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

[Christoph Lameter]

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.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/