[PATCH v5 0/4] vm: add a syscall to map a process memory into a pipe

Mike Rapoport
2018-01-09T06:31:14Z

Hi,

This patches introduces new process_vmsplice system call that combines
functionality of process_vm_read and vmsplice.

It allows to map the memory of another process into a pipe, similarly to
what vmsplice does for its own address space.

The patch 2/4 ("vm: add a syscall to map a process memory into a pipe")
actually adds the new system call and provides its elaborate description.

The patchset is against -mm tree.

v5: update changelog with more elaborate usecase description
v4: skip test when process_vmsplice syscall is not available
v3: minor refactoring to reduce code duplication
v2: move this syscall under CONFIG_CROSS_MEMORY_ATTACH
give correct flags to get_user_pages_remote()

Andrei Vagin (3):
vm: add a syscall to map a process memory into a pipe
x86: wire up the process_vmsplice syscall
test: add a test for the process_vmsplice syscall

Mike Rapoport (1):
fs/splice: introduce pages_to_pipe helper

arch/x86/entry/syscalls/syscall_32.tbl | 1 +
arch/x86/entry/syscalls/syscall_64.tbl | 2 +
fs/splice.c | 262 +++++++++++++++++++--
include/linux/compat.h | 3 +
include/linux/syscalls.h | 4 +
include/uapi/asm-generic/unistd.h | 5 +-
kernel/sys_ni.c | 2 +
tools/testing/selftests/process_vmsplice/Makefile | 5 +
.../process_vmsplice/process_vmsplice_test.c | 196 +++++++++++++++
9 files changed, 458 insertions(+), 22 deletions(-)
create mode 100644 tools/testing/selftests/process_vmsplice/Makefile
create mode 100644 tools/testing/selftests/process_vmsplice/process_vmsplice_test.c

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2.7.4