com>
> Reviewed-by: Christoph Lameter <cl@...ux-foundation.org>
> Reviewed-by: Minchan Kim <minchan.kim@...il.com>
> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>

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