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/[email protected]/ 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
