linux-kernel - Re: 2.6.21 frozen for a few minutes, swapping to disk

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Message-Id: <20070430224911.ac989f40.akpm@linux-foundation.org>
Date:	Mon, 30 Apr 2007 22:49:11 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Miguel Figueiredo <elmig@...ianpt.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21 frozen for a few minutes, swapping to disk

On Tue, 01 May 2007 15:42:30 +1000 Nick Piggin <nickpiggin@...oo.com.au> wrote:

> > hm, a genuine oom on an all-ext3 data=ordered i386 system, just like a
> > million other people.  How very weird.
> > 
> > I assume all those pages on the LRU are pagecache pages which for some
> > reason we're unable to reclaim.
> 
> It looks like it used up all swap? I'd guess a memory leak in some
> application, or maybe a page refcount leak somewhere.

yes, I missed that.   The number of mapped pages is tiny so the thing has
been trying to swap out like.

The question is: how much memory is free after the oom-killing storm?
If it's "lots" then it's probably an application problem.  If it's
"not much" then perhaps there's a kernel leak.
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