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

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Date:	29 Nov 2012 09:54:14 -0500
From:	"George Spelvin" <linux@...izon.com>
To:	linux@...izon.com, mgorman@...e.de
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

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!
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