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Wed, 9 Mar 2022 00:42:43 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas5p4.samsung.com (KnoxPortal) with ESMTPA id 20220308152714epcas5p4c5a0d16512fd7054c9a713ee28ede492~acVdtyQMf1840518405epcas5p4T; Tue, 8 Mar 2022 15:27:14 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20220308152714epsmtrp138c5015c6abd95afe5165a8e81305e9b~acVdtABXk0125001250epsmtrp1Z; Tue, 8 Mar 2022 15:27:14 +0000 (GMT) X-AuditID: b6c32a4b-739ff700000015d6-52-6227797340bb Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id FA.96.03370.1D577226; Wed, 9 Mar 2022 00:27:13 +0900 (KST) Received: from localhost.localdomain (unknown [107.110.206.5]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20220308152711epsmtip16a2a58aa2b7d39548f005e0fddf6732a~acVbohUIj3168431684epsmtip1E; Tue, 8 Mar 2022 15:27:11 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org, asml.silence@gmail.com Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, sbates@raithlin.com, logang@deltatee.com, pankydev8@gmail.com, javier@javigon.com, mcgrof@kernel.org, a.manzanares@samsung.com, joshiiitr@gmail.com, anuj20.g@samsung.com Subject: [PATCH 10/17] block: wire-up support for plugging Date: Tue, 8 Mar 2022 20:50:58 +0530 Message-Id: <20220308152105.309618-11-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220308152105.309618-1-joshi.k@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrHJsWRmVeSWpSXmKPExsWy7bCmpm5xpXqSQe9TdYvphxUtmib8ZbaY s2obo8Xqu/1sFitXH2WyeNd6jsWi8/QFJovzbw8zWUw6dI3RYu8tbYv5y56yWyxpPc5mcWPC U0aLNTefslh8PjOP1YHf49nVZ4weO2fdZfdoXnCHxePy2VKPTas62Tw2L6n32H2zgc1j2+KX rB59W1YxenzeJBfAFZVtk5GamJJapJCal5yfkpmXbqvkHRzvHG9qZmCoa2hpYa6kkJeYm2qr 5OIToOuWmQP0g5JCWWJOKVAoILG4WEnfzqYov7QkVSEjv7jEVim1ICWnwKRArzgxt7g0L10v L7XEytDAwMgUqDAhO+PL4Q+MBQfkKu79mMDYwDhHsouRk0NCwETi+u5XbF2MXBxCArsZJW5s P8MC4XxilLjXv4YdwvnMKLG1fQIrTMuZHTuZIBK7GCW+d3awgyTAqh7uiexi5OBgE9CUuDC5 FCQsIuAlcf/2e1aQemaBLiaJt/vus4EkhAWsJLasf88MYrMIqEq8m3EBzOYFil+Y85sNYpm8 xMxL38HmcwLFf97aygpRIyhxcuYTFhCbGaimeetsZpAFEgIHOCRaV76HutRF4mjrciYIW1ji 1fEt7BC2lMTL/jYou1ji152jUM0djBLXG2ayQCTsJS7u+csE8g0z0Dfrd+lDhGUlpp5axwSx mE+i9/cTqPm8EjvmwdiKEvcmPYW6QVzi4YwlULaHxJM3B5khIdfLKDF5bSPbBEaFWUgemoXk oVkIqxcwMq9ilEwtKM5NTy02LTDOSy2HR3Nyfu4mRnDC1vLewfjowQe9Q4xMHIyHGCU4mJVE eO+fV0kS4k1JrKxKLcqPLyrNSS0+xGgKDPGJzFKiyfnAnJFXEm9oYmlgYmZmZmJpbGaoJM57 Kn1DopBAemJJanZqakFqEUwfEwenVAOTpG2Tolfbox0TnM+9fq0bHHIq98l2ftb/L+ZG1M0X cpMKvJvxcueh3WFpV40fnN98vFr+70kGtr1PF3hqFzNJegqzctZUnSo9OqPmyxOvcyvrakuD nDi1efVrJjK8dhHa8zWxaVaKw4/nZ/9PWChgz3CqwyU5f1tJ0xzHf5bn+8SSQ3bPcKz7Fnmc QUK59PkVC91ZOg5Rxzo/mV0M+Ge9aMGzw6+/nvD54Jh8XdcpacPZ9KrW1XKnp2h7314kuu/3 rmfmE9dWK/vvXHxP3+yPspBp1+2AiyujLRNrJm/a/OrdJPmN34vndRp3PU8tc5z3akmWudJM g2dLwk86HV0j7z9j3zPWWOFZzXO+KJ3fr8RSnJFoqMVcVJwIAN0QxIxhBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpmkeLIzCtJLcpLzFFi42LZdlhJTvdiqXqSwcc7lhbTDytaNE34y2wx Z9U2RovVd/vZLFauPspk8a71HItF5+kLTBbn3x5msph06Bqjxd5b2hbzlz1lt1jSepzN4saE p4wWa24+ZbH4fGYeqwO/x7Orzxg9ds66y+7RvOAOi8fls6Uem1Z1snlsXlLvsftmA5vHtsUv WT36tqxi9Pi8SS6AK4rLJiU1J7MstUjfLoEr48vhD4wFB+Qq7v2YwNjAOEeyi5GTQ0LAROLM jp1MILaQwA5GiXWtvhBxcYnmaz/YIWxhiZX/ngPZXEA1Hxkl1i+dx9zFyMHBJqApcWFyKUiN iECAxMHGy2A1zAIzmCR6mj+zgCSEBawktqx/zwxiswioSrybcQHM5gWKX5jzmw1igbzEzEvf wZZxAsV/3trKCnGQpcSKdRA1vAKCEidnPgGbyQxU37x1NvMERoFZSFKzkKQWMDKtYpRMLSjO Tc8tNiwwykst1ytOzC0uzUvXS87P3cQIjictrR2Me1Z90DvEyMTBeIhRgoNZSYT3/nmVJCHe lMTKqtSi/Pii0pzU4kOM0hwsSuK8F7pOxgsJpCeWpGanphakFsFkmTg4pRqYauInfdeNnmtt VrlP61G8hM2l5IjvlXeLF+45yNOskMy3MTnywm2G5mCjt+u2TfnH9tTTbmvMjimhWisj79Yc b2w4ZhI0Q25v7FKtPx0tRy/q1+VEtEq7/uNcsPJS2tFplbt8Ny3apRN5IkHi18Hm6w/KQ/qn xgWWHYpcFeVQWp6y/NOzTz88fUzvVGyLPCuwR7bHkHnXnCwj2b1zGpc9t54yySZveadmZffJ nf/sr/GKfVebZeavySkePslH/vfvDXwCPzOE2T5N/OKbcCHLffvOu0+Dc8rPRk7RebtImqfb 8tfmlulB2n2PJgZbFa979GkND4vAmw0NNXxFn9lbwt+x/Zp0X0dCytbbKEhdiaU4I9FQi7mo OBEAk9OYNxYDAAA= X-CMS-MailID: 