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author | Vasily Tarasov <vtaras@openvz.org> | 2007-07-20 10:06:38 +0200 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2007-07-20 10:06:38 +0200 |
commit | c2dea2d1fdbce86942dba0a968c523d8b7858bb5 (patch) | |
tree | c876b93785ee3b25c341be0dd5080a5176f27736 /block/cfq-iosched.c | |
parent | 9a79b2274186fade17134929d4f85b70d59a3840 (diff) | |
download | linux-c2dea2d1fdbce86942dba0a968c523d8b7858bb5.tar.bz2 |
cfq: async queue allocation per priority
If we have two processes with different ioprio_class, but the same
ioprio_data, their async requests will fall into the same queue. I guess
such behavior is not expected, because it's not right to put real-time
requests and best-effort requests in the same queue.
The attached patch fixes the problem by introducing additional *cfqq
fields on cfqd, pointing to per-(class,priority) async queues.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r-- | block/cfq-iosched.c | 56 |
1 files changed, 44 insertions, 12 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 9755a3cfad26..bc7190eed10d 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -92,7 +92,11 @@ struct cfq_data { struct cfq_queue *active_queue; struct cfq_io_context *active_cic; - struct cfq_queue *async_cfqq[IOPRIO_BE_NR]; + /* + * async queue for each priority case + */ + struct cfq_queue *async_cfqq[2][IOPRIO_BE_NR]; + struct cfq_queue *async_idle_cfqq; struct timer_list idle_class_timer; @@ -1414,24 +1418,44 @@ out: return cfqq; } +static struct cfq_queue ** +cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio) +{ + switch(ioprio_class) { + case IOPRIO_CLASS_RT: + return &cfqd->async_cfqq[0][ioprio]; + case IOPRIO_CLASS_BE: + return &cfqd->async_cfqq[1][ioprio]; + case IOPRIO_CLASS_IDLE: + return &cfqd->async_idle_cfqq; + default: + BUG(); + } +} + 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); + const int ioprio_class = task_ioprio_class(tsk); + struct cfq_queue **async_cfqq = NULL; struct cfq_queue *cfqq = NULL; - if (!is_sync) - cfqq = cfqd->async_cfqq[ioprio]; + if (!is_sync) { + async_cfqq = cfq_async_queue_prio(cfqd, ioprio_class, ioprio); + cfqq = *async_cfqq; + } + 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]) { + if (!is_sync && !(*async_cfqq)) { atomic_inc(&cfqq->ref); - cfqd->async_cfqq[ioprio] = cfqq; + *async_cfqq = cfqq; } atomic_inc(&cfqq->ref); @@ -2042,11 +2066,24 @@ static void cfq_shutdown_timer_wq(struct cfq_data *cfqd) blk_sync_queue(cfqd->queue); } +static void cfq_put_async_queues(struct cfq_data *cfqd) +{ + int i; + + for (i = 0; i < IOPRIO_BE_NR; i++) { + if (cfqd->async_cfqq[0][i]) + cfq_put_queue(cfqd->async_cfqq[0][i]); + if (cfqd->async_cfqq[1][i]) + cfq_put_queue(cfqd->async_cfqq[1][i]); + if (cfqd->async_idle_cfqq) + cfq_put_queue(cfqd->async_idle_cfqq); + } +} + 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); @@ -2063,12 +2100,7 @@ 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]); + cfq_put_async_queues(cfqd); spin_unlock_irq(q->queue_lock); |