diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/cfq-iosched.c | 18 | ||||
| -rw-r--r-- | block/ll_rw_blk.c | 28 |
2 files changed, 32 insertions, 14 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 78c6b312bd3..533a2938ffd 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -219,9 +219,12 @@ static int cfq_queue_empty(request_queue_t *q) return !cfqd->busy_queues; } -static inline pid_t cfq_queue_pid(struct task_struct *task, int rw) +static inline pid_t cfq_queue_pid(struct task_struct *task, int rw, int is_sync) { - if (rw == READ || rw == WRITE_SYNC) + /* + * Use the per-process queue, for read requests and syncronous writes + */ + if (!(rw & REQ_RW) || is_sync) return task->pid; return CFQ_KEY_ASYNC; @@ -473,7 +476,7 @@ static struct request * cfq_find_rq_fmerge(struct cfq_data *cfqd, struct bio *bio) { struct task_struct *tsk = current; - pid_t key = cfq_queue_pid(tsk, bio_data_dir(bio)); + pid_t key = cfq_queue_pid(tsk, bio_data_dir(bio), bio_sync(bio)); struct cfq_queue *cfqq; cfqq = cfq_find_cfq_hash(cfqd, key, tsk->ioprio); @@ -1748,6 +1751,9 @@ static int cfq_may_queue(request_queue_t *q, int rw) struct cfq_data *cfqd = q->elevator->elevator_data; struct task_struct *tsk = current; struct cfq_queue *cfqq; + unsigned int key; + + key = cfq_queue_pid(tsk, rw, rw & REQ_RW_SYNC); /* * don't force setup of a queue from here, as a call to may_queue @@ -1755,7 +1761,7 @@ static int cfq_may_queue(request_queue_t *q, int rw) * so just lookup a possibly existing queue, or return 'may queue' * if that fails */ - cfqq = cfq_find_cfq_hash(cfqd, cfq_queue_pid(tsk, rw), tsk->ioprio); + cfqq = cfq_find_cfq_hash(cfqd, key, tsk->ioprio); if (cfqq) { cfq_init_prio_data(cfqq); cfq_prio_boost(cfqq); @@ -1798,10 +1804,10 @@ cfq_set_request(request_queue_t *q, struct request *rq, gfp_t gfp_mask) struct task_struct *tsk = current; struct cfq_io_context *cic; const int rw = rq_data_dir(rq); - pid_t key = cfq_queue_pid(tsk, rw); + const int is_sync = rq_is_sync(rq); + pid_t key = cfq_queue_pid(tsk, rw, is_sync); struct cfq_queue *cfqq; unsigned long flags; - int is_sync = key != CFQ_KEY_ASYNC; might_sleep_if(gfp_mask & __GFP_WAIT); diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index a541b42c08e..79807dbc306 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -2058,15 +2058,16 @@ static void freed_request(request_queue_t *q, int rw, int priv) * Returns NULL on failure, with queue_lock held. * Returns !NULL on success, with queue_lock *not held*. */ -static struct request *get_request(request_queue_t *q, int rw, struct bio *bio, - gfp_t gfp_mask) +static struct request *get_request(request_queue_t *q, int rw_flags, + struct bio *bio, gfp_t gfp_mask) { struct request *rq = NULL; struct request_list *rl = &q->rq; struct io_context *ioc = NULL; + const int rw = rw_flags & 0x01; int may_queue, priv; - may_queue = elv_may_queue(q, rw); + may_queue = elv_may_queue(q, rw_flags); if (may_queue == ELV_MQUEUE_NO) goto rq_starved; @@ -2114,7 +2115,7 @@ static struct request *get_request(request_queue_t *q, int rw, struct bio *bio, spin_unlock_irq(q->queue_lock); - rq = blk_alloc_request(q, rw, priv, gfp_mask); + rq = blk_alloc_request(q, rw_flags, priv, gfp_mask); if (unlikely(!rq)) { /* * Allocation failed presumably due to memory. Undo anything @@ -2162,12 +2163,13 @@ out: * * Called with q->queue_lock held, and returns with it unlocked. */ -static struct request *get_request_wait(request_queue_t *q, int rw, +static struct request *get_request_wait(request_queue_t *q, int rw_flags, struct bio *bio) { + const int rw = rw_flags & 0x01; struct request *rq; - rq = get_request(q, rw, bio, GFP_NOIO); + rq = get_request(q, rw_flags, bio, GFP_NOIO); while (!rq) { DEFINE_WAIT(wait); struct request_list *rl = &q->rq; @@ -2175,7 +2177,7 @@ static struct request *get_request_wait(request_queue_t *q, int rw, prepare_to_wait_exclusive(&rl->wait[rw], &wait, TASK_UNINTERRUPTIBLE); - rq = get_request(q, rw, bio, GFP_NOIO); + rq = get_request(q, rw_flags, bio, GFP_NOIO); if (!rq) { struct io_context *ioc; @@ -2910,6 +2912,7 @@ static int __make_request(request_queue_t *q, struct bio *bio) int el_ret, nr_sectors, barrier, err; const unsigned short prio = bio_prio(bio); const int sync = bio_sync(bio); + int rw_flags; nr_sectors = bio_sectors(bio); @@ -2984,10 +2987,19 @@ static int __make_request(request_queue_t *q, struct bio *bio) get_rq: /* + * This sync check and mask will be re-done in init_request_from_bio(), + * but we need to set it earlier to expose the sync flag to the + * rq allocator and io schedulers. + */ + rw_flags = bio_data_dir(bio); + if (sync) + rw_flags |= REQ_RW_SYNC; + + /* * Grab a free request. This is might sleep but can not fail. * Returns with the queue unlocked. */ - req = get_request_wait(q, bio_data_dir(bio), bio); + req = get_request_wait(q, rw_flags, bio); /* * After dropping the lock and possibly sleeping here, our request |