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

[Andrew Morton]

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.

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