From nobody Wed Feb 11 08:25:47 2026 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 526991DF72C; Fri, 30 May 2025 08:09:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748592549; cv=none; b=jg6OvOs+849qQ57IL7K4GBcEpah0+/sqpUErDtvn7TfITA+jpeyG7uqGb/ngMilJhR/0GxA78W1aNhquNZ0YXE+pzwaESM4ZqcQjI48dX15lSmaDkhIEKBNF8VwGmNv60r61xd/ddM1cC5eyTEPhCX3YjxsKZ8aALtu10Zcxe0A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748592549; c=relaxed/simple; bh=wEQGdWGsmpfrovUYNN+akxZhK07M41/34FemLEAhQbE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=aY72xjTTRAcwKFTqrYuS1irtz3QyRelZwVleVmitupuRRbm8ZecFh70y5qAOn2nZhdNFsPnLoRHC/BfnnJCjQD7rbmAtJABYM3zs8Ss4tZIRqKrTViDNJbx7Cu0pmPIFXakO0xmEw0CwoTSZbwdwMPCFftjZZKfyrbtWNKsPPDA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.216]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTPS id 4b7wqk1w1WzYQvG4; Fri, 30 May 2025 16:09:06 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.252]) by mail.maildlp.com (Postfix) with ESMTP id 5488A1A01A0; Fri, 30 May 2025 16:09:05 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP3 (Coremail) with SMTP id _Ch0CgAne8WfZzloSi3_Ng--.6274S5; Fri, 30 May 2025 16:09:05 +0800 (CST) From: Yu Kuai To: axboe@kernel.dk Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawei.com, johnny.chenyi@huawei.com Subject: [PATCH RFC 1/4] elevator: introduce global lock for sq_shared elevator Date: Fri, 30 May 2025 16:03:52 +0800 Message-Id: <20250530080355.1138759-2-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250530080355.1138759-1-yukuai1@huaweicloud.com> References: <20250530080355.1138759-1-yukuai1@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _Ch0CgAne8WfZzloSi3_Ng--.6274S5 X-Coremail-Antispam: 1UD129KBjvJXoWxCF45GF4fuF48AF4xtrWDurg_yoWrtF4kpF 45Jan0kr4qqr47Za4xAa17Jw43t3929ry3ZrWfAw45tFyxGrWxXF18GFy8ZF4xZrs3CFsF qr4ktFZ8WFyIg3DanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBG14x267AKxVW5JVWrJwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jr4l82xGYIkIc2 x26xkF7I0E14v26r1I6r4UM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJw A2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq3wAS 0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2 IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0 Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwCY1x0262kKe7AKxVWUAVWUtw CF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j 6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64 vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_ Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0x vEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUfDGrUUUUU= X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ Content-Type: text/plain; charset="utf-8" From: Yu Kuai Currently, both mq-deadline and bfq have internal global lock, prepare to convert them to use this high level lock and support batch request dispatching. Signed-off-by: Yu Kuai --- block/blk-mq-sched.c | 4 +-- block/blk-mq.c | 5 ++-- block/elevator.c | 1 + block/elevator.h | 61 ++++++++++++++++++++++++++++++++++++++++++-- 4 files changed, 64 insertions(+), 7 deletions(-) diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index 55a0fd105147..c1390d3e6381 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -113,7 +113,7 @@ static int __blk_mq_do_dispatch_sched(struct blk_mq_hw_= ctx *hctx) if (budget_token < 0) break; =20 - rq =3D e->type->ops.dispatch_request(hctx); + rq =3D elevator_dispatch_request(hctx); if (!rq) { blk_mq_put_dispatch_budget(q, budget_token); /* @@ -342,7 +342,7 @@ bool blk_mq_sched_bio_merge(struct request_queue *q, st= ruct bio *bio, enum hctx_type type; =20 if (e && e->type->ops.bio_merge) { - ret =3D e->type->ops.bio_merge(q, bio, nr_segs); + ret =3D elevator_bio_merge(q, bio, nr_segs); goto out_put; } =20 diff --git a/block/blk-mq.c b/block/blk-mq.c index 4806b867e37d..2650b7b28d1e 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2637,7 +2637,7 @@ static void blk_mq_insert_request(struct request *rq,= blk_insert_t flags) WARN_ON_ONCE(rq->tag !