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block: add q->nr_rqs[] and move q->rq.elvpriv to q->nr_rqs_elvpriv

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Add q->nr_rqs[] which currently behaves the same as q->rq.count[] and
move q->rq.elvpriv to q->nr_rqs_elvpriv.  blk_drain_queue() is updated
to use q->nr_rqs[] instead of q->rq.count[].

These counters separates queue-wide request statistics from the
request list and allow implementation of per-queue request allocation.

While at it, properly indent fields of struct request_list.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2012-06-04 20:40:58 -07:00 • committed by Jens Axboe
commit 8a5ecdd428
2 changed files with 13 additions and 11 deletions
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11
include/linux/blkdev.h
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@ -51,11 +51,10 @@ struct request_list {
* count[], starved[], and wait[] are indexed by
* BLK_RW_SYNC/BLK_RW_ASYNC
*/
int count[2];
int starved[2];
int elvpriv;
mempool_t *rq_pool;
wait_queue_head_t wait[2];
int count[2];
int starved[2];
mempool_t *rq_pool;
wait_queue_head_t wait[2];
};
/*
@ -282,6 +281,8 @@ struct request_queue {
struct list_head queue_head;
struct request *last_merge;
struct elevator_queue *elevator;
int nr_rqs[2]; /* # allocated [a]sync rqs */
int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
/*
* the queue request freelist, one for reads and one for writes