I just experienced this problem on UP with 513M memory.  About 400m was 
locked in dentries.  The system was very unresponsive - suspect it was
spending gobs of time scaning unfreeable dentries.  This was with -mm3
up about 24 hours.

The inode caches looked sane.  Just the dentries were out of wack.

I think you want this:

+read-barrier-depends.patch
 RCU fix

Which is only in mm4 I believe. Wanna retest? mm4 is the first 44-mmX
that works for me ... seems to have quite a few bugfixes ;-)

M.

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