From: Yu Kuai <yukuai1@huaweicloud.com> To: tj@kernel.org, mkoutny@suse.com, axboe@kernel.dk, ming.lei@redhat.com Cc: cgroups@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com Subject: [PATCH v7 9/9] blk-throttle: clean up flag 'THROTL_TG_PENDING' Date: Tue, 2 Aug 2022 22:04:15 +0800 [thread overview] Message-ID: <20220802140415.2960284-10-yukuai1@huaweicloud.com> (raw) In-Reply-To: <20220802140415.2960284-1-yukuai1@huaweicloud.com> From: Yu Kuai <yukuai3@huawei.com> All related operations are inside 'queue_lock', there is no need to use the flag, we only need to make sure throtl_enqueue_tg() is called when the first bio is throttled, and throtl_dequeue_tg() is called when the last throttled bio is dispatched. There are no functional changes in this patch. Signed-off-by: Yu Kuai <yukuai3@huawei.com> --- block/blk-throttle.c | 22 ++++++++-------------- block/blk-throttle.h | 7 +++---- 2 files changed, 11 insertions(+), 18 deletions(-) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 6b2096e95221..778c0131adb1 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -561,23 +561,16 @@ static void tg_service_queue_add(struct throtl_grp *tg) static void throtl_enqueue_tg(struct throtl_grp *tg) { - if (!(tg->flags & THROTL_TG_PENDING)) { - tg_service_queue_add(tg); - tg->flags |= THROTL_TG_PENDING; - tg->service_queue.parent_sq->nr_pending++; - } + tg_service_queue_add(tg); + tg->service_queue.parent_sq->nr_pending++; } static void throtl_dequeue_tg(struct throtl_grp *tg) { - if (tg->flags & THROTL_TG_PENDING) { - struct throtl_service_queue *parent_sq = - tg->service_queue.parent_sq; + struct throtl_service_queue *parent_sq = tg->service_queue.parent_sq; - throtl_rb_erase(&tg->rb_node, parent_sq); - --parent_sq->nr_pending; - tg->flags &= ~THROTL_TG_PENDING; - } + throtl_rb_erase(&tg->rb_node, parent_sq); + --parent_sq->nr_pending; } /* Call with queue lock held */ @@ -1026,8 +1019,9 @@ static void throtl_add_bio_tg(struct bio *bio, struct throtl_qnode *qn, throtl_qnode_add_bio(bio, qn, &sq->queued[rw]); + if (!sq->nr_queued[READ] && !sq->nr_queued[WRITE]) + throtl_enqueue_tg(tg); sq->nr_queued[rw]++; - throtl_enqueue_tg(tg); } static void tg_update_disptime(struct throtl_grp *tg) @@ -1382,7 +1376,7 @@ static void tg_conf_updated(struct throtl_grp *tg, bool global) throtl_start_new_slice(tg, READ, false); throtl_start_new_slice(tg, WRITE, false); - if (tg->flags & THROTL_TG_PENDING) { + if (sq->nr_queued[READ] || sq->nr_queued[WRITE]) { tg_update_disptime(tg); throtl_schedule_next_dispatch(sq->parent_sq, true); } diff --git a/block/blk-throttle.h b/block/blk-throttle.h index c9545616ba12..2ae5ac8fe76e 100644 --- a/block/blk-throttle.h +++ b/block/blk-throttle.h @@ -53,10 +53,9 @@ 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 */ - THROTL_TG_HAS_IOPS_LIMIT = 1 << 2, /* tg has iops limit */ - THROTL_TG_CANCELING = 1 << 3, /* starts to cancel bio */ + THROTL_TG_WAS_EMPTY = 1 << 0, /* bio_lists[] became non-empty */ + THROTL_TG_HAS_IOPS_LIMIT = 1 << 1, /* tg has iops limit */ + THROTL_TG_CANCELING = 1 << 2, /* starts to cancel bio */ }; enum { -- 2.31.1
