Re: dentry_cache using up all my zone normal memory -- also seen on 2.6.14-rc2

Dipankar Sarma
2005-09-22T19:23:59Z

On Thu, Sep 22, 2005 at 01:03:17PM -0600, Christopher Friesen wrote:
> Dipankar Sarma wrote:
>
> >This can happen if a task runs for too long inside the kernel
> >holding up context switches or usermode code running on that
> >cpu. The fact that RCU grace period eventually happens
> >and the dentries are freed means that something intermittently
> >holds up RCU. Is this 2.6.10 vanilla or does it have other
> >patches in there ?
>
> The 2.6.10 was modified. All the results with the dcache debugging
> patch applied were from vanilla 2.6.14-rc2.
>
> It's perfectly repeatable as well...every single time I run "rename14"
> the OOM killer kicks in.

Can you look at that each cpu is running (backtrace) using
sysrq ? That may tell us what is holding up RCU. I will look
at it myself later.

Thanks
Dipankar