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(unknown [109.105.118.124]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20240628084419epsmtip1090c41b2907317a7d61a46f553a83772~dHpU6dPxu0054500545epsmtip1u; Fri, 28 Jun 2024 08:44:18 +0000 (GMT) From: Chenliang Li To: axboe@kernel.dk, asml.silence@gmail.com Cc: io-uring@vger.kernel.org, peiwei.li@samsung.com, joshi.k@samsung.com, kundan.kumar@samsung.com, anuj20.g@samsung.com, gost.dev@samsung.com, Chenliang Li Subject: [PATCH v5 1/3] io_uring/rsrc: add hugepage fixed buffer coalesce helpers Date: Fri, 28 Jun 2024 16:44:09 +0800 Message-Id: <20240628084411.2371-2-cliang01.li@samsung.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240628084411.2371-1-cliang01.li@samsung.com> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprFJsWRmVeSWpSXmKPExsWy7bCmuq709vo0g23TVSyaJvxltpizahuj xeq7/WwWp/8+ZrG4eWAnk8W71nMsFkf/v2Wz+NV9l9Fi65evrBbP9nJanJ3wgdWB22PnrLvs HpfPlnr0bVnF6PF5k1wAS1S2TUZqYkpqkUJqXnJ+SmZeuq2Sd3C8c7ypmYGhrqGlhbmSQl5i bqqtkotPgK5bZg7QTUoKZYk5pUChgMTiYiV9O5ui/NKSVIWM/OISW6XUgpScApMCveLE3OLS vHS9vNQSK0MDAyNToMKE7Iz762oLZipVfLlR1MB4X7qLkZNDQsBEYt3/7+xdjFwcQgK7GSWe 3nrJDOF8YpT4vqkJyvnGKLHv6l82mJbFx6YwQST2MkpM3dcKVdXEJPHg+kEmkCo2AR2J3yt+ sYDYIgLaEq8fTwWzmQV2MUosPCcFYgsLBEusXrYPqJmDg0VAVeL1XjWQMK+AtcSZ9x8YIZbJ S+w/eJYZxOYUsJG4NH0WO0SNoMTJmU+gRspLNG+dDXaDhMBfdonnWy5ANbtIrFp3jQXCFpZ4 dXwLO4QtJfH53V42kL0SAsUSy9bJQfS2MEq8fzcHqtda4t+VPSwgNcwCmhLrd+lDhGUlpp5a xwSxl0+i9/cTJog4r8SOeTC2qsSFg9ugVklLrJ2wlRlilYfEogNqkKDqZ5S4vfwp6wRGhVlI 3pmF5J1ZCJsXMDKvYpRMLSjOTU9NNi0wzEsth0dxcn7uJkZwItVy2cF4Y/4/vUOMTByMhxgl OJiVRHj5M+vShHhTEiurUovy44tKc1KLDzGaAoN7IrOUaHI+MJXnlcQbmlgamJiZmZlYGpsZ Konzvm6dmyIkkJ5YkpqdmlqQWgTTx8TBKdXAdPOtzdVbcnNdz8UeWtiRKqc0NU6288MCsz6v 0KY9xtE3i6ffOjYx5NMhBbOf963kd+XE9khFGE88HHNq+v3HLpJds+1EJn/a+/novlWyrje+ 59p+bTAqv3H9QrXj/QlPusOa75/789voRVKglmZkaHXHsqKyZs7/LnIVkc3spUH/tdjsKuvq g/IEchfrrhCSP+tRKikR9uRv1FbvI6lJPa9ucew99/+1zaE1P6TZri0TbL9XVMneoFsceGP6 UnmJo5/v2M5kPftfOOHX1ZSDWitPPJPsFhIsNbq3niGntbw7rvCBxIu/THMnnKgys//AWrdl m2XunQDhr1MWas/YJbdp2owlyls1t042X/OjWomlOCPRUIu5qDgRAGxKyeYtBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrPLMWRmVeSWpSXmKPExsWy7bCSnO6T8ro0g6PHeS2aJvxltpizahuj xeq7/WwWp/8+ZrG4eWAnk8W71nMsFkf/v2Wz+NV9l9Fi65evrBbP9nJanJ3wgdWB22PnrLvs HpfPlnr0bVnF6PF5k1wASxSXTUpqTmZZapG+XQJXxv11tQUzlSq+3ChqYLwv3cXIySEhYCKx +NgUpi5GLg4hgd2MElM/3WOCSEhLdBxqZYewhSVW/nsOZgsJNDBJXFoWAmKzCehI/F7xi6WL kYNDREBXovGuAsgcZoFDjBLNG5oZQWqEBQIl5l2awQ5SwyKgKvF6rxpImFfAWuLM+w+MEOPl JfYfPMsMYnMK2Ehcmj4LrFwIqObD3UiIckGJkzOfsIDYzEDlzVtnM09gFJiFJDULSWoBI9Mq RsnUguLc9NxiwwLDvNRyveLE3OLSvHS95PzcTYzgMNfS3MG4fdUHvUOMTByMQCdzMCuJ8PJn 1qUJ8aYkVlalFuXHF5XmpBYfYpTmYFES5xV/0ZsiJJCeWJKanZpakFoEk2Xi4JRqYJpi/fT6 j/Q365f3rItlZlo8eXrFzNKTF/lLU048mmWycc/pTZkRTdYKC6exGqZ/1eVR+yLTf87pu8Pl yZPUDN7d74yvCFcv9F474/3uO4LfMu2u2nrMX5y1O2/GqrCzEvEdX4uLIjS7dHSe/NP9e/Gq UgJjv5LJr1c+6jIqL3fynxN9e6h43q9fn1csYdAoF+8N43ltq3VfWNJZdK6Gi/QSnfBrBXMb v14+E7hD+e6Rzz5fLPgncvHlpqeV8Kw38eLY/nVhrMxfk0WpK57setyUs/mTQerkZWtz88/m 5m9UeBn0x/fd9I1RGZtv+qcn1fSvrCvbH//daenfrlmuc42TZTyqX1w3+xmUHtTlbaHEUpyR aKjFXFScCACgrTN04gIAAA== X-CMS-MailID: 20240628084420epcas5p32f49e7c977695d20bcef7734eb2e38b4 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: 20240628084420epcas5p32f49e7c977695d20bcef7734eb2e38b4 References: <20240628084411.2371-1-cliang01.li@samsung.com> Introduce helper functions to check and coalesce hugepage-backed fixed buffers. The coalescing optimizes both time and space consumption caused by mapping and storing multi-hugepage fixed buffers. Currently we only have single-hugepage buffer coalescing, so add support for multi-hugepage fixed buffer coalescing. A coalescable multi-hugepage buffer should fully cover its folios (except potentially the first and last one), and these folios should have the same size. These requirements are for easier processing later, also we need same size'd chunks in io_import_fixed for fast iov_iter adjust. Signed-off-by: Chenliang Li --- io_uring/rsrc.