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Fri, 29 Jan 2021 13:04:46 +0900 (KST) Received: from localhost.localdomain (unknown [10.253.99.105]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20210129040446epsmtip290f8ecf54d30dfa0e34d7ed9a5b47543~emDjmFMm61343513435epsmtip2I; Fri, 29 Jan 2021 04:04:46 +0000 (GMT) From: Changheun Lee To: hch@infradead.org, Johannes.Thumshirn@wdc.com, asml.silence@gmail.com, axboe@kernel.dk, damien.lemoal@wdc.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, ming.lei@redhat.com, osandov@fb.com, patchwork-bot@kernel.org, tj@kernel.org, tom.leiming@gmail.com Cc: jisoo2146.oh@samsung.com, junho89.kim@samsung.com, mj0123.lee@samsung.com, seunghwan.hyun@samsung.com, sookwan7.kim@samsung.com, woosung2.lee@samsung.com, yt0928.kim@samsung.com, Changheun Lee Subject: [PATCH v4 1/2] bio: limit bio max size Date: Fri, 29 Jan 2021 12:49:08 +0900 Message-Id: <20210129034909.18785-1-nanich.lee@samsung.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA01Te0xbVRj33FtuC7F6V1COxDC8PMZQoF1XepRhZsaWq7JBID6HKV25Flxp a2/rK3Ni2RjtBoOBoMBAgfCaYwt7hEdgs2xOJmMYOtAtgAQGYQYwVJCHiG0vRP77ft/3e+Q7 DwEu6if8BOlaI2PQKjUU4cW72rVdHK6weKeIe5uCUXnjVYDODZ0m0PETCxj6Ob8KQ6fGzR5o 1TqMoflRFnXcfx71t5UTyFaYhaGSS+U4Ghjp4aOu4Xs8NFpTgKPe7jkPVDG2Gy3X3QRodnGQ j263FOLoQscSsduHLsia4dOtpUN8+lJ9GN1/x0Q3N1oIerbzHkHnXW4EtKPZnz5x/SSW4Pmu Zlcao0xlDAGMVqVLTdeqY6jXkxR7FLIosSRc8iKSUwFaZQYTQ8XGJYTvS9c416ICPlJqTM5W gpJlqciXdxl0JiMTkKZjjTEUo0/V6CVifQSrzGBNWnWESpfxkkQs3iFzMlM0abmrdkz/fegn jbnzeCa48qwVeAoguRP++90ysAIvgYhsAfDXgW4+B+YAXKxd4HFgAcBVax6xIWlfKV8fdAD4 w2D9ut4B4PWz83wXiyBfgHnT9wnXwIcsweD80k23MU6OAWjvznZ7eZORcM32t1vBI4NhX9Gc h6sWktHwy1EHzuVthQ9z63CuvwV2fzPOc9W4s591pQx3mUKyRwCzc8acA4ETxEL7rW2c1hs+ unWZz9V+0DHTQXD8kwBmZVcCDuQDWDNZi3EsKZxzOIDLCCe3wwttkVz7Odi6chZwwU/AmflT HlyWEOZkizhKEOw5NoJvZE2eb113pKF9rc/tKCLfg22Vh/LB1tJN25Ru2qb0/9xvAd4Inmb0 bIaaYSV66eZ7bQbu1x0mbwHF039G2AAmADYABTjlI5wuF6WIhKnKTz9jDDqFwaRhWBuQOc+3 APd7SqVzfg+tUSGR7ZBKpWhnlDxKJqV8hYfEvytEpFppZA4zjJ4xbOgwgadfJoaumY6UhM6p qn9jLTXHP16j41Oa4i2nc5IXAzPjfwqq7fRpTx87WjesqPpg3/KgBk3cWJ6UPhkpK/Ppjtqy rWviTG9QSNtCmejx9upX3txbYA95xhFaUFzB3tYnFffUVRZ9XX1j8GIgaFU/NluUmF28NPPa jPirvvfjE95KKfJT0ZT8ztu/RO0dfvDqFxP8NdmxgQfnE/nwYPDBlX+aUg83sP5TAb7vxAXl 1nr58/+Q5FpCzwTt6Uy29o7J979h/hxVWR/Zo0OMB+wfXmxriO2bigNm6RFcKkiKPFrXYGbv /nhuccS8QqhWzMkjIxW+1/4av5uYXx8TnTeVMJT8sNBDGEjx2DSlJAw3sMr/ACm+i79mBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpgkeLIzCtJLcpLzFFi42LZdlhJXjeuUzjBoHuulcWcVdsYLVbf7Wez aG3/xmRxesIiJoueJ02sFn+77jFZfH1YbLH3lrbF5V1z2CwOTW5mspi+eQ6zxbX7Z9gtDt+7 ymLxcMlEZotzJz+xWsx77GDxa/lRRov3P66zW5zaMZnZYv3en2wOIh4Tm9+xe+ycdZfdY/MK