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authorPaolo Valente <paolo.valente@linaro.org>2019-06-25 07:12:46 +0200
committerJens Axboe <axboe@kernel.dk>2019-06-25 09:07:34 -0600
commita3f9bce3697a5b4039ff7096db4a1ee897349276 (patch)
tree24d9d3a9e58279913cd889b11590c29570728af8 /block
parent24792ad01cb659c8b5899de2af6e8ca250f93df3 (diff)
block, bfq: bring forward seek&think time update
Until the base value for request service times gets finally computed for a bfq_queue, the inject limit for that queue does depend on the think-time state (short|long) of the queue. A timely update of the think time then guarantees a quicker activation or deactivation of the injection. Fortunately, the think time of a bfq_queue is updated in the same code path as the inject limit; but after the inject limit. This commits moves the update of the think time before the update of the inject limit. For coherence, it moves the update of the seek time too. Reported-by: Srivatsa S. Bhat (VMware) <srivatsa@csail.mit.edu> Tested-by: Srivatsa S. Bhat (VMware) <srivatsa@csail.mit.edu> 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.c14
1 files changed, 4 insertions, 10 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 62442083b147..d5bc32371ace 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -4979,19 +4979,9 @@ static void bfq_update_has_short_ttime(struct bfq_data *bfqd,
static void bfq_rq_enqueued(struct bfq_data *bfqd, struct bfq_queue *bfqq,
struct request *rq)
{
- struct bfq_io_cq *bic = RQ_BIC(rq);
-
if (rq->cmd_flags & REQ_META)
bfqq->meta_pending++;
- bfq_update_io_thinktime(bfqd, bfqq);
- bfq_update_has_short_ttime(bfqd, bfqq, bic);
- bfq_update_io_seektime(bfqd, bfqq, rq);
-
- bfq_log_bfqq(bfqd, bfqq,
- "rq_enqueued: has_short_ttime=%d (seeky %d)",
- bfq_bfqq_has_short_ttime(bfqq), BFQQ_SEEKY(bfqq));
-
bfqq->last_request_pos = blk_rq_pos(rq) + blk_rq_sectors(rq);
if (bfqq == bfqd->in_service_queue && bfq_bfqq_wait_request(bfqq)) {
@@ -5079,6 +5069,10 @@ static bool __bfq_insert_request(struct bfq_data *bfqd, struct request *rq)
bfqq = new_bfqq;
}
+ bfq_update_io_thinktime(bfqd, bfqq);
+ bfq_update_has_short_ttime(bfqd, bfqq, RQ_BIC(rq));
+ bfq_update_io_seektime(bfqd, bfqq, rq);
+
waiting = bfqq && bfq_bfqq_wait_request(bfqq);
bfq_add_request(rq);
idle_timer_disabled = waiting && !bfq_bfqq_wait_request(bfqq);