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{ "id": 2197307, "url": "http://patchwork.ozlabs.org/api/1.0/covers/2197307/?format=api", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.0/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": "<20260217163250.2326001-1-surenb@google.com>", "date": "2026-02-17T16:32:47", "name": "[v2,0/3] Use killable vma write locking in most places", "submitter": { "id": 74729, "url": "http://patchwork.ozlabs.org/api/1.0/people/74729/?format=api", "name": "Suren Baghdasaryan", "email": "surenb@google.com" }, "series": [ { "id": 492454, "url": "http://patchwork.ozlabs.org/api/1.0/series/492454/?format=api", "date": "2026-02-17T16:32:47", "name": "Use killable vma write locking in most places", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/492454/mbox/" } ], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-16906-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=google.com header.i=@google.com header.a=rsa-sha256\n header.s=20230601 header.b=ySW8VjNi;\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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Tue, 17\n Feb 2026 08:32:53 -0800 (PST)", "Date": "Tue, 17 Feb 2026 08:32:47 -0800", "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", "X-Mailer": "git-send-email 2.53.0.273.g2a3d683680-goog", "Message-ID": "<20260217163250.2326001-1-surenb@google.com>", "Subject": "[PATCH v2 0/3] Use killable vma write locking in most places", "From": "Suren Baghdasaryan <surenb@google.com>", "To": "akpm@linux-foundation.org", "Cc": "willy@infradead.org, david@kernel.org, ziy@nvidia.com,\n\tmatthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com,\n\tbyungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com,\n\tapopple@nvidia.com, lorenzo.stoakes@oracle.com,\n baolin.wang@linux.alibaba.com,\n\tLiam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com,\n\tdev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, vbabka@suse.cz,\n\tjannh@google.com, rppt@kernel.org, mhocko@suse.com, pfalcato@suse.de,\n\tkees@kernel.org, maddy@linux.ibm.com, npiggin@gmail.com, mpe@ellerman.id.au,\n\tchleroy@kernel.org, borntraeger@linux.ibm.com, frankja@linux.ibm.com,\n\timbrenda@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com,\n\tagordeev@linux.ibm.com, svens@linux.ibm.com, gerald.schaefer@linux.ibm.com,\n\tlinux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, surenb@google.com", "Content-Type": "text/plain; charset=\"UTF-8\"", "X-Spam-Status": "No, score=-7.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,\n\tUSER_IN_DEF_DKIM_WL autolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "Now that we have vma_start_write_killable() we can replace most of the\nvma_start_write() calls with it, improving reaction time to the kill\nsignal.\n\nThere are several places which are left untouched by this patchset:\n\n1. free_pgtables() because function should free page tables even if a\nfatal signal is pending.\n\n2. userfaultd code, where some paths calling vma_start_write() can\nhandle EINTR and some can't without a deeper code refactoring.\n\n3. vm_flags_{set|mod|clear} require refactoring that involves moving\nvma_start_write() out of these functions and replacing it with\nvma_assert_write_locked(), then callers of these functions should\nlock the vma themselves using vma_start_write_killable() whenever\npossible.\n\nA cleanup patch is added in the beginning to make later changes more\nreadable. The second patch contains most of the changes and the last\npatch contains the changes associated with process_vma_walk_lock()\nerror handling.\n\nChanges since v1 [1]:\n- Moved vma_start_write_killable() inside set_mempolicy_home_node()\nto be done before mpol_dup(new), per Jann Horn\n- Added error propagation for the missing PGWALK_WRLOCK users and\nsplit it into a separate patch, per Jann Horn\n- Moved vma_start_write_killable() inside __split_vma() to be done\nbefore new->vm_ops->open(), per Jann Horn\n- Added a separate patch to change flow control in vma_expand(),\nper Jann Horn\n- Brought back signal_pending() in mm_take_all_locks, per Jann Horn\n- Moved vma_start_write_killable() inside __mmap_new_vma() to be done\nbefore __mmap_new_file_vma(), per Jann Horn\n- Added Reviewed-by for powerpc, per Ritesh Harjani\n- Added s390 reviewers and the list due to changes in the last patch\n\n[1] https://lore.kernel.org/all/20260209220849.2126486-1-surenb@google.com/\n\nSuren Baghdasaryan (3):\n mm/vma: cleanup error handling path in vma_expand()\n mm: replace vma_start_write() with vma_start_write_killable()\n mm: use vma_start_write_killable() in process_vma_walk_lock()\n\n arch/powerpc/kvm/book3s_hv_uvmem.c | 5 +-\n arch/s390/kvm/kvm-s390.c | 5 +-\n arch/s390/mm/gmap.c | 13 +++-\n fs/proc/task_mmu.c | 7 +-\n include/linux/mempolicy.h | 5 +-\n mm/khugepaged.c | 5 +-\n mm/madvise.c | 4 +-\n mm/memory.c | 2 +\n mm/mempolicy.c | 23 +++++--\n mm/mlock.c | 20 ++++--\n mm/mprotect.c | 4 +-\n mm/mremap.c | 4 +-\n mm/pagewalk.c | 20 ++++--\n mm/vma.c | 105 ++++++++++++++++++++---------\n mm/vma_exec.c | 6 +-\n 15 files changed, 164 insertions(+), 64 deletions(-)\n\n\nbase-commit: b08472d036a36893ecf68296d87beb58d21f4357" }