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author | Tejun Heo <tj@kernel.org> | 2013-05-15 00:52:35 +0400 |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2013-05-15 00:52:35 +0400 |
commit | 0e9f4164ba915052918a77ecb2a59822dbfd661c (patch) | |
tree | 3b9756ee1b216b9f8a9ed5e53623e4036971912b /block | |
parent | 651930bc1c2a2550fde93a8cfa1a201c363a0ca1 (diff) | |
download | linux-0e9f4164ba915052918a77ecb2a59822dbfd661c.tar.xz |
blk-throttle: generalize update_disptime optimization in blk_throtl_bio()
When blk_throtl_bio() wants to queue a bio to a tg (throtl_grp), it
avoids invoking tg_update_disptime() and
throtl_schedule_next_dispatch() if the tg already has bios queued in
that direction. As a new bio is appeneded after the existing ones, it
can't change the tg's next dispatch time or the parent's dispatch
schedule.
This optimization is currently open coded in blk_throtl_bio().
Whether the target biolist was occupied was recorded in a local
variable and later used to skip disptime update. This patch moves
generalizes it so that throtl_add_bio_tg() sets a new flag
THROTL_TG_WAS_EMPTY if the biolist was empty before the new bio was
added. tg_update_disptime() clears the flag automatically.
blk_throtl_bio() is updated to simply test the flag before updating
disptime.
This patch doesn't make any functional differences now but will enable
using the same optimization for recursive dispatch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Diffstat (limited to 'block')
-rw-r--r-- | block/blk-throttle.c | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 154bd63719c5..ec9397f3eb0a 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -46,6 +46,7 @@ struct throtl_service_queue { enum tg_state_flags { THROTL_TG_PENDING = 1 << 0, /* on parent's pending tree */ + THROTL_TG_WAS_EMPTY = 1 << 1, /* bio_lists[] became non-empty */ }; #define rb_entry_tg(node) rb_entry((node), struct throtl_grp, rb_node) @@ -712,6 +713,15 @@ static void throtl_add_bio_tg(struct bio *bio, struct throtl_grp *tg, struct throtl_service_queue *sq = &tg->service_queue; bool rw = bio_data_dir(bio); + /* + * If @tg doesn't currently have any bios queued in the same + * direction, queueing @bio can change when @tg should be + * dispatched. Mark that @tg was empty. This is automatically + * cleaered on the next tg_update_disptime(). + */ + if (!sq->nr_queued[rw]) + tg->flags |= THROTL_TG_WAS_EMPTY; + bio_list_add(&sq->bio_lists[rw], bio); /* Take a bio reference on tg */ blkg_get(tg_to_blkg(tg)); @@ -740,6 +750,9 @@ static void tg_update_disptime(struct throtl_grp *tg, throtl_dequeue_tg(tg, parent_sq); tg->disptime = disptime; throtl_enqueue_tg(tg, parent_sq); + + /* see throtl_add_bio_tg() */ + tg->flags &= ~THROTL_TG_WAS_EMPTY; } static void tg_dispatch_one_bio(struct throtl_grp *tg, bool rw, @@ -1061,7 +1074,7 @@ bool blk_throtl_bio(struct request_queue *q, struct bio *bio) struct throtl_data *td = q->td; struct throtl_grp *tg; struct throtl_service_queue *sq; - bool rw = bio_data_dir(bio), update_disptime = true; + bool rw = bio_data_dir(bio); struct blkcg *blkcg; bool throttled = false; @@ -1097,16 +1110,10 @@ bool blk_throtl_bio(struct request_queue *q, struct bio *bio) sq = &tg->service_queue; - if (sq->nr_queued[rw]) { - /* - * There is already another bio queued in same dir. No - * need to update dispatch time. - */ - update_disptime = false; + /* throtl is FIFO - if other bios are already queued, should queue */ + if (sq->nr_queued[rw]) goto queue_bio; - } - /* Bio is with-in rate limit of group */ if (tg_may_dispatch(tg, bio, NULL)) { throtl_charge_bio(tg, bio); @@ -1138,7 +1145,8 @@ queue_bio: throtl_add_bio_tg(bio, tg, &q->td->service_queue); throttled = true; - if (update_disptime) { + /* update @tg's dispatch time if @tg was empty before @bio */ + if (tg->flags & THROTL_TG_WAS_EMPTY) { tg_update_disptime(tg, &td->service_queue); throtl_schedule_next_dispatch(td); } |