LY/LZ0s9Nq3qZPN4v+8qm0ffllWMHp83yXm0H+hmCuCM4rJJSc3JLEst0rdL4Mro/XuFqWCN RsWq3q/MDYxbZboYOTkkBEwkdv+ew9LFyMUhJLCbUeLhuwvsEAkpieMn3rJ2MXIA2cIShw8X Q9R8ZJSYs/I7I0gNm4CORN/bW2wgCRGB5UwSB36vZgVxmAVeM0p0PV7EAlIlLKAv8f/Qd7Cp LAKqEhemfGIFsXkFrCUaH35mhtgmL/G0dzkzRFxQ4uTMJ2C9zEDx5q2zmScw8s1CkpqFJLWA kWkVo2RqQXFuem6xYYFhXmq5XnFibnFpXrpecn7uJkZwJGlp7mDcvuqD3iFGJg7GQ4wSHMxK Irxv5wglCPGmJFZWpRblxxeV5qQWH2KU5mBREue90HUyXkggPbEkNTs1tSC1CCbLxMEp1cCU +PKUV5b4onvWWZmpkvEJ97clpZzgm/pJQfzwZ7XEXXIP393r0S9YbhPkWqDBlv7y6tZTO/W9 wrecumf5lOe7FuO0OXLHWG5JqLn7FK3M2L9p7aS17CGzd3OHzJRa+u/S1OZf18pMrYU3ht98 nt+3xbLq4+KcWac+KD5Qr8s8pSzKXPsj/uR5/fsBMd12Gr+P33KwntB2f9qm0NMrcoqr9r3J N3/dIOkb1GS91+/0w8aisxrZD7MjVphUWeSsz55oe8amPfL87GtszX9LuR7JX+Ww2sdesvSO ybduqz75zIrkqc+je/fejlE9f082d/mcxJMhuvefvd7h9E37UUmc0cE2HeNT3/ezht92iJZX YinOSDTUYi4qTgQATNzi4hMDAAA= X-CMS-MailID: 20210129040447epcas1p4531f0bf1ddebf0b469af87e85199cc43 X-Msg-Generator: CA X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20210129040447epcas1p4531f0bf1ddebf0b469af87e85199cc43 References: Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org bio size can grow up to 4GB when muli-page bvec is enabled. but sometimes it would lead to inefficient behaviors. in case of large chunk direct I/O, - 32MB chunk read in user space - all pages for 32MB would be merged to a bio structure if the pages physical addresses are contiguous. it makes some delay to submit until merge complete. bio max size should be limited to a proper size. When 32MB chunk read with direct I/O option is coming from userspace, kernel behavior is below now. it's timeline. | bio merge for 32MB. total 8,192 pages are merged. | total elapsed time is over 2ms. |------------------ ... ----------------------->| | 8,192 pages merged a bio. | at this time, first bio submit is done. | 1 bio is split to 32 read request and issue. |---------------> |---------------> |---------------> ...... |---------------> |--------------->| total 19ms elapsed to complete 32MB read done from device. | If bio max size is limited with 1MB, behavior is changed below. | bio merge for 1MB. 256 pages are merged for each bio. | total 32 bio will be made. | total elapsed time is over 2ms. it's same. | but, first bio submit timing is fast. about 100us. |--->|--->|--->|---> ... -->|--->|--->|--->|--->| | 256 pages merged a bio. | at this time, first bio submit is done. | and 1 read request is issued for 1 bio. |---------------> |---------------> |---------------> ...... |---------------> |--------------->| total 17ms elapsed to complete 32MB read done from device. | As a