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

[Klaus Dittrich]

Andrew Morton wrote:

> kladit@xxxxxxxxxxx (Klaus Dittrich) wrote:
>  
>
> > > Can you narrow the onset of the problem down to any particular kernel
> > >      
> > >snapshot?
> >
> > Did it and here is the answer.
> >
> > kernel-2.6.7 and bk's up to 2.6.7-bk7 survived a du -s,
> > kernels starting with 2.6.7-bk8 did not.
> >    
>
> Dammit, -bk7 to -bk8 is a 1.8M diff.  Relevant changes include the switch
> to the rcu callbacks (make them take an rcu_head* rather than a void*) and
> the introduction of /proc/sys/vm/vfs_cache_pressure.
>
> So the immediate question is: please check the contents of your
> vfs_cache_pressure tunable.  It should be 100.  A setting of zero would
> cause this behaviour.
>
>  
>
> > Compiler gcc-3.4.1 
> >    
>
> It would be useful to try a different compiler version.
>
> There's _something_ different in your setup.  If we can work out what this
> factor is, it will lead us to the bug.
>
>  

cat /proc/sys/vm/vfs_cache_pressure shows 100.
Should I try an older or newer compiler ?

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