linux-kernel - Re: 3.7-rc6 soft lockup in kswapd0

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Date:	Thu, 29 Nov 2012 15:20:51 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	George Spelvin <linux@...izon.com>
Cc:	dave@...ux.vnet.ibm.com, hannes@...xchg.org, jack@...e.cz,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, riel@...hat.com
Subject: Re: 3.7-rc6 soft lockup in kswapd0

On Thu, Nov 29, 2012 at 09:54:14AM -0500, George Spelvin wrote:
> Mel Gorman <mgorman@...e.de> wrote:
> > On Tue, Nov 27, 2012 at 04:25:14PM -0500, George Spelvin wrote:
> >> Well, it just made it to 24 hours, 
> >> it did before.  I'm going to wait a couple more days before declaring
> >> victory, but it looks good so far.
> >> 
> >>  19:19:10 up 1 day, 0 min,  2 users,  load average: 0.15, 0.20, 0.22
> >>  21:24:05 up 1 day,  2:05,  2 users,  load average: 0.25, 0.19, 0.18
> >
> > Superb. The relevant patches *should* be in flight for 3.7 assuming they
> > make it through the confusion of last-minute fixes.
> 
>  14:53:54 up 2 days, 19:35,  2 users,  load average: 0.20, 0.24, 0.23
> 
> Almost three days, when it wouldn't live overnight before.
> As promised, I'm declaring victory.
> 
> The patch that worked (on top of -rc7) was Johannes Weiner's
> "mm: vmscan: fix endless loop in kswapd balancing"
> that added the zone_balanced() function to mm/vmscan.c:2400.
> 
> Thank you all very much!

Excellent, thanks for getting back quickly. The necessary patches in
question are sortof-in-flight but I expect they'll make it in for 3.7.
If that happens, it would be very nice if you could test with 3.7 to confirm
and if all goes according to plan, I'll do a backport for 3.6-stable and
hopefully squash most of the THP-causes-all-and-sundry-to-go-nuts bugs.


-- 
Mel Gorman
SUSE Labs
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