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Thu, 14 Nov 2024 14:01:34 +0000 (GMT) Received: from epsmgmc1p1new.samsung.com (unknown [182.195.42.40]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20241114140134epsmtrp1a9436982252c6e38c04f321cbc61e19e~H2pAb0sUi2972229722epsmtrp1G; Thu, 14 Nov 2024 14:01:34 +0000 (GMT) X-AuditID: b6c32a50-1f9ff70000023b73-39-673618beb732 Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgmc1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id A4.36.07371.EB206376; Thu, 14 Nov 2024 23:01:34 +0900 (KST) Received: from localhost.localdomain (unknown [107.99.41.245]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20241114140132epsmtip1eb2a916422b7a21fd4ef5790ce8b1199~H2o_zPRC71199611996epsmtip1U; Thu, 14 Nov 2024 14:01:32 +0000 (GMT) From: Chinmay Gameti To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, joshi.k@samsung.com, anuj20.g@samsung.com, nj.shetty@samsung.com, kundan.kumar@samsung.com, gost.dev@samsung.com, Chinmay Gameti Subject: [PATCH] block: add larger order folio instead of pages for passthrough I/O Date: Thu, 14 Nov 2024 19:23:35 +0530 Message-Id: <20241114135335.21327-1-c.gameti@samsung.com> X-Mailer: git-send-email 2.25.1 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-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprOJsWRmVeSWpSXmKPExsWy7bCmlu4+CbN0g4YNvBZNE/4yW6y+289m 8X17H4vFzQM7mSxWrj7KZHH0/1s2i0mHrjFabP3yldVi7y1ti8u75rBZbPs9n9mB2+Py2VKP Tas62Tx232xg8+jbsorR4/MmuQDWqGybjNTElNQihdS85PyUzLx0WyXv4HjneFMzA0NdQ0sL cyWFvMTcVFslF58AXbfMHKDDlBTKEnNKgUIBicXFSvp2NkX5pSWpChn5xSW2SqkFKTkFJgV6 xYm5xaV56Xp5qSVWhgYGRqZAhQnZGV2fbjEXPFGtWDVjJlMD4ySZLkZODgkBE4lr19ewdzFy cQgJ7GGUeHGhnxXC+cQocePGZCYI5xujxJo3s5lgWp5Oew7VspdR4ujCRywQzmdGiX//9rOB VLEJaEv8W7mOHcQWETCS2P/pJNhcZoE7jBLX5n9iBUkIC4RKTHo7E8xmEVCVaD90gxnE5hWw lGg/eZMZYp28xMxL39kh4oISJ2c+YQGxmYHizVtnM4MMlRB4xC5x9+M+RogGF4mf+x+yQNjC Eq+Ob2GHsKUkXva3AdkcQHa+xJ9FSRDhEomeXTPZIGx7idZT/cwgJcwCmhLrd+lDhGUlpp5a xwSxlk+i9/cTaEjwSuyYB2MrSSzd9QHqZAmJpZ/7WCFsD4k163aAXSYkECvx6WMHywRG+VlI vpmF5JtZCJsXMDKvYpRKLSjOTU9NNi0w1M1LLYdHbXJ+7iZGcArVCtjBuHrDX71DjEwcjIcY JTiYlUR4TzkbpwvxpiRWVqUW5ccXleakFh9iNAWG8URmKdHkfGASzyuJNzSxNDAxMzMzsTQ2 M1QS533dOjdFSCA9sSQ1OzW1ILUIpo+Jg1OqgWnWX9tLoqVZ7UWcli+faO7wZubri5surb9n 32k71s3NC9k4Es+en9/vt2/Rqldv78t3GQYoSvSktnmVSEwTuZYeftz94rpJLtPVLgWVzX+o +uj0z/sptzcLBJpOMGHk2rS1yeCf4CqXKR9TazuvG4fMvR77zvHoWYbAI71pfCftFrI/Vud1 sv5R8fFEgHt+k+g03w+/uOfs6Gnma7366Mjm6UXxMoeDHQsXa+l2uL76V1JbEp5fE/jY5m5u 1jwbrRqblhv3Cru+uV+rK1hVzf/fkjv5mpCs5pItR2d5XVeLbdm7p2Mhb3iVTLNNbdC+feY1 xydPO6yz+kHhVZv23d7vLArnpvf93XqU7eQKYyWW4oxEQy3mouJEAMaZKpUqBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrILMWRmVeSWpSXmKPExsWy7bCSnO4+JrN0g0832SyaJvxltlh9t5/N 