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GET /api/1.1/patches/2230790/?format=api
{ "id": 2230790, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230790/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260430040427.4672-3-baohua@kernel.org/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.1/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/" }, "msgid": "<20260430040427.4672-3-baohua@kernel.org>", "date": "2026-04-30T04:04:24", "name": "[v2,2/5] mm/swapin: Retry swapin by VMA lock if the lock was released for I/O", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "dc2ce785fb1411ba0bed39735347bdbae5475e36", "submitter": { "id": 48512, "url": "http://patchwork.ozlabs.org/api/1.1/people/48512/?format=api", "name": "Barry Song", "email": "baohua@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260430040427.4672-3-baohua@kernel.org/mbox/", "series": [ { "id": 502184, "url": "http://patchwork.ozlabs.org/api/1.1/series/502184/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=502184", "date": "2026-04-30T04:04:27", "name": "mm: reduce mmap_lock contention and improve page fault performance", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/502184/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230790/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230790/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20329-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=mKwVglCF;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1777521903;\n\tbh=3UzddeMl13pC5cJUrT4HHkjYBFF8Z0grqJoknqLkHzk=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=mKwVglCF7XEsFftOn0BAtLwGM5IZ72wXKgPaG3s9rdnfQtx+pmDdlMhp0BTc5EYNf\n\t FJboHwOiMXC33Onbze1GSoNvzLlFPIK9rhRrqSsueRkYACFW51iYCE+t5LiSSUtrDZ\n\t 6Zgo/egoBF46WoaKKLJpL+hNtjheakCbbtpFjT8y7TDrK7Ows6M9EqK3rdErLUzivK\n\t 4Ay85oZFt3iFrC53ukdn7sqXcw6md9eq3jFLK0YjDszHvyQDD9gHGtkAjd47bH+XH1\n\t stGeQfEGcaAiSsSh1IY9gXD9Yt5DxgBQ/zzQ6kcBG30A7WMR3XO465Eebcb6ZNIjyv\n\t BawWjDw+St+Lw==", "From": "\"Barry Song (Xiaomi)\" <baohua@kernel.org>", "To": "akpm@linux-foundation.org,\n\tlinux-mm@kvack.org,\n\twilly@infradead.org", "Cc": "david@kernel.org,\n\tljs@kernel.org,\n\tliam@infradead.org,\n\tvbabka@kernel.org,\n\trppt@kernel.org,\n\tsurenb@google.com,\n\tmhocko@suse.com,\n\tjack@suse.cz,\n\tpfalcato@suse.de,\n\twanglian@kylinos.cn,\n\tchentao@kylinos.cn,\n\tlianux.mm@gmail.com,\n\tkunwu.chan@gmail.com,\n\tliyangouwen1@oppo.com,\n\tchrisl@kernel.org,\n\tkasong@tencent.com,\n\tshikemeng@huaweicloud.com,\n\tnphamcs@gmail.com,\n\tbhe@redhat.com,\n\tyoungjun.park@lge.com,\n\tlinux-arm-kernel@lists.infradead.org,\n\tlinux-kernel@vger.kernel.org,\n\tloongarch@lists.linux.dev,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-riscv@lists.infradead.org,\n\tlinux-s390@vger.kernel.org,\n\t\"Barry Song (Xiaomi)\" <baohua@kernel.org>", "Subject": "[PATCH v2 2/5] mm/swapin: Retry swapin by VMA lock if the lock was\n released for I/O", "Date": "Thu, 30 Apr 2026 12:04:24 +0800", "Message-Id": "<20260430040427.4672-3-baohua@kernel.org>", "X-Mailer": "git-send-email 2.39.3 (Apple Git-146)", "In-Reply-To": "<20260430040427.4672-1-baohua@kernel.org>", "References": "<20260430040427.4672-1-baohua@kernel.org>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "If the current do_swap_page() took the per-VMA lock and we dropped it only\nto wait for I/O completion (e.g., use folio_wait_locked()), then when\ndo_swap_page() is retried after the I/O completes, it should still qualify\nfor the per-VMA-lock path.\n\nTested-by: Wang Lian <wanglian@kylinos.cn>\nTested-by: Kunwu Chan <chentao@kylinos.cn>\nReviewed-by: Wang Lian <lianux.mm@gmail.com>\nReviewed-by: Kunwu Chan <kunwu.chan@gmail.com>\nSigned-off-by: Barry Song (Xiaomi) <baohua@kernel.org>\n---\n mm/memory.c | 10 ++++++++--\n 1 file changed, 8 insertions(+), 2 deletions(-)", "diff": "diff --git a/mm/memory.c b/mm/memory.c\nindex 199214f8de08..00ee1599d637 100644\n--- a/mm/memory.c\n+++ b/mm/memory.c\n@@ -4791,6 +4791,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)\n \tunsigned long page_idx;\n \tunsigned long address;\n \tpte_t *ptep;\n+\tbool retry_by_vma_lock = false;\n \n \tif (!pte_unmap_same(vmf))\n \t\tgoto out;\n@@ -4896,8 +4897,13 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)\n \n \tswapcache = folio;\n \tret |= folio_lock_or_retry(folio, vmf);\n-\tif (ret & VM_FAULT_RETRY)\n+\tif (ret & VM_FAULT_RETRY) {\n+\t\tif (fault_flag_allow_retry_first(vmf->flags) &&\n+\t\t !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT) &&\n+\t\t (vmf->flags & FAULT_FLAG_VMA_LOCK))\n+\t\t\tretry_by_vma_lock = true;\n \t\tgoto out_release;\n+\t}\n \n \tpage = folio_file_page(folio, swp_offset(entry));\n \t/*\n@@ -5182,7 +5188,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)\n \t}\n \tif (si)\n \t\tput_swap_device(si);\n-\treturn ret;\n+\treturn ret | (retry_by_vma_lock ? VM_FAULT_RETRY_VMA : 0);\n }\n \n static bool pte_range_none(pte_t *pte, int nr_pages)\n", "prefixes": [ "v2", "2/5" ] }