=3D BLK_MQ_NO_TAG); =20 list_add(&rq->queuelist, &list); - q->elevator->type->ops.insert_requests(hctx, &list, flags); + elevator_insert_requests(hctx, &list, flags); } else { trace_block_rq_insert(rq); =20 @@ -2912,8 +2912,7 @@ static void blk_mq_dispatch_list(struct rq_list *rqs,= bool from_sched) spin_unlock(&this_hctx->lock); blk_mq_run_hw_queue(this_hctx, from_sched); } else if (this_hctx->queue->elevator) { - this_hctx->queue->elevator->type->ops.insert_requests(this_hctx, - &list, 0); + elevator_insert_requests(this_hctx, &list, 0); blk_mq_run_hw_queue(this_hctx, from_sched); } else { blk_mq_insert_requests(this_hctx, this_ctx, &list, from_sched); diff --git a/block/elevator.c b/block/elevator.c index ab22542e6cf0..91df270d9d91 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -144,6 +144,7 @@ struct elevator_queue *elevator_alloc(struct request_qu= eue *q, eq->type =3D e; kobject_init(&eq->kobj, &elv_ktype); mutex_init(&eq->sysfs_lock); + spin_lock_init(&eq->lock); hash_init(eq->hash); =20 return eq; diff --git a/block/elevator.h b/block/elevator.h index a07ce773a38f..8399dfe5c3b6 100644 --- a/block/elevator.h +++ b/block/elevator.h @@ -110,12 +110,12 @@ struct request *elv_rqhash_find(struct request_queue = *q, sector_t offset); /* * each queue has an elevator_queue associated with it */ -struct elevator_queue -{ +struct elevator_queue { struct elevator_type *type; void *elevator_data; struct kobject kobj; struct mutex sysfs_lock; + spinlock_t lock; unsigned long flags; DECLARE_HASHTABLE(hash, ELV_HASH_BITS); }; @@ -186,4 +186,61 @@ extern struct request *elv_rb_find(struct rb_root *, s= ector_t); void blk_mq_sched_reg_debugfs(struct request_queue *q); void blk_mq_sched_unreg_debugfs(struct request_queue *q); =20 +#define elevator_lock(e) spin_lock_irq(&(e)->lock) +#define elevator_unlock(e) spin_unlock_irq(&(e)->lock) + +static inline struct request *elevator_dispatch_request( + struct blk_mq_hw_ctx *hctx) +{ + struct request_queue *q =3D hctx->queue; + struct elevator_queue *e =3D q->elevator; + bool sq_shared =3D blk_queue_sq_sched(q); + struct request *rq; + + if (sq_shared) + elevator_lock(e); + + rq =3D e->type->ops.dispatch_request(hctx); + + if (sq_shared) + elevator_unlock(e); + + return rq; +} + +static inline void elevator_insert_requests(struct blk_mq_hw_ctx *hctx, + struct list_head *list, + blk_insert_t flags) +{ + struct request_queue *q =3D hctx->queue; + struct elevator_queue *e =3D q->elevator; + bool sq_shared =3D blk_queue_sq_sched(q); + + if (sq_shared) + elevator_lock(e); + + e->type->ops.insert_requests(hctx, list, flags); + + if (sq_shared) + elevator_unlock(e); +} + +static inline bool elevator_bio_merge(struct request_queue *q, struct bio = *bio, + unsigned int nr_segs) +{ + struct elevator_queue *e =3D q->elevator; + bool sq_shared =3D blk_queue_sq_sched(q); + bool ret; + + if (sq_shared) + elevator_lock(e); + + ret =3D e->type->ops.bio_merge(q, bio, nr_segs); + + if (sq_shared) + elevator_unlock(e); + + return ret; +} + #endif /* _ELEVATOR_H */ --=20 2.39.2