cfq-iosched: no need to keep track of busy_rt_queues

[~andy/linux] / block / cfq-iosched.c

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 87276eb83f7f54576fe8fc65c84605133b3e7000..ca0d7e71324b814fdf0e22e60ac3e2648dca7f94 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -134,13 +134,8 @@ struct cfq_data {
        struct rb_root prio_trees[CFQ_PRIO_LISTS];
 
        unsigned int busy_queues;
-       /*
-        * Used to track any pending rt requests so we can pre-empt current
-        * non-RT cfqq in service when this value is non-zero.
-        */
-       unsigned int busy_rt_queues;
 
-       int rq_in_driver;
+       int rq_in_driver[2];
        int sync_flight;
 
        /*
@@ -239,6 +234,11 @@ static struct cfq_queue *cfq_get_queue(struct cfq_data *, int,
 static struct cfq_io_context *cfq_cic_lookup(struct cfq_data *,
                                                struct io_context *);
 
+static inline int rq_in_driver(struct cfq_data *cfqd)
+{
+       return cfqd->rq_in_driver[0] + cfqd->rq_in_driver[1];
+}
+
 static inline struct cfq_queue *cic_to_cfqq(struct cfq_io_context *cic,
                                            int is_sync)
 {
@@ -648,8 +648,6 @@ static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq)
        BUG_ON(cfq_cfqq_on_rr(cfqq));
        cfq_mark_cfqq_on_rr(cfqq);
        cfqd->busy_queues++;
-       if (cfq_class_rt(cfqq))
-               cfqd->busy_rt_queues++;
 
        cfq_resort_rr_list(cfqd, cfqq);
 }
@@ -673,8 +671,6 @@ static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq)
 
        BUG_ON(!cfqd->busy_queues);
        cfqd->busy_queues--;
-       if (cfq_class_rt(cfqq))
-               cfqd->busy_rt_queues--;
 }
 
 /*
@@ -760,9 +756,9 @@ static void cfq_activate_request(struct request_queue *q, struct request *rq)
 {
        struct cfq_data *cfqd = q->elevator->elevator_data;
 
-       cfqd->rq_in_driver++;
+       cfqd->rq_in_driver[rq_is_sync(rq)]++;
        cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d",
-                                               cfqd->rq_in_driver);
+                                               rq_in_driver(cfqd));
 
        cfqd->last_position = blk_rq_pos(rq) + blk_rq_sectors(rq);
 }
@@ -770,11 +766,12 @@ static void cfq_activate_request(struct request_queue *q, struct request *rq)
 static void cfq_deactivate_request(struct request_queue *q, struct request *rq)
 {
        struct cfq_data *cfqd = q->elevator->elevator_data;
+       const int sync = rq_is_sync(rq);
 
-       WARN_ON(!cfqd->rq_in_driver);
-       cfqd->rq_in_driver--;
+       WARN_ON(!cfqd->rq_in_driver[sync]);
+       cfqd->rq_in_driver[sync]--;
        cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "deactivate rq, drv=%d",
-                                               cfqd->rq_in_driver);
+                                               rq_in_driver(cfqd));
 }
 
 static void cfq_remove_request(struct request *rq)
@@ -1080,7 +1077,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
        /*
         * still requests with the driver, don't idle
         */
-       if (cfqd->rq_in_driver)
+       if (rq_in_driver(cfqd))
                return;
 
        /*
@@ -1178,20 +1175,6 @@ static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd)
        if (cfq_slice_used(cfqq) && !cfq_cfqq_must_dispatch(cfqq))
                goto expire;
 
-       /*
-        * If we have a RT cfqq waiting, then we pre-empt the current non-rt
-        * cfqq.
-        */
-       if (!cfq_class_rt(cfqq) && cfqd->busy_rt_queues) {
-               /*
-                * We simulate this as cfqq timed out so that it gets to bank
-                * the remaining of its time slice.
-                */
-               cfq_log_cfqq(cfqd, cfqq, "preempt");
-               cfq_slice_expired(cfqd, 1);
-               goto new_queue;
-       }
-
        /*
         * The active queue has requests and isn't expired, allow it to
         * dispatch.
@@ -1311,6 +1294,12 @@ static int cfq_dispatch_requests(struct request_queue *q, int force)
        if (!cfqq)
                return 0;
 
+       /*
+        * Drain async requests before we start sync IO
+        */
+       if (cfq_cfqq_idle_window(cfqq) && cfqd->rq_in_driver[BLK_RW_ASYNC])
+               return 0;
+
        /*
         * If this is an async queue and we have sync IO in flight, let it wait
         */
@@ -2130,11 +2119,11 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq)
  */
 static void cfq_update_hw_tag(struct cfq_data *cfqd)
 {
-       if (cfqd->rq_in_driver > cfqd->rq_in_driver_peak)
-               cfqd->rq_in_driver_peak = cfqd->rq_in_driver;
+       if (rq_in_driver(cfqd) > cfqd->rq_in_driver_peak)
+               cfqd->rq_in_driver_peak = rq_in_driver(cfqd);
 
        if (cfqd->rq_queued <= CFQ_HW_QUEUE_MIN &&
-           cfqd->rq_in_driver <= CFQ_HW_QUEUE_MIN)
+           rq_in_driver(cfqd) <= CFQ_HW_QUEUE_MIN)
                return;
 
        if (cfqd->hw_tag_samples++ < 50)
@@ -2161,9 +2150,9 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
 
        cfq_update_hw_tag(cfqd);
 
-       WARN_ON(!cfqd->rq_in_driver);
+       WARN_ON(!cfqd->rq_in_driver[sync]);
        WARN_ON(!cfqq->dispatched);
-       cfqd->rq_in_driver--;
+       cfqd->rq_in_driver[sync]--;
        cfqq->dispatched--;
 
        if (cfq_cfqq_sync(cfqq))
@@ -2197,7 +2186,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
                        cfq_arm_slice_timer(cfqd);
        }
 
-       if (!cfqd->rq_in_driver)
+       if (!rq_in_driver(cfqd))
                cfq_schedule_dispatch(cfqd);
 }
 
@@ -2311,7 +2300,7 @@ cfq_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask)
                goto queue_fail;
 
        cfqq = cic_to_cfqq(cic, is_sync);
-       if (!cfqq) {
+       if (!cfqq || cfqq == &cfqd->oom_cfqq) {
                cfqq = cfq_get_queue(cfqd, is_sync, cic->ioc, gfp_mask);
                cic_set_cfqq(cic, cfqq, is_sync);
        }