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[PATCH] keep sync and async cfq_queue separate

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2006-03-18 13:38:01 -05:00
parent 478a82b0ed
commit 12a0573215
2 changed files with 27 additions and 11 deletions
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36
block/cfq-iosched.c
View File

@ -1219,11 +1219,20 @@ static void cfq_exit_single_io_context(struct cfq_io_context *cic)
spin_lock(q->queue_lock);
if (unlikely(cic->cfqq == cfqd->active_queue))
__cfq_slice_expired(cfqd, cic->cfqq, 0);
if (cic->cfqq[ASYNC]) {
if (unlikely(cic->cfqq[ASYNC] == cfqd->active_queue))
__cfq_slice_expired(cfqd, cic->cfqq[ASYNC], 0);
cfq_put_queue(cic->cfqq[ASYNC]);
cic->cfqq[ASYNC] = NULL;
}
if (cic->cfqq[SYNC]) {
if (unlikely(cic->cfqq[SYNC] == cfqd->active_queue))
__cfq_slice_expired(cfqd, cic->cfqq[SYNC], 0);
cfq_put_queue(cic->cfqq[SYNC]);
cic->cfqq[SYNC] = NULL;
}
cfq_put_queue(cic->cfqq);
cic->cfqq = NULL;
cic->key = NULL;
spin_unlock(q->queue_lock);
}
@ -1259,7 +1268,8 @@ cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
if (cic) {
INIT_LIST_HEAD(&cic->list);
cic->cfqq = NULL;
cic->cfqq[ASYNC] = NULL;
cic->cfqq[SYNC] = NULL;
cic->key = NULL;
cic->last_end_request = jiffies;
cic->ttime_total = 0;
@ -1325,7 +1335,12 @@ static inline void changed_ioprio(struct cfq_io_context *cic)
struct cfq_queue *cfqq;
if (cfqd) {
spin_lock(cfqd->queue->queue_lock);
cfqq = cic->cfqq;
cfqq = cic->cfqq[ASYNC];
if (cfqq) {
cfq_mark_cfqq_prio_changed(cfqq);
cfq_init_prio_data(cfqq);
}
cfqq = cic->cfqq[SYNC];
if (cfqq) {
cfq_mark_cfqq_prio_changed(cfqq);
cfq_init_prio_data(cfqq);
@ -1892,6 +1907,7 @@ cfq_set_request(request_queue_t *q, struct request *rq, struct bio *bio,
struct cfq_queue *cfqq;
struct cfq_rq *crq;
unsigned long flags;
int is_sync = key != CFQ_KEY_ASYNC;
might_sleep_if(gfp_mask & __GFP_WAIT);
@ -1902,14 +1918,14 @@ cfq_set_request(request_queue_t *q, struct request *rq, struct bio *bio,
if (!cic)
goto queue_fail;
if (!cic->cfqq) {
if (!cic->cfqq[is_sync]) {
cfqq = cfq_get_queue(cfqd, key, tsk->ioprio, gfp_mask);
if (!cfqq)
goto queue_fail;
cic->cfqq = cfqq;
cic->cfqq[is_sync] = cfqq;
} else
cfqq = cic->cfqq;
cfqq = cic->cfqq[is_sync];
cfqq->allocated[rw]++;
cfq_clear_cfqq_must_alloc(cfqq);
@ -1926,7 +1942,7 @@ cfq_set_request(request_queue_t *q, struct request *rq, struct bio *bio,
crq->cfq_queue = cfqq;
crq->io_context = cic;
if (rw == READ || process_sync(tsk))
if (is_sync)
cfq_mark_crq_is_sync(crq);
else
cfq_clear_crq_is_sync(crq);

2
include/linux/blkdev.h
View File

@ -58,7 +58,7 @@ struct cfq_io_context {
* circular list of cfq_io_contexts belonging to a process io context
*/
struct list_head list;
struct cfq_queue *cfqq;
struct cfq_queue *cfqq[2];
void *key;
struct io_context *ioc;