cfq-iosched: slice offset should take ioprio into account

Use the max_slice-cur_slice as the multipler for the insertion offset.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 29284fa06e6b..4a0397022f5b 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -442,7 +442,8 @@ static unsigned long cfq_slice_offset(struct cfq_data *cfqd,
         /*
          * just an approximation, should be ok.
          */
-        return ((cfqd->busy_queues - 1) * cfq_prio_slice(cfqd, 1, 0));
+        return (cfqd->busy_queues - 1) * (cfq_prio_slice(cfqd, 1, 0) -
+                       cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio));
 }
 
 /*