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

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Message-ID: <4A5F5454.8070300@redhat.com>
Date:	Thu, 16 Jul 2009 12:24:52 -0400
From:	Rik van Riel <riel@...hat.com>
To:	David Howells <dhowells@...hat.com>
CC:	Wu Fengguang <fengguang.wu@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"peterz@...radead.org" <peterz@...radead.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

David Howells wrote:
> Wu Fengguang <fengguang.wu@...el.com> wrote:
> 
>> 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.
> 
> I applied this to my test machine's kernel and rebooted.  It hit the OOM
> killer a few seconds after starting msgctl11 .  Furthermore, it was not then
> responsive to SysRq+b or anything else and had to have the magic button
> pushed.

It's part of a series of patches, including the three
posted by Kosaki-san last night (to track the number
of isolated pages) and the patch I posted last night
(to throttle reclaim when too many pages are isolated).

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