tree 683d07005d06c3e25bbec25b910567275f0bb9d1
parent c3b92c8787367a8bb53d57d9789b558f1295cc96
author Mandeep Singh Baines <msb@chromium.org> 1320092330 +0000
committer Alasdair G Kergon <agk@redhat.com> 1320092330 +0000

dm table: propagate non rotational flag

Allow QUEUE_FLAG_NONROT to propagate up the device stack if all
underlying devices are non-rotational.  Tools like ureadahead will
schedule IOs differently based on the rotational flag.

With this patch, I see boot time go from 7.75 s to 7.46 s on my device.

Suggested-by: J. Richard Barnette <jrbarnette@chromium.org>
Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Jens Axboe <jaxboe@fusionio.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: dm-devel@redhat.com
Signed-off-by: Alasdair G Kergon <agk@redhat.com>