diff options
| author | Shaohua Li <shli@fb.com> | 2015-01-23 14:18:00 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-01-23 14:18:00 -0700 |
| commit | 24391c0dc57c3756a219defaa781e68637d6ab7d (patch) | |
| tree | 4d0e5b213c017e622d69d916c9e13e7f6e805368 /drivers/scsi/scsi_lib.c | |
| parent | ee1b6f7aff94019c09e73837054979063f722046 (diff) | |
| download | lwn-24391c0dc57c3756a219defaa781e68637d6ab7d.tar.gz lwn-24391c0dc57c3756a219defaa781e68637d6ab7d.zip | |
blk-mq: add tag allocation policy
This is the blk-mq part to support tag allocation policy. The default
allocation policy isn't changed (though it's not a strict FIFO). The new
policy is round-robin for libata. But it's a try-best implementation. If
multiple tasks are competing, the tags returned will be mixed (which is
unavoidable even with !mq, as requests from different tasks can be
mixed in queue)
Cc: Jens Axboe <axboe@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 9ea95dd3e260..49ab11508286 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2188,6 +2188,8 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost) shost->tag_set.cmd_size = cmd_size; shost->tag_set.numa_node = NUMA_NO_NODE; shost->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; + shost->tag_set.flags |= + BLK_ALLOC_POLICY_TO_MQ_FLAG(shost->hostt->tag_alloc_policy); shost->tag_set.driver_data = shost; return blk_mq_alloc_tag_set(&shost->tag_set); |