result, read request issue timing is faster if bio max size is limited. Current kernel behavior with multipage bvec, super large bio can be created. And it lead to delay first I/O request issue. Signed-off-by: Changheun Lee --- block/bio.c | 13 ++++++++++++- include/linux/bio.h | 2 +- include/linux/blkdev.h | 3 +++ 3 files changed, 16 insertions(+), 2 deletions(-) diff --git a/block/bio.c b/block/bio.c index 1f2cc1fbe283..c528e1f944c7 100644 --- a/block/bio.c +++ b/block/bio.c @@ -287,6 +287,17 @@ void bio_init(struct bio *bio, struct bio_vec *table, } EXPORT_SYMBOL(bio_init); +unsigned int bio_max_size(struct bio *bio) +{ + struct request_queue *q = bio->bi_disk->queue; + + if (blk_queue_limit_bio_size(q)) + return blk_queue_get_max_sectors(q, bio_op(bio)) + << SECTOR_SHIFT; + + return UINT_MAX; +} + /** * bio_reset - reinitialize a bio * @bio: bio to reset @@ -877,7 +888,7 @@ bool __bio_try_merge_page(struct bio *bio, struct page *page, struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt - 1]; if (page_is_mergeable(bv, page, len, off, same_page)) { - if (bio->bi_iter.bi_size > UINT_MAX - len) { + if (bio->bi_iter.bi_size > bio_max_size(bio) - len) { *same_page = false; return false; } diff --git a/include/linux/bio.h b/include/linux/bio.h index 1edda614f7ce..13b6f6562a5b 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -113,7 +113,7 @@ static inline bool bio_full(struct bio *bio, unsigned len) if (bio->bi_vcnt >= bio->bi_max_vecs) return true; - if (bio->bi_iter.bi_size > UINT_MAX - len) + if (bio->bi_iter.bi_size > bio_max_size(bio) - len) return true; return false; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f94ee3089e01..3aeab9e7e97b 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -621,6 +621,7 @@ struct request_queue { #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */ #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ +#define QUEUE_FLAG_LIMIT_BIO_SIZE 30 /* limit bio size */ #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_SAME_COMP) | \ @@ -667,6 +668,8 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags) +#define blk_queue_limit_bio_size(q) \ + test_bit(QUEUE_FLAG_LIMIT_BIO_SIZE, &(q)->queue_flags) extern void blk_set_pm_only(struct request_queue *q); extern void blk_clear_pm_only(struct request_queue *q); From patchwork Fri Jan 29 03:49:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Changheun Lee X-Patchwork-Id: 12055123 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 77084C433E0 for ; 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Fri, 29 Jan 2021 04:04:48 