linux-kernel - Re: Out of memory on 3.5 kernels

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Message-ID: <5061C8A2.1020605@oracle.com>
Date:	Tue, 25 Sep 2012 10:07:14 -0500
From:	Dave Kleikamp <dave.kleikamp@...cle.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Nico Schottelius <nico-kernel20120920@...ottelius.org>,
	Arend van Spriel <arend@...adcom.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	Dave Kleikamp <shaggy@...nel.org>,
	jfs-discussion@...ts.sourceforge.net
Subject: Re: Out of memory on 3.5 kernels

On 09/24/2012 05:43 PM, David Rientjes wrote:
> On Fri, 21 Sep 2012, Nico Schottelius wrote:
> 
>>  Active / Total Objects (% used)    : 1165130 / 1198087 (97.2%)
>>  Active / Total Slabs (% used)      : 81027 / 81027 (100.0%)
>>  Active / Total Caches (% used)     : 69 / 101 (68.3%)
>>  Active / Total Size (% used)       : 1237249.81K / 1246521.94K (99.3%)
>>  Minimum / Average / Maximum Object : 0.01K / 1.04K / 15.23K
>>
>>   OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME                   
>> 993607 993607 100%    1.21K  75358       26   2411456K jfs_ip
> 
> Well that doesn't look good.  100% of the inode cache for jfs are being 
> used which either means
> 
>  - there's a memory leak, or

maybe a missing iput() somewhere?

Nico, does unmounting the usb drive after killing the backup clean up
the jfs inode cache?

>  - there's some sort of throttling issue in jfs.
> 
> And those objects are consuming ~2.3GB of slab on your 4GB machine and 
> seems to only have occurred between v3.4.2 to v3.5.3.

Almost nothing in jfs has changed between these releases. Only this:

vfs: Rename end_writeback() to clear_inode()

> It would be interesting to see what kmemleak would tell us.
> 
> Adding Dave Kleikamp to the cc.
> 
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