Re: [PATCH 2/2] slub: fix Objects count

From: Christoph Lameter
Date: Sat Nov 03 2007 - 14:27:07 EST

On Sat, 3 Nov 2007, Hugh Dickins wrote:

> The count of active Objects shown by Slub's slabinfo is too approximate,
> because each cpu slab is counted as all in use, even when lots are free.
> That makes tracing leaks harder than it need be.

True but that is the way it is for performance reasons.

> Add a free count into kmem_cache_cpu (which doesn't enlarge it on 64-bit),
> to keep that count in the hot and dirty per-cpu cacheline.

Adds to much overhead to the fast paths and will make the current
optimizations in mm impossible.

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