1 files changed, 32 insertions, 10 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index dee9d9378fee..838834be115b 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -7,6 +7,7 @@
  *  Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
  */
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/blkdev.h>
 #include <linux/elevator.h>
 #include <linux/jiffies.h>
@@ -47,6 +48,7 @@ static const int cfq_hist_divisor = 4;
 #define CFQ_SERVICE_SHIFT       12
 
 #define CFQQ_SEEK_THR           (sector_t)(8 * 100)
+#define CFQQ_CLOSE_THR          (sector_t)(8 * 1024)
 #define CFQQ_SECT_THR_NONROT    (sector_t)(2 * 32)
 #define CFQQ_SEEKY(cfqq)        (hweight32(cfqq->seek_history) > 32/8)
 
@@ -947,6 +949,11 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
         unsigned int major, minor;
 
         cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key));
+        if (cfqg && !cfqg->blkg.dev && bdi->dev && dev_name(bdi->dev)) {
+                sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
+                cfqg->blkg.dev = MKDEV(major, minor);
+                goto done;
+        }
         if (cfqg || !create)
                 goto done;
 
@@ -1517,7 +1524,8 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd,
                                    struct cfq_queue *cfqq)
 {
         if (cfqq) {
-                cfq_log_cfqq(cfqd, cfqq, "set_active");
+                cfq_log_cfqq(cfqd, cfqq, "set_active wl_prio:%d wl_type:%d",
+                                cfqd->serving_prio, cfqd->serving_type);
                 cfqq->slice_start = 0;
                 cfqq->dispatch_start = jiffies;
                 cfqq->allocated_slice = 0;
@@ -1660,9 +1668,9 @@ static inline sector_t cfq_dist_from_last(struct cfq_data *cfqd,
 }
 
 static inline int cfq_rq_close(struct cfq_data *cfqd, struct cfq_queue *cfqq,
-                               struct request *rq, bool for_preempt)
+                               struct request *rq)
 {
-        return cfq_dist_from_last(cfqd, rq) <= CFQQ_SEEK_THR;
+        return cfq_dist_from_last(cfqd, rq) <= CFQQ_CLOSE_THR;
 }
 
 static struct cfq_queue *cfqq_close(struct cfq_data *cfqd,
@@ -1689,7 +1697,7 @@ static struct cfq_queue *cfqq_close(struct cfq_data *cfqd,
          * will contain the closest sector.
          */
         __cfqq = rb_entry(parent, struct cfq_queue, p_node);
-        if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq, false))
+        if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq))
                 return __cfqq;
 
         if (blk_rq_pos(__cfqq->next_rq) < sector)
@@ -1700,7 +1708,7 @@ static struct cfq_queue *cfqq_close(struct cfq_data *cfqd,
                 return NULL;
 
         __cfqq = rb_entry(node, struct cfq_queue, p_node);
-        if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq, false))
+        if (cfq_rq_close(cfqd, cur_cfqq, __cfqq->next_rq))
                 return __cfqq;
 
         return NULL;
@@ -1721,6 +1729,8 @@ static struct cfq_queue *cfq_close_cooperator(struct cfq_data *cfqd,
 {
         struct cfq_queue *cfqq;
 
+        if (cfq_class_idle(cur_cfqq))
+                return NULL;
         if (!cfq_cfqq_sync(cur_cfqq))
                 return NULL;
         if (CFQQ_SEEKY(cur_cfqq))
@@ -1787,7 +1797,11 @@ static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq)
          * Otherwise, we do only if they are the last ones
          * in their service tree.
          */
-        return service_tree->count == 1 && cfq_cfqq_sync(cfqq);
+        if (service_tree->count == 1 && cfq_cfqq_sync(cfqq))
+                return 1;
+        cfq_log_cfqq(cfqd, cfqq, "Not idling. st->count:%d",
+                        service_tree->count);
+        return 0;
 }
 
 static void cfq_arm_slice_timer(struct cfq_data *cfqd)
@@ -1832,8 +1846,11 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
          * time slice.
          */
         if (sample_valid(cic->ttime_samples) &&
-            (cfqq->slice_end - jiffies < cic->ttime_mean))
+            (cfqq->slice_end - jiffies < cic->ttime_mean)) {
+                cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%d",
+                                cic->ttime_mean);
                 return;
+        }
 
         cfq_mark_cfqq_wait_request(cfqq);
 
@@ -2041,6 +2058,7 @@ static void choose_service_tree(struct cfq_data *cfqd, struct cfq_group *cfqg)
                 slice = max(slice, 2 * cfqd->cfq_slice_idle);
 
         slice = max_t(unsigned, slice, CFQ_MIN_TT);
+        cfq_log(cfqd, "workload slice:%d", slice);
         cfqd->workload_expires = jiffies + slice;
         cfqd->noidle_tree_requires_idle = false;
 }
@@ -2188,10 +2206,13 @@ static int cfq_forced_dispatch(struct cfq_data *cfqd)
         struct cfq_queue *cfqq;
         int dispatched = 0;
 
-        while ((cfqq = cfq_get_next_queue_forced(cfqd)) != NULL)
+        /* Expire the timeslice of the current active queue first */
+        cfq_slice_expired(cfqd, 0);
+        while ((cfqq = cfq_get_next_queue_forced(cfqd)) != NULL) {
+                __cfq_set_active_queue(cfqd, cfqq);
                 dispatched += __cfq_forced_dispatch_cfqq(cfqq);
+        }
 
-        cfq_slice_expired(cfqd, 0);
         BUG_ON(cfqd->busy_queues);
 
         cfq_log(cfqd, "forced_dispatch=%d", dispatched);
@@ -3103,7 +3124,7 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
          * if this request is as-good as one we would expect from the
          * current cfqq, let it preempt
          */
-        if (cfq_rq_close(cfqd, cfqq, rq, true))
+        if (cfq_rq_close(cfqd, cfqq, rq))
                 return true;
 
         return false;
@@ -3307,6 +3328,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
                 if (cfq_should_wait_busy(cfqd, cfqq)) {
                         cfqq->slice_end = jiffies + cfqd->cfq_slice_idle;
                         cfq_mark_cfqq_wait_busy(cfqq);
+                        cfq_log_cfqq(cfqd, cfqq, "will busy wait");
                 }
 
                 /*