linux-kernel - Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon

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Message-ID: <20100412190002.GA8595@a1.tnic>
Date:	Mon, 12 Apr 2010 21:00:02 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Rik van Riel <riel@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	sgunderson@...foot.com
Subject: Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the
 anon_vmas of a mergeable VMA

From: Rik van Riel <riel@...hat.com>
Date: Mon, Apr 12, 2010 at 02:40:22PM -0400

> On 04/12/2010 12:26 PM, Linus Torvalds wrote:
> 
> >But there is a _much_ more subtle case that involved swapping.
> >
> >So guys, here's my fairly simple theory on what happens:
> 
> That bug looks entirely possible.  Given that Borislav
> has heavy swapping going on, it is quite possible that
> this is the bug he has been triggering.

Yeah, about that. I dunno whether you guys saw that but the machine has
8Gb of RAM and shouldn't be swapping, AFAIK. The largest mem usage I
saw was 5Gb used, most of which pagecache. So I was kinda doubtful when
Linus came up with the swapping theory earlier. I'll pay attention to
the SwapCached in /proc/meminfo more to see whether we do any swapping.
It could be that there is a small amount which is swapped out for
whatever reason... Maybe that's the bug...

But I'll give the patch a run anyway in an hour or so anyway.

-- 
Regards/Gruss,
Boris.
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