linux-kernel - Re: [PATCH] [BUGFIX] update mm->owner even if no next owner.

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Date:	Mon, 13 Jun 2011 07:03:03 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Ying Han <yinghan@...gle.com>, Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] [BUGFIX] update mm->owner even if no next owner.

On Mon, 13 Jun 2011, KAMEZAWA Hiroyuki wrote:
> On Sun, 12 Jun 2011 18:41:58 -0700 (PDT)
> Hugh Dickins <hughd@...gle.com> wrote:
> > 
> > The version I've signed off and am actually testing is below;
> > but I've not had enough time to spare on the machine which reproduced
> > it before, and another I thought I'd delegate it to last night,
> > failed to reproduce without the patch.  Try again tonight.
> > 
> > Thought I'd better respond despite inadequate testing, given the flaw
> > in the posted patch.  Hope the one below is flawless.
> > 
> 
> Thank you, I'll do test, too.

I confirm it fixes the bug: ran ten hours last night, when a couple
of tries just before without the patch each failed in ten minutes.

(But the load was not testing whether it keeps ownership when it should,
I hope you know a quick check on that: our earlier fixes should fail that.)

Hugh
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