4vv2PhaLmwd2MlmsXH2UyeLo/7dsFpMOXWO02PrlK6vF3lvaFpd3zWGz2PZ7PrMDt8fls6Ue m1Z1snnsvtnA5tG3ZRWjx+dNcgGsUVw2Kak5mWWpRfp2CVwZXZ9uMRc8Ua1YNWMmUwPjJJku Rk4OCQETiafTnrN3MXJxCAnsZpS4cL+ZHSIhIfH2+lFmCFtYYuU/mKKPjBLXbi9hBUmwCWhL /Fu5DqxBRMBMYunhNSwgNrPAE0aJHd8rQWxhgWCJZWe3gNWzCKhKtB+6ATaUV8BSov3kTagF 8hIzL31nh4gLSpyc+QRqjrxE89bZzBMY+WYhSc1CklrAyLSKUTK1oDg3PTfZsMAwL7Vcrzgx t7g0L10vOT93EyM4lLU0djDem/9P7xAjEwfjIUYJDmYlEd5TzsbpQrwpiZVVqUX58UWlOanF hxilOViUxHkNZ8xOERJITyxJzU5NLUgtgskycXBKNTBdjW33aGcWnHvHSeTJj8przKtDljVv /WJrnrrmw+VN81gzUk+6Ppo6W2zNbC/HE7O5E7aUW0y0CV8q/0Bh5u6IY057530K3v3JdVEZ o/3zevn6WxcunTifN4m/n/t7D9/SJXmFgls+HSzrStml9fmDR+P1X5IOy/49Vu57Zbrwr9P2 jpjYaj5b/dd7zRe+FpOOfKw0Qe/ardrNrt3z3wq9eKcbx7rGdPaLtwGhnBwfeE60PNKNZiti vhUo8+P6jAB+3yd8f4ovNxqfLzlzUvF7mmaqyxG3bVZSpbpatdOXvJl3ft9FhUaBFYzzHpl9 7gmYrMPzUGUGX5nKynCeyRPMZ9WK/u1Y6nlfr2zfZbN1SizFGYmGWsxFxYkAb57SqdQCAAA= X-CMS-MailID: 20241114140134epcas5p3474e82266c4c117919a920d1dd4ed410 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: 20241114140134epcas5p3474e82266c4c117919a920d1dd4ed410 References: This patch supports adding a large folio to bio for passthrough I/Os, when mTHP is enabled. Similar to block I/O folio changes [1]. These changes reduce the overhead incurred by bio_map_user_iov for passthrough I/O. Perf diff before and after this change: perf diff for write I/O with 64K block size: 0.84% -0.49% [kernel.kallsyms] [k] bio_map_user_iov 1.23% [kernel.kallsyms] [k] bvec_try_merge_page 0.88% [kernel.kallsyms] [k] bvec_try_merge_hw_page perf diff for read I/O with 64K block size: 1.74% -1.1% [kernel.kallsyms] [k] bio_map_user_iov 2.39% [kernel.kallsyms] [k] bvec_try_merge_page 1.74% [kernel.kallsyms] [k] bvec_try_merge_hw_page perf diff for write I/O with 128K block size: 0.84% -0.6% [kernel.kallsyms] [k] bio_map_user_iov 1.49% [kernel.kallsyms] [k] bvec_try_merge_page 1.19% [kernel.kallsyms] [k] bvec_try_merge_hw_page perf diff for read I/O with 128K block size: 2.35% -1.56% [kernel.kallsyms] [k] bio_map_user_iov 4.53% [kernel.kallsyms] [k] bvec_try_merge_page 3.39% [kernel.kallsyms] [k] bvec_try_merge_hw_page [1] commit ed9832bc08db ("block: introduce folio awareness and add a bigger size from folio") Signed-off-by: Chinmay Gameti Signed-off-by: Kundan Kumar --- block/bio.c | 8 ++++---- block/blk-map.c | 31 +++++++++++++++++++++++-------- include/linux/bio.h | 4 ++++ 3 files changed, 31 insertions(+), 12 deletions(-) diff --git a/block/bio.c b/block/bio.c index 699a78c85c75..50e8b565f368 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1203,10 +1203,10 @@ static int