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| author |   Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-07-22 14:17:00 -0700 |
|---|---|---|
| committer |   Jens Axboe <jaxboe@fusionio.com> | 2010-08-07 18:52:53 +0200 |
| commit | 4dab46ff26c6003a13ec769312c50938b93c359d (patch) | |
| tree | 02d6f99222034dfeb73ccb388663570db883cb52 /kernel/debug/debug_core.c | |
| parent | scsi: use REQ_TYPE_FS for flush request (diff) | |
xen/blkfront: use tagged queuing for barriers
When barriers are supported, then use QUEUE_ORDERED_TAG to tell the block
subsystem that it doesn't need to do anything else with the barriers.
Previously we used ORDERED_DRAIN which caused the block subsystem to
drain all pending IO before submitting the barrier, which would be
very expensive.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'kernel/debug/debug_core.c')
0 files changed, 0 insertions, 0 deletions