linux-kernel - Re: kswapd craziness in 3.7

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Message-ID: <50C0F55F.6030405@redhat.com>
Date:	Thu, 06 Dec 2012 14:43:27 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Bruno Wolff III <bruno@...ff.to>,
	Johannes Weiner <hannes@...xchg.org>,
	Thorsten Leemhuis <fedora@...mhuis.info>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	George Spelvin <linux@...izon.com>,
	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>,
	Tomas Racek <tracek@...hat.com>, Jan Kara <jack@...e.cz>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Josh Boyer <jwboyer@...il.com>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Jiri Slaby <jslaby@...e.cz>,
	Zdenek Kabelac <zkabelac@...hat.com>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	John Ellson <john.ellson@...cast.net>
Subject: Re: kswapd craziness in 3.7

On 12/06/2012 02:31 PM, Linus Torvalds wrote:
> Ok, people seem to be reporting success.
>
> I've applied Johannes' last patch with the new tested-by tags.
>
> Johannes (or anybody else, for that matter), please holler LOUDLY if
> you disagreed.. (or if I used the wrong version of the patch, there's
> been several, afaik).

Johannes's patch is a fairly big hammer, with kswapd not looping
back to the start when zones are still unbalanced.

However, the next allocation will wake up kswapd again, and
having kswapd stop early beats having it in an infinite loop.

I believe Johannes's patch will be fine for 3.7.

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