WARNING: multiple messages have this Message-ID (diff)
From: Yu Kuai <yukuai1-XF6JlduFytWkHkcT6e4Xnw@public.gmane.org> To: tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mkoutny-IBi9RG/b67k@public.gmane.org, axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org, ming.lei-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org Cc: cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, yukuai3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org, yukuai1-XF6JlduFytWkHkcT6e4Xnw@public.gmane.org, yi.zhang-hv44wF8Li93QT0dZR+AlfA@public.gmane.org Subject: [PATCH v7 9/9] blk-throttle: clean up flag 'THROTL_TG_PENDING' Date: Tue, 2 Aug 2022 22:04:15 +0800 [thread overview] Message-ID: <20220802140415.2960284-10-yukuai1@huaweicloud.com> (raw) In-Reply-To: <20220802140415.2960284-1-yukuai1-XF6JlduFytWkHkcT6e4Xnw@public.gmane.org> From: Yu Kuai <yukuai3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> All related operations are inside 'queue_lock', there is no need to use the flag, we only need to make sure throtl_enqueue_tg() is called when the first bio is throttled, and throtl_dequeue_tg() is called when the last throttled bio is dispatched. There are no functional changes in this patch. Signed-off-by: Yu Kuai <yukuai3-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> --- block/blk-throttle.c | 22 ++++++++-------------- block/blk-throttle.h | 7 +++---- 2 files changed, 11 insertions(+), 18 deletions(-) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 6b2096e95221..778c0131adb1 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -561,23 +561,16 @@ static void tg_service_queue_add(struct throtl_grp *tg) static void throtl_enqueue_tg(struct throtl_grp *tg) { - if (!(tg->flags & THROTL_TG_PENDING)) { - tg_service_queue_add(tg); - tg->flags |= THROTL_TG_PENDING; - tg->service_queue.parent_sq->nr_pending++; - } + tg_service_queue_add(tg); + tg->service_queue.parent_sq->nr_pending++; } static void throtl_dequeue_tg(struct throtl_grp *tg) { - if (tg->flags & THROTL_TG_PENDING) { - struct throtl_service_queue *parent_sq = - tg->service_queue.parent_sq; + struct throtl_service_queue *parent_sq = tg->service_queue.parent_sq; - throtl_rb_erase(&tg->rb_node, parent_sq); - --parent_sq->nr_pending; - tg->flags &= ~THROTL_TG_PENDING; - } + throtl_rb_erase(&tg->rb_node, parent_sq); + --parent_sq->nr_pending; } /* Call with queue lock held */ @@ -1026,8 +1019,9 @@ static void throtl_add_bio_tg(struct bio *bio, struct throtl_qnode *qn, throtl_qnode_add_bio(bio, qn, &sq->queued[rw]); + if (!sq->nr_queued[READ] && !sq->nr_queued[WRITE]) + throtl_enqueue_tg(tg); sq->nr_queued[rw]++; - throtl_enqueue_tg(tg); } static void tg_update_disptime(struct throtl_grp *tg) @@ -1382,7 +1376,7 @@ static void tg_conf_updated(struct throtl_grp *tg, bool global) throtl_start_new_slice(tg, READ, false); throtl_start_new_slice(tg, WRITE, false); - if (tg->flags & THROTL_TG_PENDING) { + if (sq->nr_queued[READ] || sq->nr_queued[WRITE]) { tg_update_disptime(tg); throtl_schedule_next_dispatch(sq->parent_sq, true); } diff --git a/block/blk-throttle.h b/block/blk-throttle.h