Messages in this thread |  | | From | Jens Axboe <> | Date | Tue, 1 Nov 2016 11:54:37 -0600 | Subject | Re: block device direct I/O fast path |
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On Tue, Nov 01 2016, Christoph Hellwig wrote: > On Tue, Nov 01, 2016 at 11:00:19AM -0600, Jens Axboe wrote: > > #2 is a bit more problematic, I'm pondering how we can implement that on > > top of the bio approach. The nice thing about the request based approach > > is that we have a 1:1 mapping with the unit on the driver side. And we > > have a place to store the timer. I don't particularly love the embedded > > timer, however, it'd be great to implement that differently. Trying to > > think of options there, haven't found any yet. > > I have a couple ideas for that. Give me a few weeks and I'll send > patches.
I'm not that patient :-)
For the SYNC part, it should be easy enough to do by just using an on-stack hrtimer. I guess that will do for now, since we don't have poll support for async O_DIRECT right now anyway.
http://git.kernel.dk/cgit/linux-block/commit/?h=for-4.10/dio&id=e96d9afd56791a61d463cb88f8f3b48393b71020
Untested, but should get the point across. I'll fire up a test box.
-- Jens Axboe
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