2 files changed, 33 insertions, 21 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d8b108737b72..56255599a022 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -2008,10 +2008,10 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
          * slice, then don't idle. This avoids overrunning the allotted
          * time slice.
          */
-        if (sample_valid(cic->ttime_samples) &&
-            (cfqq->slice_end - jiffies < cic->ttime_mean)) {
+        if (sample_valid(cic->ttime.ttime_samples) &&
+            (cfqq->slice_end - jiffies < cic->ttime.ttime_mean)) {
                 cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%lu",
-                             cic->ttime_mean);
+                             cic->ttime.ttime_mean);
                 return;
         }
 
@@ -2819,7 +2819,7 @@ cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
         cic = kmem_cache_alloc_node(cfq_ioc_pool, gfp_mask | __GFP_ZERO,
                                                         cfqd->queue->node);
         if (cic) {
-                cic->last_end_request = jiffies;
+                cic->ttime.last_end_request = jiffies;
                 INIT_LIST_HEAD(&cic->queue_list);
                 INIT_HLIST_NODE(&cic->cic_list);
                 cic->dtor = cfq_free_io_context;
@@ -3206,14 +3206,22 @@ err:
 }
 
 static void
-cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_io_context *cic)
+__cfq_update_io_thinktime(struct cfq_ttime *ttime, unsigned long slice_idle)
 {
-        unsigned long elapsed = jiffies - cic->last_end_request;
-        unsigned long ttime = min(elapsed, 2UL * cfqd->cfq_slice_idle);
+        unsigned long elapsed = jiffies - ttime->last_end_request;
+        elapsed = min(elapsed, 2UL * slice_idle);
 
-        cic->ttime_samples = (7*cic->ttime_samples + 256) / 8;
-        cic->ttime_total = (7*cic->ttime_total + 256*ttime) / 8;
-        cic->ttime_mean = (cic->ttime_total + 128) / cic->ttime_samples;
+        ttime->ttime_samples = (7*ttime->ttime_samples + 256) / 8;
+        ttime->ttime_total = (7*ttime->ttime_total + 256*elapsed) / 8;
+        ttime->ttime_mean = (ttime->ttime_total + 128) / ttime->ttime_samples;
+}
+
+static void
+cfq_update_io_thinktime(struct cfq_data *cfqd, struct cfq_queue *cfqq,
+        struct cfq_io_context *cic)
+{
+        if (cfq_cfqq_sync(cfqq))
+                __cfq_update_io_thinktime(&cic->ttime, cfqd->cfq_slice_idle);
 }
 
 static void
@@ -3262,8 +3270,8 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
         else if (!atomic_read(&cic->ioc->nr_tasks) || !cfqd->cfq_slice_idle ||
             (!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq)))
                 enable_idle = 0;
-        else if (sample_valid(cic->ttime_samples)) {
-                if (cic->ttime_mean > cfqd->cfq_slice_idle)
+        else if (sample_valid(cic->ttime.ttime_samples)) {
+                if (cic->ttime.ttime_mean > cfqd->cfq_slice_idle)
                         enable_idle = 0;
                 else
                         enable_idle = 1;
@@ -3389,7 +3397,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
 
         cfqd->rq_queued++;
 
-        cfq_update_io_thinktime(cfqd, cic);
+        cfq_update_io_thinktime(cfqd, cfqq, cic);
         cfq_update_io_seektime(cfqd, cfqq, rq);
         cfq_update_idle_window(cfqd, cfqq, cic);
 
@@ -3500,8 +3508,8 @@ static bool cfq_should_wait_busy(struct cfq_data *cfqd, struct cfq_queue *cfqq)
                 return true;
 
         /* if slice left is less than think time, wait busy */
-        if (cic && sample_valid(cic->ttime_samples)
-            && (cfqq->slice_end - jiffies < cic->ttime_mean))
+        if (cic && sample_valid(cic->ttime.ttime_samples)
+            && (cfqq->slice_end - jiffies < cic->ttime.ttime_mean))
                 return true;
 
         /*
@@ -3542,7 +3550,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
         cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;
 
         if (sync) {
-                RQ_CIC(rq)->last_end_request = now;
+                RQ_CIC(rq)->ttime.last_end_request = now;
                 if (!time_after(rq->start_time + cfqd->cfq_fifo_expire[1], now))
                         cfqd->last_delayed_sync = now;
         }
diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index b2eee896dcbc..5037a0ad2312 100644
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -5,6 +5,14 @@
 #include <linux/rcupdate.h>
 
 struct cfq_queue;
+struct cfq_ttime {
+        unsigned long last_end_request;
+
+        unsigned long ttime_total;
+        unsigned long ttime_samples;
+        unsigned long ttime_mean;
+};
+
 struct cfq_io_context {
         void *key;
 
@@ -12,11 +20,7 @@ struct cfq_io_context {
 
         struct io_context *ioc;
 
-        unsigned long last_end_request;
-
-        unsigned long ttime_total;
-        unsigned long ttime_samples;
-        unsigned long ttime_mean;
+        struct cfq_ttime ttime;
 
         struct list_head queue_list;
         struct hlist_node cic_list;