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20210129040448epsmtrp245af0a01e82c7b0a7f5c673073d94f5e~emDlcUR-80874008740epsmtrp2g; Fri, 29 Jan 2021 04:04:48 +0000 (GMT) X-AuditID: b6c32a35-c23ff70000010972-0f-60138961b2b1 Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id 12.39.08745.06983106; Fri, 29 Jan 2021 13:04:48 +0900 (KST) Received: from localhost.localdomain (unknown [10.253.99.105]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20210129040448epsmtip2574986e8da2ce63b8b7ea1c1373088af~emDlJFu1P1343513435epsmtip2J; Fri, 29 Jan 2021 04:04:48 +0000 (GMT) From: Changheun Lee To: hch@infradead.org, Johannes.Thumshirn@wdc.com, asml.silence@gmail.com, axboe@kernel.dk, damien.lemoal@wdc.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, ming.lei@redhat.com, osandov@fb.com, patchwork-bot@kernel.org, tj@kernel.org, tom.leiming@gmail.com Cc: jisoo2146.oh@samsung.com, junho89.kim@samsung.com, mj0123.lee@samsung.com, seunghwan.hyun@samsung.com, sookwan7.kim@samsung.com, woosung2.lee@samsung.com, yt0928.kim@samsung.com, Changheun Lee Subject: [PATCH v4 2/2] bio: add limit_bio_size sysfs Date: Fri, 29 Jan 2021 12:49:09 +0900 Message-Id: <20210129034909.18785-2-nanich.lee@samsung.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210129034909.18785-1-nanich.lee@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA02Ta1ATVxTH5+6GZGEaZlmw3vKhpTsyHaCBxJBwa8HS0dq1dkamTh+0H8IK 28AQkjQb+nSmKg81gJJBJ4IRsZVSKIGWV4EWR0BwKFhn5FGFQYhQA3aAlpQKAtokKy3f/uec 37n/e+6DwKlJcSiRoTdzJj2ro8UBopbuCJmMPRGcIj+SG4DsNS0AfTd+Sozyjv2Dof7irzBU OH3UD61b7mBoycmjjtEoNNhuF6OukhwM2RrtOBqZGJCg7jvDIuS8ZMXRr32Lfqh8KhE9rOoB aGH5Nwn6pbUER/UdK+LEEMaaMy9h2srGJUzjt5HM4PVspqHmhJhZuDwsZk421QDG3fAsc+xK AZbk/74uPp1j0zhTGKdPNaRl6LUJ9L4Dml0alVqukCleQnF0mJ7N4hLo3W8myfZk6Dxj0WEf s7psTyqJ5Xk6Zme8yZBt5sLSDbw5geaMaTqjQm6M5tksPluvjU41ZO1QyOXbVR4yRZf+8Ieb ImN1wKfTNXexw2CNsAB/ApKxsPfGY8wCAgiKbAXQNWHHhWARwNl7TX5C4AbwzP1Rv42WW90N YqHQDuCj5gXRf5RzMNdHickX4cm5UR8VQtowuLTSI/EGODkF4FBfvthLBZMqeLX/rk+LyHDo GujHvFpKvgwrOzslgt9z8PeiKtyr/cl4eLuiHAhMEOwrnRZ5Ne5hcprP4QI/Q8D19tcEvRt2 OCaAoIPh/WtNT9YMhe75Dt/uIFkAYE7+BSAExQBecn2DCZQSLrrdngLhcYiA9e0xQvp52LZ6 HgjGgXB+qdDPi0BSCo/nUwKyDQ7kTuAbXi5H25MVGXi5ttiXp8hTAJbYDMUgrGzTOGWbxin7 37gC4DXgac7IZ2k5XmFUbL7kBuB76pGqVmCd+zO6C2AE6AKQwOkQ6ZydSqGkaexnn3Mmg8aU reP4LqDyHLYVD92SavD8Fb1Zo1BtVyqVKFYdp1Yp6a3Sg/JJDUVqWTOXyXFGzrTRhxH+oYex T25fvPGKdVspt+UMwT42vzccdO5iU8Hx6pFZm2NHasQ7UZYiQ0rd5MDZipXAGGV9eE9CJzXS G1pYd/YF1+krO+1H91dPRUL70D2HEc1kAatz70H6j4mbiarAsdiW8fC1POstmKuqHLqa/4Em 9m+X7UvJ93lTbV11gT/K2D2zbwz2rj7KnHvr3dWxztONQwcUM0F5mYfW5i359gcf1TrXZyrb 3v6rqG5MjVFx7p9q83otq1hl8qF9gfjP0eoLxg+bd+154JBJ92vtcG6Z0drilhPZ6vbkqGRH