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

[Klaus Dittrich]

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 .."
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