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Date: Sat, 3 Nov 2007 19:09:57 +0000 (GMT) From: Hugh Dickins <hugh@...itas.com> To: Christoph Lameter <clameter@....com> cc: Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/2] slub: fix Objects count On Sat, 3 Nov 2007, Christoph Lameter wrote: > 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. I was afraid you might say something like that. Perhaps it'll be a patch I need to use in my own builds. Though I'd have thought others would want that accuracy too. Didn't SLAB give it? (The "r*gr*ss**n" word!) > > 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 You've come to that conclusion very quickly! Any numbers to back it up? > and will make the current optimizations in mm impossible. I'll have to wait and see what those are: you move too fast for me. Hugh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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