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Re: 2.6.39-rc4+: oom-killer busy killing tasks

To: Minchan Kim <minchan.kim@xxxxxxxxx>
Subject: Re: 2.6.39-rc4+: oom-killer busy killing tasks
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 28 Apr 2011 09:56:58 +1000
Cc: Christian Kujau <lists@xxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <BANLkTimDoZueDWqB_LBndqPorCnTOZkNYQ@xxxxxxxxxxxxxx>
References: <alpine.DEB.2.01.1104211841510.18728@xxxxxxxxxxxxxx> <20110424234655.GC12436@dastard> <alpine.DEB.2.01.1104242245090.18728@xxxxxxxxxxxxxx> <alpine.DEB.2.01.1104250015480.18728@xxxxxxxxxxxxxx> <20110427022655.GE12436@dastard> <alpine.DEB.2.01.1104270042510.18728@xxxxxxxxxxxxxx> <20110427102824.GI12436@dastard> <BANLkTimDoZueDWqB_LBndqPorCnTOZkNYQ@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Thu, Apr 28, 2011 at 08:16:29AM +0900, Minchan Kim wrote:
> On Wed, Apr 27, 2011 at 7:28 PM, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
> > On Wed, Apr 27, 2011 at 12:46:51AM -0700, Christian Kujau wrote:
> >> On Wed, 27 Apr 2011 at 12:26, Dave Chinner wrote:
> >> > What this shows is that VFS inode cache memory usage increases until
> >> > about the 550 sample mark before the VM starts to reclaim it with
> >> > extreme prejudice. At that point, I'd expect the XFS inode cache to
> >> > then shrink, and it doesn't. I've got no idea why the either the
> >>
> >> Do you remember any XFS changes past 2.6.38 that could be related to
> >> something like this?
> >
> > There's plenty of changes that coul dbe the cause - we've changed
> > the inode reclaim to run in the background out of a workqueue as
> > well as via the shrinker, so it could even be workqueue starvation
> > causing the the problem...
> RCU free starvation is another possibility?
> https://lkml.org/lkml/2011/4/25/124

You know, I've been waching that thread with interest, but it didn't
seem to be related. However, now that I go look at the config file
provided, I see:

# CONFIG_SMP is not set

which means it probably is the same rcu free starvation problem as
reported in that thread.


Dave Chinner

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