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| author | Paolo Valente <paolo.valente@linaro.org> | 2017-12-20 12:38:31 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-01-05 09:26:06 -0700 |
| commit | 05e90283561648301e30232fe0c91bd345ceba03 (patch) | |
| tree | eaa740f53e70ef02fa1ec9c8d7db8fe5e00d40bb /block | |
| parent | f0ba5ea2fe45c0ad24a7dedae84a97f7aa046494 (diff) | |
| download | linux-stable-05e90283561648301e30232fe0c91bd345ceba03.tar.gz linux-stable-05e90283561648301e30232fe0c91bd345ceba03.tar.bz2 linux-stable-05e90283561648301e30232fe0c91bd345ceba03.zip | |
block, bfq: add missing rq_pos_tree update on rq removal
If two processes do I/O close to each other, then BFQ merges the
bfq_queues associated with these processes, to get a more sequential
I/O, and thus a higher throughput. In this respect, to detect whether
two processes are doing I/O close to each other, BFQ keeps a list of
the head-of-line I/O requests of all active bfq_queues. The list is
ordered by initial sectors, and implemented through a red-black tree
(rq_pos_tree).
Unfortunately, the update of the rq_pos_tree was incomplete, because
the tree was not updated on the removal of the head-of-line I/O
request of a bfq_queue, in case the queue did not remain empty. This
commit adds the missing update.
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Angelo Ruocco <angeloruocco90@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bfq-iosched.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 0f48583b9380..fa395a260a23 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -1627,6 +1627,8 @@ static void bfq_remove_request(struct request_queue *q, rb_erase(&bfqq->pos_node, bfqq->pos_root); bfqq->pos_root = NULL; } + } else { + bfq_pos_tree_add_move(bfqd, bfqq); } if (rq->cmd_flags & REQ_META) |