A bfq_queue may happen to be deemed as soft real-time while it is
still enjoying interactive weight-raising. If this happens because of
a false positive, then the bfq_queue is likely to loose its soft
real-time status soon. Upon losing such a status, the bfq_queue must
get back its interactive weight-raising, if its interactive period is
not over yet. But this case is not handled. This commit corrects this
error.
Tested-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Paolo Valente <paolo.valente@xxxxxxxxxx>
---
block/bfq-iosched.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 6a02a12ff553..9e5242b2788a 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -5293,8 +5293,26 @@ bfq_update_io_seektime(struct bfq_data *bfqd, struct bfq_queue *bfqq,
if (bfqq->wr_coeff > 1 &&
bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time &&
- BFQQ_TOTALLY_SEEKY(bfqq))
- bfq_bfqq_end_wr(bfqq);
+ BFQQ_TOTALLY_SEEKY(bfqq)) {
+ if (time_is_before_jiffies(bfqq->wr_start_at_switch_to_srt +
+ bfq_wr_duration(bfqd))) {
+ /*
+ * In soft_rt weight raising with the
+ * interactive-weight-raising period
+ * elapsed (so no switch back to
+ * interactive weight raising).
+ */
+ bfq_bfqq_end_wr(bfqq);
+ } else { /*
+ * stopping soft_rt weight raising
+ * while still in interactive period,
+ * switch back to interactive weight
+ * raising
+ */
+ switch_back_to_interactive_wr(bfqq, bfqd);
+ bfqq->entity.prio_changed = 1;
+ }
+ }
}
static void bfq_update_has_short_ttime(struct bfq_data *bfqd,
--
2.20.1
