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

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Message-ID: <20131024094948.GT14598@kernel.dk>
Date:	Thu, 24 Oct 2013 10:49:48 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-kernel@...r.kernel.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, Christoph Hellwig wrote:
> 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.

That'd be fine with me, if Al could pick it up if he agrees with it.
Feel free to add an acked/review-by :-)

-- 
Jens Axboe

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