From: Ming Lei <ming.lei@redhat.com> To: Jens Axboe <axboe@kernel.dk> Cc: linux-block@vger.kernel.org, Jeffle Xu <jefflexu@linux.alibaba.com>, Mike Snitzer <snitzer@redhat.com>, dm-devel@redhat.com, Hannes Reinecke <hare@suse.de>, Ming Lei <ming.lei@redhat.com> Subject: [PATCH V6 10/12] block: limit hw queues to be polled in each blk_poll() Date: Thu, 22 Apr 2021 20:20:36 +0800 [thread overview] Message-ID: <20210422122038.2192933-11-ming.lei@redhat.com> (raw) In-Reply-To: <20210422122038.2192933-1-ming.lei@redhat.com> Limit at most 8 queues are polled in each blk_pull(), avoid to add extra latency when queue depth is high. Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> --- block/blk-poll.c | 78 ++++++++++++++++++++++++++++++++++-------------- 1 file changed, 55 insertions(+), 23 deletions(-) diff --git a/block/blk-poll.c b/block/blk-poll.c index 249d73ff6f81..20e7c47cc984 100644 --- a/block/blk-poll.c +++ b/block/blk-poll.c @@ -288,36 +288,32 @@ static void bio_grp_list_move(struct bio_grp_list *dst, src->nr_grps -= cnt; } -static int blk_mq_poll_io(struct bio *bio) +#define POLL_HCTX_MAX_CNT 8 + +static bool blk_add_unique_hctx(struct blk_mq_hw_ctx **data, int *cnt, + struct blk_mq_hw_ctx *hctx) { - struct request_queue *q = bio->bi_bdev->bd_disk->queue; - blk_qc_t cookie = bio_get_poll_data(bio); - int ret = 0; + int i; - /* wait until the bio is submitted really */ - if (!blk_qc_t_ready(cookie)) - return 0; - if (!bio_flagged(bio, BIO_DONE) && blk_qc_t_valid(cookie)) { - struct blk_mq_hw_ctx *hctx = - q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)]; + for (i = 0; i < *cnt; i++) { + if (data[i] == hctx) + goto exit; + } - ret += blk_mq_poll_hctx(q, hctx); + if (i < POLL_HCTX_MAX_CNT) { + data[i] = hctx; + (*cnt)++; } - return ret; + exit: + return *cnt == POLL_HCTX_MAX_CNT; } -static int blk_bio_poll_and_end_io(struct bio_grp_list *grps) +static void blk_build_poll_queues(struct bio_grp_list *grps, + struct blk_mq_hw_ctx **data, int *cnt) { - int ret = 0; int i; - /* - * Poll hw queue first. - * - * TODO: limit max poll times and make sure to not poll same - * hw queue one more time. - */ for (i = 0; i < grps->nr_grps; i++) { struct bio_grp_list_data *grp = &grps->head[i]; struct bio *bio; @@ -325,11 +321,31 @@ static int blk_bio_poll_and_end_io(struct bio_grp_list *grps) if (bio_grp_list_grp_empty(grp)) continue; - for (bio = grp->list.head; bio; bio = bio->bi_poll) - ret += blk_mq_poll_io(bio); + for (bio = grp->list.head; bio; bio = bio->bi_poll) { + blk_qc_t cookie; + struct blk_mq_hw_ctx *hctx; + struct request_queue *q; + + if (bio_flagged(bio, BIO_DONE)) + continue; + + /* wait until the bio is submitted really */ + cookie = bio_get_poll_data(bio); + if (!blk_qc_t_ready(cookie) || !blk_qc_t_valid(cookie)) + continue; + + q = bio->bi_bdev->bd_disk->queue; + hctx = q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)]; + if (blk_add_unique_hctx(data, cnt, hctx)) + return; + } } +} + +static void blk_bio_poll_reap_ios(struct bio_grp_list *grps) +{ + int i; - /* reap bios */ for (i = 0; i < grps->nr_grps; i++) { struct bio_grp_list_data *grp = &grps->head[i]; struct bio *bio; @@ -354,6 +370,22 @@ static int blk_bio_poll_and_end_io(struct bio_grp_list *grps) } __bio_grp_list_merge(&grp->list, &bl); } +} + +static int blk_bio_poll_and_end_io(struct bio_grp_list *grps) +{ + int ret = 0; + int i; + struct blk_mq_hw_ctx *hctx[POLL_HCTX_MAX_CNT]; + int cnt = 0; + + blk_build_poll_queues(grps, hctx, &cnt); + + for (i = 0; i < cnt; i++) + ret += blk_mq_poll_hctx(hctx[i]->queue, hctx[i]); + + blk_bio_poll_reap_ios(grps); + return ret; } -- 2.29.2