lftIwdZy0evOZ8zGipBween1kkjLq0HU19fUC0+Fn/+icGoep1qHqmgRn84qInETz/4LRCWm HHMEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprGIsWRmVeSWpSXmKPExsWy7bCSvG5Cp3CCwbpLahZzVm1jtFh9t5/N orX9G5PF6QmLmCx6njSxWvztusdk8fVhscXeW9oWl3fNYbM4NLmZyWL65jnMFtfun2G3OHzv KovFwyUTmS3OnfzEajHvsYPFr+VHGS3e/7jObnFqx2Rmi/V7f7I5iHhMbH7H7rFz1l12j80r tDwuny312LSqk83j/b6rbB59W1YxenzeJOfRfqCbKYAzissmJTUnsyy1SN8ugSvj18ZLLAUr uSqerHrE1MD4h6OLkZNDQsBE4sbhTWwgtpDADkaJiy8NIOJSEsdPvGXtYuQAsoUlDh8u7mLk Air5yCixaPFXZpAaNgEdib63t9hAEiICy5kkDvxezQriMAu8ZpToeryIBaRKWMBU4sjpR2Ab WARUJZ6fOc0EYvMKWEssPXiQHWKbvMTT3uVgUzkFbCRuLpjHCLJZCKjm2yMtiHJBiZMzn4CN ZAYqb946m3kCo8AsJKlZSFILGJlWMUqmFhTnpucWGxYY5aWW6xUn5haX5qXrJefnbmIER52W 1g7GPas+6B1iZOJgPMQowcGsJML7do5QghBvSmJlVWpRfnxRaU5q8SFGaQ4WJXHeC10n44UE 0hNLUrNTUwtSi2CyTBycUg1MZxYrZfVN1TlzNWQxb/qMENmNWnbh/yUFlRYwxTW9XZE8YzuH 20SLhzbzsh7z3zu9dLlh269T/wL3+1Z+00gXm7jkwZNjGWucxFKzTvy44H/DLvXXhk12Rgw3 Pvac3HSSpWf2oc/ll31ym53mvVuzzPWEotKRNIfgA0yOjGtOy1yPfb6O9dertLczRRcftC4R 8f6/dGGVrmGilPudVPld9fMKPS/eybqvcnr7TSGV3xtncaeEPqt/vy70cvNJ6a31xgxZLzdW 9nxqXBGqlnz6yoLSnJNzn50on5twyUV7+tkzMkoZBvEVf/4tvLbpyDv1MwmTQtO7p533ZI/7 eU1R5CnDl9KpFzT2VE+qiZctzVFiKc5INNRiLipOBADQqmIrKQMAAA== X-CMS-MailID: 20210129040448epcas1p44da94c82ac4fb82d77c452bda56d6b09 X-Msg-Generator: CA X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20210129040448epcas1p44da94c82ac4fb82d77c452bda56d6b09 References: <20210129034909.18785-1-nanich.lee@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Add new sysfs node to limit bio size. Signed-off-by: Changheun Lee --- block/blk-sysfs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index b513f1683af0..840d97f427e6 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -288,6 +288,7 @@ QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); QUEUE_SYSFS_BIT_FNS(stable_writes, STABLE_WRITES, 0); +QUEUE_SYSFS_BIT_FNS(limit_bio_size, LIMIT_BIO_SIZE, 0); #undef QUEUE_SYSFS_BIT_FNS static ssize_t queue_zoned_show(struct request_queue *q, char *page) @@ -615,6 +616,7 @@ QUEUE_RW_ENTRY(queue_nonrot, "rotational"); QUEUE_RW_ENTRY(queue_iostats, "iostats"); QUEUE_RW_ENTRY(queue_random, "add_random"); QUEUE_RW_ENTRY(queue_stable_writes, "stable_writes"); +QUEUE_RW_ENTRY(queue_limit_bio_size, "limit_bio_size"); static struct attribute *queue_attrs[] = { &queue_requests_entry.attr, @@ -648,6 +650,7 @@ static struct attribute *queue_attrs[] = { &queue_rq_affinity_entry.attr, &queue_iostats_entry.attr, &queue_stable_writes_entry.attr, + &queue_limit_bio_size_entry.attr, &queue_random_entry.attr, &queue_poll_entry.attr, &queue_wc_entry.attr,