linux-kernel - Re: [PATCH v5 1/5] fs: direct-io: don't dirtying pages for ITER_BVEC/ITER

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Date:	Wed, 10 Jun 2015 00:35:26 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Jens Axboe <axboe@...nel.dk>, Zach Brown <zab@...bo.net>,
	Christoph Hellwig <hch@...radead.org>,
	Maxim Patlasov <mpatlasov@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Tejun Heo <tj@...nel.org>, Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH v5 1/5] fs: direct-io: don't dirtying pages for
 ITER_BVEC/ITER_KVEC direct read

On Tue, Jun 09, 2015 at 09:49:22PM +0800, Ming Lei wrote:
> When direct read IO is submitted from kernel, it is often
> unnecessary to dirty pages, for example of loop, dirtying pages
> have been considered in the upper filesystem(over loop) side
> already, and they don't need to be dirtied again.
> 
> So this patch doesn't dirtying pages for ITER_BVEC/ITER_KVEC
> direct read, and loop should be the 1st case to use ITER_BVEC/ITER_KVEC
> for direct read I/O.
> 
> The patch is based on previous Dave's patch.

Looks good, thanks!

Reviewed-by: Christoph Hellwig <hch@....de>
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