20220308152714epcas5p4c5a0d16512fd7054c9a713ee28ede492 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220308152714epcas5p4c5a0d16512fd7054c9a713ee28ede492 References: <20220308152105.309618-1-joshi.k@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Jens Axboe Add support to use plugging if it is enabled, else use default path. Signed-off-by: Jens Axboe --- block/blk-mq.c | 90 ++++++++++++++++++++++++++------------------------ 1 file changed, 47 insertions(+), 43 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 1adfe4824ef5..29f65eaf3e6b 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2326,6 +2326,40 @@ void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, blk_mq_hctx_mark_pending(hctx, ctx); } +/* + * Allow 2x BLK_MAX_REQUEST_COUNT requests on plug queue for multiple + * queues. This is important for md arrays to benefit from merging + * requests. + */ +static inline unsigned short blk_plug_max_rq_count(struct blk_plug *plug) +{ + if (plug->multiple_queues) + return BLK_MAX_REQUEST_COUNT * 2; + return BLK_MAX_REQUEST_COUNT; +} + +static void blk_add_rq_to_plug(struct blk_plug *plug, struct request *rq) +{ + struct request *last = rq_list_peek(&plug->mq_list); + + if (!plug->rq_count) { + trace_block_plug(rq->q); + } else if (plug->rq_count >= blk_plug_max_rq_count(plug) || + (!blk_queue_nomerges(rq->q) && + blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE)) { + blk_mq_flush_plug_list(plug, false); + trace_block_plug(rq->q); + } + + if (!plug->multiple_queues && last && last->q != rq->q) + plug->multiple_queues = true; + if (!plug->has_elevator && (rq->rq_flags & RQF_ELV)) + plug->has_elevator = true; + rq->rq_next = NULL; + rq_list_add(&plug->mq_list, rq); + plug->rq_count++; +} + /** * blk_mq_request_bypass_insert - Insert a request at dispatch list. * @rq: Pointer to request to be inserted. @@ -2339,16 +2373,20 @@ void blk_mq_request_bypass_insert(struct request *rq, bool at_head, bool run_queue) { struct blk_mq_hw_ctx *hctx = rq->mq_hctx; + struct blk_plug *plug = current->plug; - spin_lock(&hctx->lock); - if (at_head) - list_add(&rq->queuelist, &hctx->dispatch); - else - list_add_tail(&rq->queuelist, &hctx->dispatch); - spin_unlock(&hctx->lock); - - if (run_queue) - blk_mq_run_hw_queue(hctx, false); + if (plug) { + blk_add_rq_to_plug(plug, rq); + } else { + spin_lock(&hctx->lock); + if (at_head) + list_add(&rq->queuelist, &hctx->dispatch); + else + list_add_tail(&rq->queuelist, &hctx->dispatch); + spin_unlock(&hctx->lock); + if (run_queue) + blk_mq_run_hw_queue(hctx, false); + } } void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, @@ -2666,40 +2704,6 @@ void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx, hctx->queue->mq_ops->commit_rqs(hctx); } -/* - * Allow 2x BLK_MAX_REQUEST_COUNT requests on plug queue for multiple - * queues. This is important for md arrays to benefit from merging - * requests. - */ -static inline unsigned short blk_plug_max_rq_count(struct blk_plug *plug) -{ - if (plug->multiple_queues) - return BLK_MAX_REQUEST_COUNT * 2; - return BLK_MAX_REQUEST_COUNT; -} - -static void blk_add_rq_to_plug(struct blk_plug *plug, struct request *rq) -{ - struct request *last = rq_list_peek(&plug->mq_list); - - if (!plug->rq_count) { - trace_block_plug(rq->q); - } else if (plug->rq_count >= blk_plug_max_rq_count(plug) || - (!blk_queue_nomerges(rq->q) && - blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE)) { - blk_mq_flush_plug_list(plug, false); - trace_block_plug(rq->q); - } - - if (!plug->multiple_queues && last && last->q != rq->q) - plug->multiple_queues = true; - if (!plug->has_elevator && (rq->rq_flags & RQF_ELV)) - plug->has_elevator = true; - rq->rq_next = NULL; - rq_list_add(&plug->mq_list, rq); - plug->rq_count++; -} - static bool blk_mq_attempt_bio_merge(struct request_queue *q, struct bio *bio, unsigned int nr_segs) { -- 2.25.1