linux-kernel - Re: [PATCH 0/4] slab: implement byte sized indexes for the freelist of a slab

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Message-ID: <20130904083305.GC16355@lge.com>
Date:	Wed, 4 Sep 2013 17:33:05 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] slab: implement byte sized indexes for the freelist
 of a slab

On Tue, Sep 03, 2013 at 02:15:42PM +0000, Christoph Lameter wrote:
> On Mon, 2 Sep 2013, Joonsoo Kim wrote:
> 
> > This patchset implements byte sized indexes for the freelist of a slab.
> >
> > Currently, the freelist of a slab consist of unsigned int sized indexes.
> > Most of slabs have less number of objects than 256, so much space is wasted.
> > To reduce this overhead, this patchset implements byte sized indexes for
> > the freelist of a slab. With it, we can save 3 bytes for each objects.
> >
> > This introduce one likely branch to functions used for setting/getting
> > objects to/from the freelist, but we may get more benefits from
> > this change.
> >
> > Below is some numbers of 'cat /proc/slabinfo' related to my previous posting
> > and this patchset.
> 
> You  may also want to run some performance tests. The cache footprint
> should also be reduced with this patchset and therefore performance should
> be better.

Yes, I did a hackbench test today, but I'm not ready for posting it.
The performance is improved for my previous posting and futher improvement is
founded by this patchset. Perhaps I will post it tomorrow.

Thanks.
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