linux-kernel - Re: [PATCH 05/11] direct-io: only inc/dec inode->i_dio

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Message-ID: <20131024094713.GA17840@infradead.org>
Date:	Thu, 24 Oct 2013 02:47:13 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 05/11] direct-io: only inc/dec inode->i_dio_count for
 file systems

On Thu, Oct 24, 2013 at 10:46:00AM +0100, Jens Axboe wrote:
> On Thu, Oct 24 2013, Jens Axboe wrote:
> > We don't need truncate protection for block devices, so add a flag
> > bypassing this cache line dirtying twice for every IO. This easily
> > contributes to 5-10% of the CPU time on high IOPS O_DIRECT testing.
> 
> There's a merge error in this patch, please find the correct one below.

Btw, I think this patch should not go in with this series but rather via
the VFS tree as it's not related to the blk-mq infrastructure at all.

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