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block: only allocate/free mq_usage_counter in blk-mq 

The percpu counter is only used for blk-mq, so move
its allocation and free inside blk-mq, and don't
allocate it for legacy queue device.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2014-05-27 23:35:14 +08:00 committed by Jens Axboe
parent 624dbe4754
commit 3d2936f457
3 changed files with 6 additions and 8 deletions
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7
block/blk-core.c
View File

@ -576,12 +576,9 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
if (!q)
return NULL;
if (percpu_counter_init(&q->mq_usage_counter, 0))
goto fail_q;
q->id = ida_simple_get(&blk_queue_ida, 0, 0, gfp_mask);
if (q->id < 0)
goto fail_c;
goto fail_q;
q->backing_dev_info.ra_pages =
(VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
@ -639,8 +636,6 @@ fail_bdi:
bdi_destroy(&q->backing_dev_info);
fail_id:
ida_simple_remove(&blk_queue_ida, q->id);
fail_c:
percpu_counter_destroy(&q->mq_usage_counter);
fail_q:
kmem_cache_free(blk_requestq_cachep, q);
return NULL;

5
block/blk-mq.c
View File

@ -1781,6 +1781,9 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
if (!q)
goto err_hctxs;
if (percpu_counter_init(&q->mq_usage_counter, 0))
goto err_map;
q->mq_map = blk_mq_make_queue_map(set);
if (!q->mq_map)
goto err_map;
@ -1867,6 +1870,8 @@ void blk_mq_free_queue(struct request_queue *q)
blk_mq_exit_hw_queues(q, set, set->nr_hw_queues);
blk_mq_free_hw_queues(q, set);
percpu_counter_destroy(&q->mq_usage_counter);
free_percpu(q->queue_ctx);
kfree(q->queue_hw_ctx);
kfree(q->mq_map);

2
block/blk-sysfs.c
View File

@ -517,8 +517,6 @@ static void blk_release_queue(struct kobject *kobj)
if (q->queue_tags)
__blk_queue_free_tags(q);
percpu_counter_destroy(&q->mq_usage_counter);
if (q->mq_ops)
blk_mq_free_queue(q);