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GET /api/1.1/patches/2230787/?format=api
{ "id": 2230787, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230787/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260430040427.4672-6-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": "<20260430040427.4672-6-baohua@kernel.org>", "date": "2026-04-30T04:04:27", "name": "[v2,5/5] mm/filemap: Avoid retrying page faults on uptodate folios in filemap faults", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "6ef5172c9d44c8efcbb9fdb6a57172b799cdccaa", "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/20260430040427.4672-6-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/2230787/comments/", "check": "success", "checks": "http://patchwork.ozlabs.org/api/patches/2230787/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20326-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=ocBfK8O4;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Thu, 30 Apr 2026 14:17:30 +1000 (AEST)", "from boromir.ozlabs.org (localhost [127.0.0.1])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 4g5gqs2Dhhz2xPL;\n\tThu, 30 Apr 2026 14:17:29 +1000 (AEST)", "from sea.source.kernel.org (sea.source.kernel.org\n [IPv6:2600:3c0a:e001:78e:0:1991:8:25])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 4g5gYs4hnSz2xMY\n\tfor <linuxppc-dev@lists.ozlabs.org>; Thu, 30 Apr 2026 14:05:21 +1000 (AEST)", "from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58])\n\tby sea.source.kernel.org (Postfix) with ESMTP id D4925435B9;\n\tThu, 30 Apr 2026 04:05:19 +0000 (UTC)", "by smtp.kernel.org (Postfix) with ESMTPSA id DC6E6C2BCB8;\n\tThu, 30 Apr 2026 04:05:14 +0000 (UTC)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1777521922;\n\tcv=none;\n b=na2Zlxuhe5SsTCMOHO0VUS+OIt4d2ibcOj3RsYjCuJxNixqS046q1EZy/kDcWTaIR2DKbmIIbQO64MbvyH+JdKAtCABTdf7xIFQb6Hr5x5RAt6kJshjD/zIK3N4Oklbw49ujEREC1cnDobUf+XMdSWPniRUfWq4Hp0xZcupuv3tGTAVENDWvqbzsTuGJw/DQUs2l798vSuNQxDcYFhvgkATQKOq2B24xJelAbtazA4Ep8k+i8ibs8dO7ebo+1fLrxFD145eP7dmyLLbPe5ziyL7f7DWURfDpn6cEQTzWmXHNv91anviEK/YBDYOwtk6m+Z99UJ41S5kwIgMHfMPqMA==", "ARC-Message-Signature": "i=1; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1777521919;\n\tbh=pbXcAk16+rZv3mixELQ0Ipha1GpoRaVFtegxsWu8Zqk=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=ocBfK8O4Ywas1DnfVulkPf8JAygFLLLSXfSSIhFab5aPydgPGyQRMZl4VC0fcDxzh\n\t ZSF8ZjBo9bGMKXhwl/M9RckUdNTcuoEDs1sQYC8HxwbacO47214ueIB5PuN5R9qPyl\n\t 7/vXQCjK6DhEeLKCFGPA8mBl5pi8Xir7/uhc151Nze4/YpDG2oez+rIhbMYqevbaCB\n\t eLjkznrbZrf9uMIIMqF0/apYtZGMqURcRmb3l4AFBitMcYEDgyMeHrj8n9yVB0vf4O\n\t no7KHvYOh/5gIxhaiyHe3dpMaQbh59rmzxY6J3CuNafpQ/IRafc5BIkfCVPTmXqOYt\n\t bTDK/08BVuABA==", "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 5/5] mm/filemap: Avoid retrying page faults on uptodate\n folios in filemap faults", "Date": "Thu, 30 Apr 2026 12:04:27 +0800", "Message-Id": "<20260430040427.4672-6-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": "For uptodate folios, we are not waiting on I/O. We should\nbe able to acquire the folio lock shortly, so there is no\nneed to drop per-vma locks and perform a full PF retry.\n\nSigned-off-by: Barry Song (Xiaomi) <baohua@kernel.org>\n---\n mm/filemap.c | 7 +++++++\n 1 file changed, 7 insertions(+)", "diff": "diff --git a/mm/filemap.c b/mm/filemap.c\nindex b532d6cbafc8..0d2f6af5d0fe 100644\n--- a/mm/filemap.c\n+++ b/mm/filemap.c\n@@ -3533,6 +3533,13 @@ vm_fault_t filemap_fault(struct vm_fault *vmf)\n \t\t}\n \t}\n \n+\t/*\n+\t * If the folio is uptodate, we are likely only waiting for\n+\t * another concurrent PTE mapping to complete, which should\n+\t * be brief. No need to drop the lock and retry the fault.\n+\t */\n+\tif (folio_test_uptodate(folio))\n+\t\tvmf->flags &= ~FAULT_FLAG_ALLOW_RETRY;\n \tif (!lock_folio_maybe_drop_mmap(vmf, folio, &fpin))\n \t\tgoto out_retry;\n \n", "prefixes": [ "v2", "5/5" ] }