linux-kernel - Re: [RFC 1/2] aio: async readahead

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Date:	Fri, 19 Sep 2014 04:26:12 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	Milosz Tanski <milosz@...in.com>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	Volker Lendecke <Volker.Lendecke@...net.de>,
	Tejun Heo <tj@...nel.org>, Jeff Moyer <jmoyer@...hat.com>,
	Andreas Dilger <adilger@...ger.ca>
Subject: Re: [RFC 1/2] aio: async readahead

Requiring the block mappings to be entirely async is why we never went
for full buffered aio.  What would seem more useful is to offload all
readahead to workqueues to make sure they never block the caller for
sys_readahead or if we decide to readahead for the nonblocking read.

I tried to implement this, but I couldn't find a good place to hang
the work_struct for it off.  If we decide to dynamically allocate
the ra structure separate from struct file that might be an obvious
place.
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