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GET /api/patches/2202527/?format=api
{ "id": 2202527, "url": "http://patchwork.ozlabs.org/api/patches/2202527/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260227200848.114019-7-david@kernel.org/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/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/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260227200848.114019-7-david@kernel.org>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260227200848.114019-7-david@kernel.org/", "date": "2026-02-27T20:08:37", "name": "[v1,06/16] mm/oom_kill: factor out zapping of VMA into zap_vma_for_reaping()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4d27c3fc4573b8515b84d646db42ef8245cacc5c", "submitter": { "id": 92023, "url": "http://patchwork.ozlabs.org/api/people/92023/?format=api", "name": "David Hildenbrand (Arm)", "email": "david@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260227200848.114019-7-david@kernel.org/mbox/", "series": [ { "id": 493807, "url": "http://patchwork.ozlabs.org/api/series/493807/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=493807", "date": "2026-02-27T20:08:31", "name": "mm: cleanups around unmapping / zapping", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/493807/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2202527/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2202527/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-17414-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=nfvnOh6G;\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; d=lists.ozlabs.org; s=201707;\n\tt=1772223050; c=relaxed/relaxed;\n\tbh=VzLysLIDiziqT+z+8O0U2+zIe52qtwqEAHv4JAZVhAg=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=bX9EsmFuT5MgAl7toFKIvd6jS675Do7dCdLZzwoxIIHZyltsF7ubawpUZT+fSUohPzGrMO10AE1ueh2Od7TDIlHUvEufD4AvQH1zcvEV6GHBhKHqQ3CmWqom8A6hZRBLMyUGpt7l9V3WLFgA6rLmJM1aOW+WwVac6pBr0jOUBV05XGDRC0e+wCeWDcbcA6t13RdjblUv9ri1ZPzxKca7kwlRy/EOqaE83oozZnQR6DLdqsKWvm4/UyAdrfhXCZ7CWl8Fmlcgwqie5XMuywLwCdw3VziI6BxLNWYi3lE3XbZJico0ALoBrPKp/wQLcuCMZNiwERi14rAyiWy562d7ew==", "ARC-Authentication-Results": "i=1; lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org;\n dkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=nfvnOh6G; dkim-atps=neutral;\n spf=pass (client-ip=2600:3c04:e001:324:0:1991:8:25;\n helo=tor.source.kernel.org; envelope-from=david@kernel.org;\n receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1772223047;\n\tbh=QGXGGpOpfFdi5KYtLppZ0pqbJn7DahplTB4anRf43p0=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=nfvnOh6GFZtYgZiN0uOTy634vV7a2URwKLO9gYY3hSmWrxWYugIhQMwjmKAP0Ou7H\n\t E7yQ2swT+jt/BCllVI65b1rCvucLmydteEcAWJgvmR6s7NVl1dOcUQKed/pO6sinW9\n\t lwoqUdfj2/aHynj1hfJQjMN4BDqIw/yLezbCWepQA0SY428UknnSWvQAdl5uw8Pw0I\n\t ZMvoXeKbY2uAT7ljvl10AXyMqsQZJg6xW3aCfxZ3Rd8l7duGBMlC0mAecn8AsWYubD\n\t FGcjbDKLIzBns5l13QGee7VBjeTjFl4JHAPE0WATVKG/4R/uphdDwPX6uX4D9dFGKx\n\t IeNq3bC5UkO4w==", "From": "\"David Hildenbrand (Arm)\" <david@kernel.org>", "To": "linux-kernel@vger.kernel.org", "Cc": "\"linux-mm @ kvack . org\" <linux-mm@kvack.org>,\n \"David Hildenbrand (Arm)\" <david@kernel.org>,\n Andrew Morton <akpm@linux-foundation.org>,\n Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,\n \"Liam R. Howlett\" <Liam.Howlett@oracle.com>,\n Vlastimil Babka <vbabka@kernel.org>, Mike Rapoport <rppt@kernel.org>,\n Suren Baghdasaryan <surenb@google.com>, Michal Hocko <mhocko@suse.com>,\n Jann Horn <jannh@google.com>, Pedro Falcato <pfalcato@suse.de>,\n David Rientjes <rientjes@google.com>, Shakeel Butt <shakeel.butt@linux.dev>,\n \"Matthew Wilcox (Oracle)\" <willy@infradead.org>,\n Alice Ryhl <aliceryhl@google.com>, Madhavan Srinivasan <maddy@linux.ibm.com>,\n Michael Ellerman <mpe@ellerman.id.au>,\n Christian Borntraeger <borntraeger@linux.ibm.com>,\n Janosch Frank <frankja@linux.ibm.com>,\n Claudio Imbrenda <imbrenda@linux.ibm.com>,\n Alexander Gordeev <agordeev@linux.ibm.com>,\n Gerald Schaefer <gerald.schaefer@linux.ibm.com>,\n Heiko Carstens <hca@linux.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>,\n Jarkko Sakkinen <jarkko@kernel.org>, Thomas Gleixner <tglx@kernel.org>,\n Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,\n Greg Kroah-Hartman <gregkh@linuxfoundation.org>, =?utf-8?q?Arve_Hj=C3=B8nne?=\n\t=?utf-8?q?v=C3=A5g?= <arve@android.com>, Todd Kjos <tkjos@android.com>,\n Christian Brauner <brauner@kernel.org>, Carlos Llamas <cmllamas@google.com>,\n Ian Abbott <abbotti@mev.co.uk>,\n H Hartley Sweeten <hsweeten@visionengravers.com>,\n Jani Nikula <jani.nikula@linux.intel.com>,\n Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,\n Rodrigo Vivi <rodrigo.vivi@intel.com>, Tvrtko Ursulin <tursulin@ursulin.net>,\n David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,\n Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>,\n Dimitri Sivanich <dimitri.sivanich@hpe.com>, Arnd Bergmann <arnd@arndb.de>,\n Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>,\n Andrii Nakryiko <andrii@kernel.org>, Peter Zijlstra <peterz@infradead.org>,\n Arnaldo Carvalho de Melo <acme@kernel.org>,\n Namhyung Kim <namhyung@kernel.org>, Andy Lutomirski <luto@kernel.org>,\n Vincenzo Frascino <vincenzo.frascino@arm.com>,\n Eric Dumazet <edumazet@google.com>, Neal Cardwell <ncardwell@google.com>,\n \"David S. Miller\" <davem@davemloft.net>, David Ahern <dsahern@kernel.org>,\n Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,\n Miguel Ojeda <ojeda@kernel.org>, linuxppc-dev@lists.ozlabs.org,\n kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-sgx@vger.kernel.org,\n intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,\n linux-rdma@vger.kernel.org, bpf@vger.kernel.org,\n linux-perf-users@vger.kernel.org, linux-fsdevel@vger.kernel.org,\n netdev@vger.kernel.org, rust-for-linux@vger.kernel.org, x86@kernel.org", "Subject": "[PATCH v1 06/16] mm/oom_kill: factor out zapping of VMA into\n zap_vma_for_reaping()", "Date": "Fri, 27 Feb 2026 21:08:37 +0100", "Message-ID": "<20260227200848.114019-7-david@kernel.org>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260227200848.114019-1-david@kernel.org>", "References": "<20260227200848.114019-1-david@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": "Let's factor it out so we can turn unmap_page_range() into a static\nfunction instead, and so oom reaping has a clean interface to call.\n\nNote that hugetlb is not supported, because it would require a bunch of\nhugetlb-specific further actions (see zap_page_range_single_batched()).