On Mon, 9 July 2007 09:29:38 +1000, David Chinner wrote:

On Sat, Jul 07, 2007 at 12:45:35PM +0200, JA?A?rn Engel wrote:

quoted

Oh certainly!  I should dust off my dcache_static patch.  Some dentries
are hands-off for the shrinker, basically mountpoints and tmpfs.  The
patch moves those to a seperate slab cache.

I doubt there's enough of those to make any difference - putting all
the directories into another slab did little to reduce fragmentation
(~18 months ago we tried that), so I don't think that this would help
at all...

Interesting.  I suspect that the de-facto random cache eviction has a
bigger effect and overshadows everything else.  So the decisive step
would be to nuke all dentries in a given slab.

It wouldn't surprise me if your patch did make a difference afterwards.
With 32 dentries per slab, it doesn't take many pinned objects to pin
most slabs.

JA?rn

-- 
All art is but imitation of nature.
-- Lucius Annaeus Seneca

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