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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Alban Crequy , Alban Crequy , Peter Xu , Willy Tarreau , linux-kselftest@vger.kernel.org, shuah@kernel.org Subject: [PATCH v2 0/2] mm/process_vm_access: pidfd and nowait support for process_vm_readv/writev Date: Wed, 8 Apr 2026 16:54:34 +0200 Message-ID: <20260408145436.843538-1-alban.crequy@gmail.com> X-Mailer: git-send-email 2.45.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This adds two flags to process_vm_readv/writev: - PROCESS_VM_PIDFD: refer to the remote process via PID file descriptor instead of PID. - PROCESS_VM_NOWAIT: do not block on IO if the memory access causes a page fault. v1: https://lore.kernel.org/lkml/20251118132348.2415603-1-alban.crequy@gmail.com/ Changes since v1: - Expand commit message with use-case motivation (David Hildenbrand) - Use unsigned long consistently for pvm_flags parameter (David Hildenbrand) - Add PROCESS_VM_SUPPORTED_FLAGS kernel-internal define (David Hildenbrand) - Keep (1UL << N) in UAPI header: BIT() is defined in vdso/bits.h which is not exported to userspace, so UAPI headers using BIT() would break when included from userspace programs (David Hildenbrand) - Add selftests (new patch 2/2) Alban Crequy (2): mm/process_vm_access: pidfd and nowait support for process_vm_readv/writev selftests/mm: add tests for process_vm_readv flags MAINTAINERS | 1 + include/uapi/linux/process_vm.h | 9 + mm/process_vm_access.c | 24 +- tools/testing/selftests/mm/Makefile | 1 + tools/testing/selftests/mm/process_vm_readv.c | 368 ++++++++++++++++++ 5 files changed, 397 insertions(+), 6 deletions(-) create mode 100644 include/uapi/linux/process_vm.h create mode 100644 tools/testing/selftests/mm/process_vm_readv.c -- 2.45.0