Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[cascardo/linux.git] / block / blk-throttle.c

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index f1aba26..a3ea826 100644 (file)
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -780,9 +780,11 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio,
        /*
         * If previous slice expired, start a new one otherwise renew/extend
         * existing slice to make sure it is at least throtl_slice interval
-        * long since now.
+        * long since now. New slice is started only for empty throttle group.
+        * If there is queued bio, that means there should be an active
+        * slice and it should be extended instead.
         */
-       if (throtl_slice_used(tg, rw))
+       if (throtl_slice_used(tg, rw) && !(tg->service_queue.nr_queued[rw]))
                throtl_start_new_slice(tg, rw);
        else {
                if (time_before(tg->slice_end[rw], jiffies + throtl_slice))