linux-kernel - Re: Found the commit that causes the OOMs

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Message-ID: <2f11576a0906291208q4e924258w589c8017ae8a0b6e@mail.gmail.com>
Date:	Tue, 30 Jun 2009 04:08:58 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Howells <dhowells@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"riel@...hat.com" <riel@...hat.com>,
	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>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: Found the commit that causes the OOMs

typo.

> OK. we need learn testcase more.
>
> [read test program source code... ]
>
> this program makes `cat /proc/sys/kernel/msgmni` * 10 processes.
> At least, one process creation need one userland stack page (i.e. one anon)
> + one kernel stack page (i.e. one unaccount page) + one pagetable page.
>
> In my 1GB box environment,  default msgmni is 11969.
> Oh well, the system physical ram (255744) is less than needed pages (11969 * 3).

wrong) 11969 * 3
correct) 119690 * 3
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