Re: dentry cache leak? Re: rsync out of memory 2.6.8-rc2

Klaus Dittrich
2004-07-27T21:06:35Z

Klaus Dittrich wrote:

> Jan-Frode Myklebust wrote:
>
>> On Mon, Jul 26, 2004 at 11:39:34PM +0200, Klaus Dittrich wrote:
>>
>>
>>>>> cat /proc/sys/vm/vfs_cache_pressure shows 100.
>>>>>
>>>>
>>
>> What about trying to increase the vfs_cache_pressure which seemed
>> to solve what to me looks like a similar problem:
>>
>> http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&safe=off&threadm=2m9Oo-Oo-17%40gated-at.bofh.it&rnum=1&prev=/groups%3Fhl%3Den%26ie%3DUTF-8%26safe%3Doff%26q%3Djan%2Bfrode%2Boom%2Bdsmc%26spell%3D1
>>
>>
>> http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&safe=off&threadm=2mdfi-3cC-11%40gated-at.bofh.it&rnum=2&prev=/groups%3Fq%3Djanfrode%2Boom%2Bdsmc%26ie%3DUTF-8%26hl%3Den%26btnG%3DGoogle%2BSearch
>>
>>
>>
>> -jf
>>
>>
> I did a test with a value of 500. echo 500 >
> /proc/sys/vm/vfs_cache_pressure.
>
> The highest numbers a cat /proc/sys/fs/dentry-state then showed during
> a du -s were
> 780721 750505 45 0 0 0
>
> The system survied. No processes were killed.
>
> With vfs_cache_pressure=100 a cat /proc/sys/fs/dentry-state showed
> numbers of about 1090000 before processes got killed.
>
> Hope that helps to narrow the region to look for what has changed.
>
PS. Two concurrent du -s however "kernel: Out of Memory: Killed process .."