Merge branch 'v2.6.37-rc2' into for-2.6.38/core

[pandora-kernel.git] / block / cfq-iosched.c

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 4cd59b0..73a5862 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -646,11 +646,11 @@ cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq)
 static inline bool cfq_slice_used(struct cfq_queue *cfqq)
 {
        if (cfq_cfqq_slice_new(cfqq))
-               return 0;
+               return false;
        if (time_before(jiffies, cfqq->slice_end))
-               return 0;
+               return false;
 
-       return 1;
+       return true;
 }
 
 /*
@@ -1901,10 +1901,10 @@ static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq)
         * in their service tree.
         */
        if (service_tree->count == 1 && cfq_cfqq_sync(cfqq))
-               return 1;
+               return true;
        cfq_log_cfqq(cfqd, cfqq, "Not idling. st->count:%d",
                        service_tree->count);
-       return 0;
+       return false;
 }
 
 static void cfq_arm_slice_timer(struct cfq_data *cfqd)
@@ -2293,6 +2293,17 @@ static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd)
                goto keep_queue;
        }
 
+       /*
+        * This is a deep seek queue, but the device is much faster than
+        * the queue can deliver, don't idle
+        **/
+       if (CFQQ_SEEKY(cfqq) && cfq_cfqq_idle_window(cfqq) &&
+           (cfq_cfqq_slice_new(cfqq) ||
+           (cfqq->slice_end - jiffies > jiffies - cfqq->slice_start))) {
+               cfq_clear_cfqq_deep(cfqq);
+               cfq_clear_cfqq_idle_window(cfqq);
+       }
+
        if (cfqq->dispatched && cfq_should_idle(cfqd, cfqq)) {
                cfqq = NULL;
                goto keep_queue;
@@ -2367,12 +2378,12 @@ static inline bool cfq_slice_used_soon(struct cfq_data *cfqd,
 {
        /* the queue hasn't finished any request, can't estimate */
        if (cfq_cfqq_slice_new(cfqq))
-               return 1;
+               return true;
        if (time_after(jiffies + cfqd->cfq_slice_idle * cfqq->dispatched,
                cfqq->slice_end))
-               return 1;
+               return true;
 
-       return 0;
+       return false;
 }
 
 static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq)
@@ -3265,6 +3276,10 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
        if (cfq_class_rt(new_cfqq) && !cfq_class_rt(cfqq))
                return true;
 
+       /* An idle queue should not be idle now for some reason */
+       if (RB_EMPTY_ROOT(&cfqq->sort_list) && !cfq_should_idle(cfqd, cfqq))
+               return true;
+
        if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq))
                return false;