\n\nSigned-off-by: David Hildenbrand (Arm) <david@kernel.org>\n---\n mm/internal.h | 5 +----\n mm/memory.c | 36 ++++++++++++++++++++++++++++++++----\n mm/oom_kill.c | 15 +--------------\n 3 files changed, 34 insertions(+), 22 deletions(-)", "diff": "diff --git a/mm/internal.h b/mm/internal.h\nindex 39ab37bb0e1d..df9190f7db0e 100644\n--- a/mm/internal.h\n+++ b/mm/internal.h\n@@ -536,13 +536,10 @@ static inline void sync_with_folio_pmd_zap(struct mm_struct *mm, pmd_t *pmdp)\n }\n \n struct zap_details;\n-void unmap_page_range(struct mmu_gather *tlb,\n-\t\t\t struct vm_area_struct *vma,\n-\t\t\t unsigned long addr, unsigned long end,\n-\t\t\t struct zap_details *details);\n void zap_page_range_single_batched(struct mmu_gather *tlb,\n \t\tstruct vm_area_struct *vma, unsigned long addr,\n \t\tunsigned long size, struct zap_details *details);\n+int zap_vma_for_reaping(struct vm_area_struct *vma);\n int folio_unmap_invalidate(struct address_space *mapping, struct folio *folio,\n \t\t\t gfp_t gfp);\n \ndiff --git a/mm/memory.c b/mm/memory.c\nindex e4154f03feac..621f38ae1425 100644\n--- a/mm/memory.c\n+++ b/mm/memory.c\n@@ -2054,10 +2054,9 @@ static inline unsigned long zap_p4d_range(struct mmu_gather *tlb,\n \treturn addr;\n }\n \n-void unmap_page_range(struct mmu_gather *tlb,\n-\t\t\t struct vm_area_struct *vma,\n-\t\t\t unsigned long addr, unsigned long end,\n-\t\t\t struct zap_details *details)\n+static void unmap_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma,\n+\t\tunsigned long addr, unsigned long end,\n+\t\tstruct zap_details *details)\n {\n \tpgd_t *pgd;\n \tunsigned long next;\n@@ -2115,6 +2114,35 @@ static void unmap_single_vma(struct mmu_gather *tlb,\n \t}\n }\n \n+/**\n+ * zap_vma_for_reaping - zap all page table entries in the vma without blocking\n+ * @vma: The vma to zap.\n+ *\n+ * Zap all page table entries in the vma without blocking for use by the oom\n+ * killer. Hugetlb vmas are not supported.\n+ *\n+ * Returns: 0 on success, -EBUSY if we would have to block.\n+ */\n+int zap_vma_for_reaping(struct vm_area_struct *vma)\n+{\n+\tstruct mmu_notifier_range range;\n+\tstruct mmu_gather tlb;\n+\n+\tVM_WARN_ON_ONCE(is_vm_hugetlb_page(vma));\n+\n+\tmmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma->vm_mm,\n+\t\t\t\tvma->vm_start, vma->vm_end);\n+\ttlb_gather_mmu(&tlb, vma->vm_mm);\n+\tif (mmu_notifier_invalidate_range_start_nonblock(&range)) {\n+\t\ttlb_finish_mmu(&tlb);\n+\t\treturn -EBUSY;\n+\t}\n+\tunmap_page_range(&tlb, vma, range.start, range.end, NULL);\n+\tmmu_notifier_invalidate_range_end(&range);\n+\ttlb_finish_mmu(&tlb);\n+\treturn 0;\n+}\n+\n /**\n * unmap_vmas - unmap a range of memory covered by a list of vma's\n * @tlb: address of the caller's struct mmu_gather\ndiff --git a/mm/oom_kill.c b/mm/oom_kill.c\nindex 0ba56fcd10d5..54b7a8fe5136 100644\n--- a/mm/oom_kill.c\n+++ b/mm/oom_kill.c\n@@ -548,21 +548,8 @@ static bool __oom_reap_task_mm(struct mm_struct *mm)\n \t\t * count elevated without a good reason.\n \t\t */\n \t\tif (vma_is_anonymous(vma) || !(vma->vm_flags & VM_SHARED)) {\n-\t\t\tstruct mmu_notifier_range range;\n-\t\t\tstruct mmu_gather tlb;\n-\n-\t\t\tmmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0,\n-\t\t\t\t\t\tmm, vma->vm_start,\n-\t\t\t\t\t\tvma->vm_end);\n-\t\t\ttlb_gather_mmu(&tlb, mm);\n-\t\t\tif (mmu_notifier_invalidate_range_start_nonblock(&range)) {\n-\t\t\t\ttlb_finish_mmu(&tlb);\n+\t\t\tif (zap_vma_for_reaping(vma))\n \t\t\t\tret = false;\n-\t\t\t\tcontinue;\n-\t\t\t}\n-\t\t\tunmap_page_range(&tlb, vma, range.start, range.end, NULL);\n-\t\t\tmmu_notifier_invalidate_range_end(&range);\n-\t\t\ttlb_finish_mmu(&tlb);\n \t\t}\n \t}\n \n", "prefixes": [ "v1", "06/16" ] }