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AJvYcCWtoMKh4S0Rz3w9CGd3PKvIWMLJErmRorFdAVyKMVAh9shD3wXlUyu9/A9YGjPgKbDsnWooNWknmhiLWY7Jh8I=@vger.kernel.org X-Gm-Message-State: AOJu0YzuPljpQA2PiLb1R/pc0pJdBWoA7UE5I3MeV5lP1MX0/48Q3Yim ogI58bnaqBbvo8sEqQrpWTNusoJgpGh4V3m02mc6pClXmXcotQfnqGl4lqJqh0EgFndI6pyy6cc 1Za6rZg== X-Google-Smtp-Source: AGHT+IEoRLZr8fswQu/g25yORXPM7roxpFOr4Rm1EYCkeCXzeC1BTvV4Tg3ArHbfD7/3gKCei8+KcI8zLGk= X-Received: from plbkz11.prod.google.com ([2002:a17:902:f9cb:b0:240:3c17:a5de]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:350b:b0:240:5549:7094 with SMTP id d9443c01a7336-242a0ac2da9mr39592665ad.18.1754495948156; Wed, 06 Aug 2025 08:59:08 -0700 (PDT) Date: Wed, 6 Aug 2025 08:59:01 -0700 Precedence: bulk X-Mailing-List: linux-kselftest@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: <20250806155905.824388-1-surenb@google.com> Subject: [PATCH v3 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 v2 [2] - Added Reviewed-by, per Vlastimil Babka - Fixed query_vma_find_by_addr() to handle lock_ctx->mmap_locked case, per Vlastimil Babka [1] https://lore.kernel.org/all/20250704060727.724817-1-surenb@google.com/ [2] https://lore.kernel.org/all/20250804231552.1217132-1-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 | 152 ++++++++++++------ fs/proc/task_nommu.c | 14 +- tools/testing/selftests/proc/proc-maps-race.c | 65 ++++++++ 4 files changed, 184 insertions(+), 62 deletions(-) base-commit: 8e7e0c6d09502e44aa7a8fce0821e042a6ec03d1 -- 2.50.1.565.gc32cd1483b-goog