linux-kernel - Re: 3.4-rc7 numa

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Message-ID: <CA+55aFwdyt310Mcsk==58Qa-sZD05A=M+R06xwOisbg2gex=RA@mail.gmail.com>
Date:	Tue, 22 May 2012 08:42:55 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Stephen Wilson <wilsons@...rt.ca>,
	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 3.4-rc7 numa_policy slab poison.

On Tue, May 22, 2012 at 4:59 AM, Mel Gorman <mgorman@...e.de> wrote:
>
> This bug is really old as it triggers as far back as 2.6.32.58. I don't
> know why yet.

Would somebody humor me, and try it without the MPOL_F_SHARED games?
The whole reference counting in the presense of setting and clearing
that bit looks totally crazy. I really cannot see how it could ever
work.

I realize that it avoids a copy, but I really don't see how the
refcounting is supposed to work for it..

                       Linus
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