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

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Message-ID: <x498vc683eq.fsf@segfault.boston.devel.redhat.com>
Date:	Wed, 19 Sep 2012 10:59:09 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	jaxboe@...ionio.com
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] block: make struct block_device cacheline_aligned

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
>
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