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(parent: 288d914) | patch
dm: don't start current request if it would've merged with the previous
authorMike Snitzer <snitzer@redhat.com>
Wed, 25 Feb 2015 02:58:21 +0000 (21:58 -0500)
committerMike Snitzer <snitzer@redhat.com>
Wed, 15 Apr 2015 16:10:14 +0000 (12:10 -0400)
commite47611da387506129b515493b3ed5e278bcd3a05
treeccb44d9f929f34bb8cae746252e3a40246c9f895tree | snapshot
parent288d914275cfc3b4c6a664a217a130654bb3b9c8commit | diff
dm: don't start current request if it would've merged with the previous

Request-based DM's dm_request_fn() is so fast to pull requests off the
queue that steps need to be taken to promote merging by avoiding request
processing if it makes sense.

If the current request would've merged with previous request let the
current request stay on the queue longer.

Suggested-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
drivers/md/dm.c diff | blob | history
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