From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Peter Schüller" <scode@spotify.com>,
linux-kernel@vger.kernel.org,
"Mattias de Zalenski" <zalenski@spotify.com>,
linux-mm@kvack.org
Subject: Re: Sudden and massive page cache eviction
Date: Tue, 23 Nov 2010 00:38:22 -0800 [thread overview]
Message-ID: <1290501502.2390.7029.camel@nimitz> (raw)
In-Reply-To: <20101122161158.02699d10.akpm@linux-foundation.org>
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
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Peter Schüller" <scode@spotify.com>,
linux-kernel@vger.kernel.org,
"Mattias de Zalenski" <zalenski@spotify.com>,
linux-mm@kvack.org
Subject: Re: Sudden and massive page cache eviction
Date: Tue, 23 Nov 2010 00:38:22 -0800 [thread overview]
Message-ID: <1290501502.2390.7029.camel@nimitz> (raw)
In-Reply-To: <20101122161158.02699d10.akpm@linux-foundation.org>
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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next prev parent reply other threads:[~2010-11-23 8:38 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-12 16:20 Sudden and massive page cache eviction Peter Schüller
2010-11-23 0:11 ` Andrew Morton
2010-11-23 0:11 ` Andrew Morton
2010-11-23 8:38 ` Dave Hansen [this message]
2010-11-23 8:38 ` Dave Hansen
2010-11-23 9:44 ` Peter Schüller
2010-11-23 9:44 ` Peter Schüller
2010-11-23 16:19 ` Dave Hansen
2010-11-23 16:19 ` Dave Hansen
2010-11-24 14:02 ` Peter Schüller
2010-11-24 14:02 ` Peter Schüller
2010-11-24 14:14 ` Peter Schüller
2010-11-24 14:14 ` Peter Schüller
2010-11-24 14:20 ` Pekka Enberg
2010-11-24 14:20 ` Pekka Enberg
2010-11-24 15:32 ` Peter Schüller
2010-11-24 15:32 ` Peter Schüller
2010-11-24 17:46 ` Pekka Enberg
2010-11-24 17:46 ` Pekka Enberg
2010-11-25 1:18 ` Simon Kirby
2010-11-25 1:18 ` Simon Kirby
2010-11-25 15:59 ` Peter Schüller
2010-11-25 15:59 ` Peter Schüller
2010-12-01 6:36 ` Simon Kirby
2010-12-01 6:36 ` Simon Kirby
2010-11-24 17:32 ` Dave Hansen
2010-11-24 17:32 ` Dave Hansen
2010-11-25 15:33 ` Peter Schüller
2010-11-25 15:33 ` Peter Schüller
2010-12-01 9:15 ` Simon Kirby
2010-12-01 9:15 ` Simon Kirby
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