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authorPaolo Valente <paolo.valente@linaro.org>2021-01-25 20:02:45 +0100
committerJens Axboe <axboe@kernel.dk>2021-01-25 14:18:32 -0700
commitd1f600fa4732dac36c71a03b790f0c829a076475 (patch)
tree38c8aee3d42fb1194c8b6daae7c73837d6dfb51b /block
parent7f1995c27b19060dbdff23442f375e3097c90707 (diff)
block, bfq: fix switch back from soft-rt weitgh-raising
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@suse.cz> Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/bfq-iosched.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 44c6433b5b25..170aa0ccc121 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -5290,8 +5290,26 @@ 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,