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| author | Jens Axboe <jens.axboe@oracle.com> | 2009-03-27 10:30:47 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-04-07 08:12:37 +0200 |
| commit | 6c7e8cee6a9128eeb7f83c3ad1cb243f77f5cb16 (patch) | |
| tree | f57ac6ab9e57a4e3317a54d04c39151d3bb942cf /block/blk.h | |
| parent | d508afb437daee7cf07da085b635c44a4ebf9b38 (diff) | |
| download | lwn-6c7e8cee6a9128eeb7f83c3ad1cb243f77f5cb16.tar.gz lwn-6c7e8cee6a9128eeb7f83c3ad1cb243f77f5cb16.zip | |
block: elevator quiescing helpers
Simple helper functions to quiesce the request queue. These are
currently only used for switching IO schedulers on-the-fly, but
we can use them to properly switch IO accounting on and off as well.
Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk.h')
| -rw-r--r-- | block/blk.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk.h b/block/blk.h index 3ee94358b43d..22043c2886c7 100644 --- a/block/blk.h +++ b/block/blk.h @@ -70,6 +70,10 @@ void blk_queue_congestion_threshold(struct request_queue *q); int blk_dev_init(void); +void elv_quisce_start(struct request_queue *q); +void elv_quisce_end(struct request_queue *q); + + /* * Return the threshold (number of used requests) at which the queue is * considered to be congested. It include a little hysteresis to keep the |