bio_iov_add_folio(struct bio *bio, struc= t folio *folio, size_t len, return 0; } =20 -static unsigned int get_contig_folio_len(unsigned int *num_pages, - struct page **pages, unsigned int i, - struct folio *folio, size_t left, - size_t offset) +unsigned int get_contig_folio_len(unsigned int *num_pages, + struct page **pages, unsigned int i, + struct folio *folio, size_t left, + size_t offset) { size_t bytes =3D left; size_t contig_sz =3D min_t(size_t, PAGE_SIZE - offset, bytes); diff --git a/block/blk-map.c b/block/blk-map.c index b5fd1d857461..216d08c8b0de 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -295,8 +295,9 @@ static int bio_map_user_iov(struct request *rq, struct = iov_iter *iter, struct page *stack_pages[UIO_FASTIOV]; struct page **pages =3D stack_pages; ssize_t bytes; - size_t offs; int npages; + unsigned int num_pages; + size_t offs, folio_offset, len; =20 if (nr_vecs > ARRAY_SIZE(stack_pages)) pages =3D NULL; @@ -313,21 +314,35 @@ static int bio_map_user_iov(struct request *rq, struc= t iov_iter *iter, if (unlikely(offs & queue_dma_alignment(rq->q))) j =3D 0; else { - for (j =3D 0; j < npages; j++) { + for (j =3D 0; j < npages; j +=3D num_pages) { struct page *page =3D pages[j]; - unsigned int n =3D PAGE_SIZE - offs; + struct folio *folio =3D page_folio(page); bool same_page =3D false; =20 - if (n > bytes) - n =3D bytes; =20 - if (!bio_add_hw_page(rq->q, bio, page, n, offs, - max_sectors, &same_page)) + folio_offset =3D ((size_t)folio_page_idx(folio, + page) << PAGE_SHIFT) + offs; + + len =3D min(folio_size(folio) - folio_offset, + (size_t)bytes); + + num_pages =3D DIV_ROUND_UP(offs + len, + PAGE_SIZE); + + if (num_pages > 1) + len =3D get_contig_folio_len( + &num_pages, pages, j, + folio, (size_t)bytes, + offs); + + if (!bio_add_hw_folio(rq->q, bio, folio, len, + folio_offset, max_sectors, + &same_page)) break; =20 if (same_page) bio_release_page(bio, page); - bytes -=3D n; + bytes -=3D len; offs =3D 0; } } diff --git a/include/linux/bio.h b/include/linux/bio.h index 60830a6a5939..1e5fbc875ecc 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -422,6 +422,10 @@ void __bio_add_page(struct bio *bio, struct page *page, unsigned int len, unsigned int off); void bio_add_folio_nofail(struct bio *bio, struct folio *folio, size_t len, size_t off); +unsigned int get_contig_folio_len(unsigned int *num_pages, + struct page **pages, unsigned int i, + struct folio *folio, size_t left, + size_t offset); int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter); void bio_iov_bvec_set(struct bio *bio, struct iov_iter *iter); void __bio_release_pages(struct bio *bio, bool mark_dirty); --=20 2.34.1