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| 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 /block/blk-mq-tag.h | |
| parent | ee1b6f7aff94019c09e73837054979063f722046 (diff) | |
| download | linux-0-day-24391c0dc57c3756a219defaa781e68637d6ab7d.tar.gz linux-0-day-24391c0dc57c3756a219defaa781e68637d6ab7d.tar.xz | |
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 'block/blk-mq-tag.h')
| -rw-r--r-- | block/blk-mq-tag.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h index a6fa0fc9d41a2..90767b370308d 100644 --- a/block/blk-mq-tag.h +++ b/block/blk-mq-tag.h @@ -42,10 +42,12 @@ struct blk_mq_tags { struct request **rqs; struct list_head page_list; + + int alloc_policy; }; -extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node); +extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy); extern void blk_mq_free_tags(struct blk_mq_tags *tags); extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data); |