diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/cfq-iosched.c | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index baef5fc7cff..e0aa4dad674 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -92,6 +92,8 @@ struct cfq_data { struct cfq_queue *active_queue; struct cfq_io_context *active_cic; + struct cfq_queue *async_cfqq[IOPRIO_BE_NR]; + struct timer_list idle_class_timer; sector_t last_position; @@ -1351,8 +1353,8 @@ static void cfq_ioc_set_ioprio(struct io_context *ioc) } static struct cfq_queue * -cfq_get_queue(struct cfq_data *cfqd, int is_sync, struct task_struct *tsk, - gfp_t gfp_mask) +cfq_find_alloc_queue(struct cfq_data *cfqd, int is_sync, + struct task_struct *tsk, gfp_t gfp_mask) { struct cfq_queue *cfqq, *new_cfqq = NULL; struct cfq_io_context *cic; @@ -1405,12 +1407,35 @@ retry: if (new_cfqq) kmem_cache_free(cfq_pool, new_cfqq); - atomic_inc(&cfqq->ref); out: WARN_ON((gfp_mask & __GFP_WAIT) && !cfqq); return cfqq; } +static struct cfq_queue * +cfq_get_queue(struct cfq_data *cfqd, int is_sync, struct task_struct *tsk, + gfp_t gfp_mask) +{ + const int ioprio = task_ioprio(tsk); + struct cfq_queue *cfqq = NULL; + + if (!is_sync) + cfqq = cfqd->async_cfqq[ioprio]; + if (!cfqq) + cfqq = cfq_find_alloc_queue(cfqd, is_sync, tsk, gfp_mask); + + /* + * pin the queue now that it's allocated, scheduler exit will prune it + */ + if (!is_sync && !cfqd->async_cfqq[ioprio]) { + atomic_inc(&cfqq->ref); + cfqd->async_cfqq[ioprio] = cfqq; + } + + atomic_inc(&cfqq->ref); + return cfqq; +} + /* * We drop cfq io contexts lazily, so we may find a dead one. */ @@ -2019,6 +2044,7 @@ static void cfq_exit_queue(elevator_t *e) { struct cfq_data *cfqd = e->elevator_data; request_queue_t *q = cfqd->queue; + int i; cfq_shutdown_timer_wq(cfqd); @@ -2035,6 +2061,13 @@ static void cfq_exit_queue(elevator_t *e) __cfq_exit_single_io_context(cfqd, cic); } + /* + * Put the async queues + */ + for (i = 0; i < IOPRIO_BE_NR; i++) + if (cfqd->async_cfqq[i]) + cfq_put_queue(cfqd->async_cfqq[i]); + spin_unlock_irq(q->queue_lock); cfq_shutdown_timer_wq(cfqd); |