linux-kernel - Re: [PATCH 2/2] slub: fix Objects count

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Message-ID: <Pine.LNX.4.64.0711031125090.5395@schroedinger.engr.sgi.com>
Date:	Sat, 3 Nov 2007 11:26:55 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Hugh Dickins <hugh@...itas.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, 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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