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SubjectRe: 12 way dbench analysis: 2.5.9, dalloc and fastwalkdcache

Hi Hanna,

> Thanks Anton for running this. The data on your website will be very
> useful to me. I fixed one problem and put the patch up on sourceforge.
> undo_locked() called dget() while holding the dcache_lock instead of
> dget_locked() which is designed to be called with the dcache_lock
> held.
>
> This patch is against 2.5.8 at:
> http://prdownloads.sf.net/lse/fast_walkA1-2.5.8.patch
>
> However, I recently found a deadlock that no one else has been able
> to reproduce. Could you try doing a find on /proc and tell me if it
> deadlocks?

Indeed that does deadlock, I'll give the new patch a go (with Pauls
undo_locked suggestion). I did get a dcache BUG() when I tried an SDET
run (lost the details unfortunately) but I'll try to reproduce it with
this patch.

Anton
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