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AJvYcCWvN23igcf78ySurRkv+RDdlYi9WDffPj0r0YKrNeWZgkM8SEVQybepE1mpXhL4vOb26lD5FNjFKs0oYWqI@vger.kernel.org X-Gm-Message-State: AOJu0Yxiq7+66rx+QrJ9SrP3OOXd2Jyj4vHwdDmF6j+ajJ9vLbPqqfPZ o1NFHDeqNY3RwzNL8TnxdZEYneGRCC1hVcSl33SVcJuJjqt/vyMaPOfGygxFL7GDC04iy4IacX0 EGvtn1A== X-Google-Smtp-Source: AGHT+IG2q4Q/icGmfZqa/AQL4Y/7ixWiXboOhyChxpBm5zefJHZYEBLAPMKg6t2vVqdvtV/Sahk/uwOkeqs= X-Received: from pgan189.prod.google.com ([2002:a63:40c6:0:b0:b42:da4:ef4]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:9994:b0:23f:fd87:424b with SMTP id adf61e73a8af0-23ffd874f47mr10654460637.44.1754349355847; Mon, 04 Aug 2025 16:15:55 -0700 (PDT) Date: Mon, 4 Aug 2025 16:15:48 -0700 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.50.1.565.gc32cd1483b-goog Message-ID: <20250804231552.1217132-1-surenb@google.com> Subject: [PATCH v2 0/3] execute PROCMAP_QUERY ioctl under per-vma lock From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, david@redhat.com, vbabka@suse.cz, peterx@redhat.com, jannh@google.com, hannes@cmpxchg.org, mhocko@kernel.org, paulmck@kernel.org, shuah@kernel.org, adobriyan@gmail.com, brauner@kernel.org, josef@toxicpanda.com, yebin10@huawei.com, linux@weissschuh.net, willy@infradead.org, osalvador@suse.de, andrii@kernel.org, ryan.roberts@arm.com, christophe.leroy@csgroup.eu, tjmercier@google.com, kaleshsingh@google.com, aha310510@gmail.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, surenb@google.com Content-Type: text/plain; charset="UTF-8" With /proc/pid/maps now being read under per-vma lock protection we can reuse parts of that code to execute PROCMAP_QUERY ioctl also without taking mmap_lock. The change is designed to reduce mmap_lock contention and prevent PROCMAP_QUERY ioctl calls from blocking address space updates. This patchset was split out of the original patchset [1] that introduced per-vma lock usage for /proc/pid/maps reading. It contains PROCMAP_QUERY tests, code refactoring patch to simplify the main change and the actual transition to per-vma lock. Changes since v1 [2] - Added Tested-by and Acked-by, per SeongJae Park - Fixed NOMMU case, per Vlastimil Babka - Renamed proc_maps_query_data to proc_maps_locking_ctx, per Vlastimil Babka [1] https://lore.kernel.org/all/20250704060727.724817-1-surenb@google.com/ [2] https://lore.kernel.org/all/20250731220024.702621-1-surenb@google.com/ Suren Baghdasaryan (3): selftests/proc: test PROCMAP_QUERY ioctl while vma is concurrently modified fs/proc/task_mmu: factor out proc_maps_private fields used by PROCMAP_QUERY fs/proc/task_mmu: execute PROCMAP_QUERY ioctl under per-vma locks fs/proc/internal.h | 15 +- fs/proc/task_mmu.c | 149 ++++++++++++------ fs/proc/task_nommu.c | 14 +- tools/testing/selftests/proc/proc-maps-race.c | 65 ++++++++ 4 files changed, 181 insertions(+), 62 deletions(-) base-commit: 01da54f10fddf3b01c5a3b80f6b16bbad390c302 -- 2.50.1.565.gc32cd1483b-goog