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++ io_uring/rsrc.h | 9 +++++ 2 files changed, 96 insertions(+) diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index 60c00144471a..c88ce8c38515 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -849,6 +849,93 @@ static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, return ret; } +static bool io_do_coalesce_buffer(struct page ***pages, int *nr_pages, + struct io_imu_folio_data *data, int nr_folios) +{ + struct page **page_array = *pages, **new_array = NULL; + int nr_pages_left = *nr_pages, i, j; + + /* Store head pages only*/ + new_array = kvmalloc_array(nr_folios, sizeof(struct page *), + GFP_KERNEL); + if (!new_array) + return false; + + new_array[0] = page_array[0]; + /* + * The pages are bound to the folio, it doesn't + * actually unpin them but drops all but one reference, + * which is usually put down by io_buffer_unmap(). + * Note, needs a better helper. + */ + if (data->nr_pages_head > 1) + unpin_user_pages(&page_array[1], data->nr_pages_head - 1); + + j = data->nr_pages_head; + nr_pages_left -= data->nr_pages_head; + for (i = 1; i < nr_folios; i++) { + unsigned int nr_unpin; + + new_array[i] = page_array[j]; + nr_unpin = min_t(unsigned int, nr_pages_left - 1, + data->nr_pages_mid - 1); + if (nr_unpin) + unpin_user_pages(&page_array[j+1], nr_unpin); + j += data->nr_pages_mid; + nr_pages_left -= data->nr_pages_mid; + } + kvfree(page_array); + *pages = new_array; + *nr_pages = nr_folios; + return true; +} + +static bool io_try_coalesce_buffer(struct page ***pages, int *nr_pages, + struct io_imu_folio_data *data) +{ + struct page **page_array = *pages; + struct folio *folio = page_folio(page_array[0]); + unsigned int count = 1, nr_folios = 1; + int i; + + if (*nr_pages <= 1) + return false; + + data->nr_pages_mid = folio_nr_pages(folio); + if (data->nr_pages_mid == 1) + return false; + + data->folio_shift = folio_shift(folio); + data->folio_size = folio_size(folio); + /* + * Check if pages are contiguous inside a folio, and all folios have + * the same page count except for the head and tail. + */ + for (i = 1; i < *nr_pages; i++) { + if (page_folio(page_array[i]) == folio && + page_array[i] == page_array[i-1] + 1) { + count++; + continue; + } + + if (nr_folios == 1) + data->nr_pages_head = count; + else if (count != data->nr_pages_mid) + return false; + + folio = page_folio(page_array[i]); + if (folio_size(folio) != data->folio_size) + return false; + + count = 1; + nr_folios++; + } + if (nr_folios == 1) + data->nr_pages_head = count; + + return io_do_coalesce_buffer(pages, nr_pages, data, nr_folios); +} + static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, struct io_mapped_ubuf **pimu, struct page **last_hpage) diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h index c032ca3436ca..cc66323535f6 100644 --- a/io_uring/rsrc.h +++ b/io_uring/rsrc.h @@ -50,6 +50,15 @@ struct io_mapped_ubuf { struct bio_vec bvec[] __counted_by(nr_bvecs); }; +struct io_imu_folio_data { + /* Head folio can be partially included in the fixed buf */ + unsigned int nr_pages_head; + /* For non-head/tail folios, has to be fully included */ + unsigned int nr_pages_mid; + unsigned int folio_shift; + size_t folio_size; +}; + void io_rsrc_node_ref_zero(struct io_rsrc_node *node); void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node); struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx); -- 2.34.1