linux-kernel - Re: Sudden and massive page cache eviction

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Message-ID: <1290501502.2390.7029.camel@nimitz>
Date:	Tue, 23 Nov 2010 00:38:22 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Peter Schüller <scode@...tify.com>,
	linux-kernel@...r.kernel.org,
	Mattias de Zalenski <zalenski@...tify.com>,
	linux-mm@...ck.org
Subject: Re: Sudden and massive page cache eviction

On Mon, 2010-11-22 at 16:11 -0800, Andrew Morton wrote:
> > This latest observation we understand may be due to NUMA related
> > allocation issues, and we should probably try to use numactl to ask
> > for a more even allocation. We have not yet tried this. However, it
> is not clear how any issues having to do with that would cause sudden
> > eviction of data already *in* the page cache (on whichever node). 

You don't have anybody messing with /proc/sys/vm/drop_caches, do you?

That can cause massive, otherwise unprovoked page cache eviction.  

-- Dave

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