From: Eric Sandeen <sandeen@sandeen.net>
To: Tap <tap@anti-paladin.com>, xfs@oss.sgi.com
Subject: Re: Exponential memory usage?
Date: Fri, 28 Mar 2014 20:24:24 -0500 [thread overview]
Message-ID: <533620C8.1010204@sandeen.net> (raw)
In-Reply-To: <DF4B0D0E-6D5A-4670-9301-A1DCD0EEAE6E@anti-paladin.com>
On 3/28/14, 12:53 PM, Tap wrote:
> I have a Linux CentOs-based (6.5) system, running Linux 3.10.29
> beneath xen 4.2.3-26 with a raid array as follows:
<snip>
> Anyway at some point the system had become unusable. Something as
> simple as:
>
> find /raid -type f -- or -- ls -lR /raid
>
> Would walk the entire system out of RAM. Looking at slabtop it looks
> like this is due mostly to xfs_inode memory usage. Note that since
> these problems began I stopped running all sub-ordinate domains and
> am now only running dom0. In fact I've allocated all 32 GB to that
> domain, and memory problems still persist.
Out of? Did the OOM-killer actually show up, or did you simply see
memory usage rise?
The dcache is tenacious. dentries are cached pretty aggressively, and
those in turn will pin the vfs/xfs inodes.
But memory is there to be used; unless you actually see problems,
then the system is likely working as it should be.
<snip>
> Note: FWIW Un-mounting the filesystem also recovers the memory.
Yep, that would clear out the cache.
-Eric
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prev parent reply other threads:[~2014-03-29 1:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-28 17:53 Exponential memory usage? Tap
2014-03-28 20:09 ` Stefan Ring
2014-03-29 1:03 ` Stan Hoeppner
2014-03-29 1:24 ` Eric Sandeen [this message]
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