linux-kernel - Re: kswapd craziness in 3.7

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Message-ID: <20121204214210.GB20253@cmpxchg.org>
Date:	Tue, 4 Dec 2012 16:42:10 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Thorsten Leemhuis <fedora@...mhuis.info>
Cc:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	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>,
	Bruno Wolff III <bruno@...ff.to>,
	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 Mon, Dec 03, 2012 at 02:42:08PM -0500, Johannes Weiner wrote:
> On Mon, Dec 03, 2012 at 09:30:12AM +0100, Thorsten Leemhuis wrote:
> > >> John was able to reproduce the problem quickly with a kernel that 
> > >> contained the patch from your mail. For details see
> > >
> > > [stripped: all the glory details of what likely went wrong and lead
> > > to the problem john sees or saw]
> > >
> > > ---
> > > From: Johannes Weiner <hannes@...xchg.org>
> > > Subject: [patch] mm: vmscan: do not keep kswapd looping forever due
> > >  to individual uncompactable zones
> > > 
> > > When a zone meets its high watermark and is compactable in case of
> > > higher order allocations, it contributes to the percentage of the
> > > node's memory that is considered balanced.
> > > [...]
> > 
> > FYI: I built a kernel with that patch. I've been running on my x86_64
> > machine at home over the weekend and everything was working fine (just
> > as without the patch). John gave it a quick try and in
> > https://bugzilla.redhat.com/show_bug.cgi?id=866988#c57 reported:
> > 
> > """
> > I just installed
> > kernel-3.7.0-0.rc7.git1.2.van.main.knurd.kswap.4.fc18.i686 and ran my
> > usual load that triggers the problem.  OK so far.  I'll check again in
> > 24hours, but looking good so far.
> > """
> 
> w00t!

Update from John in the BZ
(https://bugzilla.redhat.com/show_bug.cgi?id=866988#c62):

"Good news.

I've now been running both
  kernel-3.7.0-0.rc7.git1.2.van.main.knurd.kswap.4.fc18.i686
and
  kernel-3.7.0-0.rc7.git1.2.van.main.knurd.kswap.4.fc18.x86_64
for over 24hours with no evidence of problems with kswapd"

Now waiting for results from Jiri, Zdenek and Bruno...
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