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From: Christoph Lameter on 9 Jul 2010 10:10
On Fri, 9 Jul 2010, KOSAKI Motohiro wrote:

> If number of reclaimable slabs are zero, shrink_icache_memory() and
> shrink_dcache_memory() return 0. but strangely shrink_slab() ignore
> it and continue meaningless loop iteration.

There is also a per zone/node/global counter SLAB_RECLAIM_ACCOUNT that
could be used to determine if its worth looking at things at all. I saw
some effort going into making the shrinkers zone aware. If so then we may
be able to avoid scanning slabs.
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