WARNING: multiple messages have this Message-ID (diff)
From: Ming Lei <ming.lei@redhat.com> To: Jens Axboe <axboe@kernel.dk> Cc: Mike Snitzer <snitzer@redhat.com>, Ming Lei <ming.lei@redhat.com>, linux-block@vger.kernel.org, dm-devel@redhat.com, Jeffle Xu <jefflexu@linux.alibaba.com> Subject: [dm-devel] [PATCH V6 10/12] block: limit hw queues to be polled in each blk_poll() Date: Thu, 22 Apr 2021 20:20:36 +0800 [thread overview] Message-ID: <20210422122038.2192933-11-ming.lei@redhat.com> (raw) In-Reply-To: <20210422122038.2192933-1-ming.lei@redhat.com> Limit at most 8 queues are polled in each blk_pull(), avoid to add extra latency when queue depth is high. Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> --- block/blk-poll.c | 78 ++++++++++++++++++++++++++++++++++-------------- 1 file changed, 55 insertions(+), 23 deletions(-) diff --git a/block/blk-poll.c b/block/blk-poll.c index 249d73ff6f81..20e7c47cc984 100644 --- a/block/blk-poll.c +++ b/block/blk-poll.c @@ -288,36 +288,32 @@ static void bio_grp_list_move(struct bio_grp_list *dst, src->nr_grps -= cnt; } -static int blk_mq_poll_io(struct bio *bio) +#define POLL_HCTX_MAX_CNT 8 + +static bool blk_add_unique_hctx(struct blk_mq_hw_ctx **data, int *cnt, + struct blk_mq_hw_ctx *hctx) { - struct request_queue *q = bio->bi_bdev->bd_disk->queue; - blk_qc_t cookie = bio_get_poll_data(bio); - int ret = 0; + int i; - /* wait until the bio is submitted really */ - if (!blk_qc_t_ready(cookie)) - return 0; - if (!bio_flagged(bio, BIO_DONE) && blk_qc_t_valid(cookie)) { - struct blk_mq_hw_ctx *hctx = - q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)]; + for (i = 0; i < *cnt; i++) { + if (data[i] == hctx) + goto exit; + } - ret += blk_mq_poll_hctx(q, hctx); + if (i < POLL_HCTX_MAX_CNT) { + data[i] = hctx; + (*cnt)++; } - return ret; + exit: + return *cnt == POLL_HCTX_MAX_CNT; } -static int blk_bio_poll_and_end_io(struct bio_grp_list *grps) +static void blk_build_poll_queues(struct bio_grp_list *grps, + struct blk_mq_hw_ctx **data, int *cnt) { - int ret = 0; int i; - /* - * Poll hw queue first. - * - * TODO: limit max poll times and make sure to not poll same - * hw queue one more time. - */ for (i = 0; i < grps->nr_grps; i++) { struct bio_grp_list_data *grp = &grps->head[i]; struct bio *bio; @@ -325,11 +321,31 @@ static int blk_bio_poll_and_end_io(struct bio_grp_list *grps) if (bio_grp_list_grp_empty(grp)) continue; - for (bio = grp->list.head; bio; bio = bio->bi_poll) - ret += blk_mq_poll_io(bio); + for (bio = grp->list.head; bio; bio = bio->bi_poll) { + blk_qc_t cookie; + struct blk_mq_hw_ctx *hctx; + struct request_queue *q; + + if (bio_flagged(bio, BIO_DONE)) + continue; + + /* wait until the bio is submitted really */ + cookie = bio_get_poll_data(bio); + if (!blk_qc_t_ready(cookie) || !blk_qc_t_valid(cookie)) + continue; + + q = bio->bi_bdev->bd_disk->queue; + hctx = q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)]; + if (blk_add_unique_hctx(data, cnt, hctx)) + return; + } } +} + +static void blk_bio_poll_reap_ios(struct bio_grp_list *grps) +{ + int i; - /* reap bios */ for (i = 0; i < grps->nr_grps; i++) { struct bio_grp_list_data *grp = &grps->head[i]; struct bio *bio; @@ -354,6 +370,22 @@ static int blk_bio_poll_and_end_io(struct bio_grp_list *grps) } __bio_grp_list_merge(&grp->list, &bl); } +} + +static int blk_bio_poll_and_end_io(struct bio_grp_list *grps) +{ + int ret = 0; + int i; + struct blk_mq_hw_ctx *hctx[POLL_HCTX_MAX_CNT]; + int cnt = 0; + + blk_build_poll_queues(grps, hctx, &cnt); + + for (i = 0; i < cnt; i++) + ret += blk_mq_poll_hctx(hctx[i]->queue, hctx[i]); + + blk_bio_poll_reap_ios(grps); + return ret; } -- 2.29.2 -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel
next prev parent reply other threads:[~2021-04-22 12:22 UTC|newest] Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-22 12:20 [PATCH V6 00/12] block: support bio based io polling Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-22 12:20 ` [PATCH V6 01/12] block: add helper of blk_queue_poll Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-22 12:20 ` [PATCH V6 02/12] block: define 'struct bvec_iter' as packed Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-22 13:18 ` Hannes Reinecke 2021-04-22 13:18 ` [dm-devel] " Hannes Reinecke 2021-04-22 12:20 ` [PATCH V6 03/12] block: add one helper to free io_context Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-22 12:20 ` [PATCH V6 04/12] block: move block polling code into one dedicated source file Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-22 13:19 ` Hannes Reinecke 2021-04-22 13:19 ` [dm-devel] " Hannes Reinecke 2021-04-26 7:12 ` Hannes Reinecke 2021-04-26 7:12 ` [dm-devel] " Hannes Reinecke 2021-04-22 12:20 ` [PATCH V6 05/12] block: extract one helper function polling hw queue Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-22 12:20 ` [PATCH V6 06/12] block: prepare for supporting bio_list via other link Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-22 12:20 ` [PATCH V6 07/12] block: create io poll context for submission and poll task Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-22 12:20 ` [PATCH V6 08/12] block: add req flag of REQ_POLL_CTX Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-22 12:20 ` [PATCH V6 09/12] block: use per-task poll context to implement bio based io polling Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-26 7:17 ` Hannes Reinecke 2021-04-26 7:17 ` [dm-devel] " Hannes Reinecke 2021-04-22 12:20 ` Ming Lei [this message] 2021-04-22 12:20 ` [dm-devel] [PATCH V6 10/12] block: limit hw queues to be polled in each blk_poll() Ming Lei 2021-04-26 7:19 ` Hannes Reinecke 2021-04-26 7:19 ` [dm-devel] " Hannes Reinecke 2021-04-26 8:00 ` Ming Lei 2021-04-26 8:00 ` [dm-devel] " Ming Lei 2021-04-26 9:05 ` Hannes Reinecke 2021-04-26 9:05 ` [dm-devel] " Hannes Reinecke 2021-04-22 12:20 ` [PATCH V6 11/12] block: allow to control FLAG_POLL via sysfs for bio poll capable queue Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-26 7:20 ` Hannes Reinecke 2021-04-26 7:20 ` [dm-devel] " Hannes Reinecke 2021-04-22 12:20 ` [PATCH V6 12/12] dm: support IO polling for bio-based dm device Ming Lei 2021-04-22 12:20 ` [dm-devel] " Ming Lei 2021-04-23 1:32 ` JeffleXu 2021-04-23 1:32 ` [dm-devel] " JeffleXu 2021-04-23 2:39 ` Ming Lei 2021-04-23 2:39 ` [dm-devel] " Ming Lei 2021-04-23 2:38 ` [PATCH V7 " Ming Lei 2021-04-23 2:38 ` [dm-devel] " Ming Lei 2021-05-17 6:16 ` [PATCH V6 00/12] block: support bio based io polling JeffleXu 2021-05-17 6:16 ` [dm-devel] " JeffleXu 2021-05-17 7:13 ` Ming Lei 2021-05-17 7:13 ` [dm-devel] " Ming Lei
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