linux-kernel - Re: sysfs_dir_cache growing out of control

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Message-ID: <20070824005429.GA32265@kroah.com>
Date:	Thu, 23 Aug 2007 17:54:29 -0700
From:	Greg KH <greg@...ah.com>
To:	Joel Fuster <j@...ter.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: sysfs_dir_cache growing out of control

On Thu, Aug 23, 2007 at 08:44:10PM -0400, Joel Fuster wrote:
> Greg KH wrote:
>> On Wed, Aug 22, 2007 at 11:56:44PM -0400, Joel Fuster wrote:
>>> Joel Fuster wrote:
>>>> Hi,
>>>> I am running 2.6.22.3.  For reasons that escape me, over time (days) the 
>>>> sysfs_dir_cache, dentry, and inode_cache SLUB entries grow until they 
>>>> consume all the memory on my system, requiring a reboot.
>> Hm, those items should consume all the memory, but it should be freed if
>> you have memory pressure from other places.  Does it cause the machine
>> to lock up, or you just got scared when seeing them?
> Right.  The problem is that the memory never seems to get freed no matter 
> what I do.  I've tried setting /proc/sys/vm/vfs_cache_pressure to 10000, 
> but after a few days all my programs are running out of swap and I have to 
> reboot to get things back to a usable state.
>
>> Oh, and does the same thing happen if you do not use SLUB, but rather
>> the older SLAB?
>
> OK I just rebuilt 2.6.22.3 with SLAB and I seem to be getting the same 
> result..obviously I haven't waited several days, but 
> sysfs_dir_cache/dentry/inode_cache grow continuously when scanbuttond is 
> running, and stop growing when it isn't.

Do you have a pointer to the scanbuttond source code?  I'll try to take
a look at this tomorrow.

thanks,

greg k-h
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