linux-kernel - Re: [patch] block: make struct block_device cacheline

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Message-ID: <Pine.LNX.4.64.1209191116240.30172@file.rdu.redhat.com>
Date:	Wed, 19 Sep 2012 11:16:51 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Jeff Moyer <jmoyer@...hat.com>
cc:	jaxboe@...ionio.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] block: make struct block_device cacheline_aligned



On Wed, 19 Sep 2012, Jeff Moyer wrote:

> Jeff Moyer <jmoyer@...hat.com> writes:
> 
> > Hi,
> >
> > When testing against a pcie ssd or a ramdisk, making the block device
> > structure cacheline_aligned provided a significant increase in
> > performance:
> 
> Self-NACK on this one.  This results in a ton of warnings:
> 
> include/linux/fs.h:727: warning: ???__section__??? attribute does not
> apply to types
> In file included from include/linux/debugfs.h:18,
>                  from kernel/trace/trace_probe.h:28,
>                  from kernel/trace/trace_kprobe.c:23:
> include/linux/fs.h:727: warning: ???__section__??? attribute does not
> apply to types
> 
> And that leaves me with the task of figuring out if/why this actually
> helps.
> 
> Cheers,
> Jeff

Hi

Use ____cacheline_aligned instead of __cacheline_aligned

Mikulas
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