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

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Message-Id: <1247751651.6586.17.camel@laptop>
Date:	Thu, 16 Jul 2009 15:40:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	David Howells <dhowells@...hat.com>,
	"riel@...hat.com" <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.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

On Thu, 2009-07-16 at 21:34 +0800, Wu Fengguang wrote:
> 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 thus won't be scanned. So the anon pages shall not be counted. Also
> rename the function names to reflect the new meaning.
> 
> 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 avoid possible false OOM kills.
> 
> Cc: Minchan Kim <minchan.kim@...il.com>
> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>

Makes sense.

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>


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