linux-kernel - Re: [PATCH] cfq: reorder cfq_queue removing padding on 64bit & allowing more objects/slab in it's kmem

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Date:	Mon, 15 Feb 2010 15:32:18 +0000
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cfq: reorder cfq_queue removing padding on 64bit &
 allowing more objects/slab in it's kmem_cache

On Mon, 2010-02-15 at 09:16 -0500, Vivek Goyal wrote:
> On Mon, Feb 15, 2010 at 02:10:36PM +0000, Richard Kennedy wrote:
> > This removes 8 bytes of padding from struct cfq_queue on 64 bit builds,
> > shrinking it's size to 256 bytes, so fitting into 1 fewer cachelines and
> > allowing 1 more object/slab in it's kmem_cache.
> >  
> > 
> > Signed-off-by: Richard Kennedy <richard@....demon.co.uk>
> > ----
> > patch against 2.6.33-rc8
> > tested on x86_64 AMDX2
> > 
> > regards
> > Richard
> > 
> > 
> > diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> > index 023f4e6..db4c127 100644
> > --- a/block/cfq-iosched.c
> > +++ b/block/cfq-iosched.c
> > @@ -116,10 +116,10 @@ struct cfq_queue {
> >  	unsigned long dispatch_start;
> >  	unsigned int allocated_slice;
> >  	/* time when first request from queue completed and slice started. */
> > +	unsigned int slice_dispatch;
> 
> Can you move it above the comment. The comment describes "slice_start" and
> now comment and variable have been separated.
> 
> Vivek
Sure, no problem. I'll send out a new version.
Richard

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