index c9545616ba12..2ae5ac8fe76e 100644 --- a/block/blk-throttle.h +++ b/block/blk-throttle.h @@ -53,10 +53,9 @@ 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 */ - THROTL_TG_HAS_IOPS_LIMIT = 1 << 2, /* tg has iops limit */ - THROTL_TG_CANCELING = 1 << 3, /* starts to cancel bio */ + THROTL_TG_WAS_EMPTY = 1 << 0, /* bio_lists[] became non-empty */ + THROTL_TG_HAS_IOPS_LIMIT = 1 << 1, /* tg has iops limit */ + THROTL_TG_CANCELING = 1 << 2, /* starts to cancel bio */ }; enum { -- 2.31.1
next prev parent reply other threads:[~2022-08-02 13:52 UTC|newest] Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-08-02 14:04 [PATCH v7 0/9] bugfix and cleanup for blk-throttle Yu Kuai 2022-08-02 14:04 ` Yu Kuai 2022-08-02 14:04 ` [PATCH v7 1/9] blk-throttle: fix that io throttle can only work for single bio Yu Kuai 2022-08-16 19:37 ` Tejun Heo 2022-08-17 1:13 ` Yu Kuai 2022-08-17 1:13 ` Yu Kuai 2022-08-17 17:50 ` Tejun Heo 2022-08-18 1:23 ` Yu Kuai 2022-08-18 1:23 ` Yu Kuai 2022-08-22 3:06 ` Yu Kuai 2022-08-22 3:06 ` Yu Kuai 2022-08-22 7:25 ` Tejun Heo 2022-08-22 7:25 ` Tejun Heo 2022-08-22 7:44 ` Yu Kuai 2022-08-22 7:44 ` Yu Kuai 2022-08-02 14:04 ` [PATCH v7 2/9] blk-throttle: prevent overflow while calculating wait time Yu Kuai 2022-08-02 14:04 ` [PATCH v7 3/9] blk-throttle: factor out code to calculate ios/bytes_allowed Yu Kuai 2022-08-02 14:04 ` Yu Kuai 2022-08-16 19:47 ` Tejun Heo 2022-08-17 1:32 ` Yu Kuai 2022-08-17 1:32 ` Yu Kuai 2022-08-02 14:04 ` [PATCH v7 4/9] blk-throttle: fix io hung due to configuration updates Yu Kuai 2022-08-02 14:04 ` Yu Kuai 2022-08-16 20:01 ` Tejun Heo 2022-08-16 20:01 ` Tejun Heo 2022-08-17 1:30 ` Yu Kuai 2022-08-17 1:30 ` Yu Kuai 2022-08-17 17:52 ` Tejun Heo 2022-08-17 17:52 ` Tejun Heo 2022-08-18 1:16 ` Yu Kuai 2022-08-18 1:16 ` Yu Kuai 2022-08-19 17:33 ` Tejun Heo 2022-08-19 17:33 ` Tejun Heo 2022-08-02 14:04 ` [PATCH v7 5/9] blk-throttle: improve handling of re-entered bio for bps limit Yu Kuai 2022-08-02 14:04 ` Yu Kuai 2022-08-16 20:02 ` Tejun Heo 2022-08-16 20:02 ` Tejun Heo 2022-08-02 14:04 ` [PATCH v7 6/9] blk-throttle: use 'READ/WRITE' instead of '0/1' Yu Kuai 2022-08-02 14:04 ` Yu Kuai 2022-08-16 20:03 ` Tejun Heo 2022-08-17 1:33 ` Yu Kuai 2022-08-17 1:33 ` Yu Kuai 2022-08-02 14:04 ` [PATCH v7 7/9] blk-throttle: calling throtl_dequeue/enqueue_tg in pairs Yu Kuai 2022-08-02 14:04 ` Yu Kuai 2022-08-02 14:04 ` [PATCH v7 8/9] blk-throttle: cleanup tg_update_disptime() Yu Kuai 2022-08-02 14:04 ` Yu Kuai 2022-08-16 20:09 ` Tejun Heo 2022-08-17 1:38 ` Yu Kuai 2022-08-17 1:38 ` Yu Kuai 2022-08-02 14:04 ` Yu Kuai [this message] 2022-08-02 14:04 ` [PATCH v7 9/9] blk-throttle: clean up flag 'THROTL_TG_PENDING' Yu Kuai 2022-08-16 20:14 ` Tejun Heo 2022-08-17 1:45 ` Yu Kuai 2022-08-17 1:45 ` Yu Kuai 2022-08-17 17:54 ` Tejun Heo 2022-08-17 17:54 ` Tejun Heo 2022-08-18 9:29 ` Yu Kuai 2022-08-18 9:29 ` Yu Kuai 2022-08-19 17:35 ` Tejun Heo 2022-08-19 17:35 ` Tejun Heo 2022-08-13 5:59 ` [PATCH v7 0/9] bugfix and cleanup for blk-throttle Yu Kuai 2022-08-13 5:59 ` Yu Kuai
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