Hi, This is mostly a re-write of Paul Turner and Andrew Hunter's restartable critical sections (percpu atomics), which brings the following main benefits over Paul Turner's prior version (v2): - The ABI is now architecture-agnostic, and it requires fewer instruction on the user-space fast path, - Ported to ARM 32, in addition to cover x86 32/64. Adding support for new architectures is now trivial, - Progress is ensured by a fall-back to locking (purely userspace) when single-stepped by a debugger. This is v7, as it derives from my prior getcpu cache and thread local ABI patchsets. You will find benchmark results in the changelog of patch 1/7. Feedback is welcome! Thanks, Mathieu Mathieu Desnoyers (7): Restartable sequences system call tracing: instrument restartable sequences Restartable sequences: ARM 32 architecture support Restartable sequences: wire up ARM 32 system call Restartable sequences: x86 32/64 architecture support Restartable sequences: wire up x86 32/64 system call Restartable sequences: self-tests MAINTAINERS | 7 + arch/Kconfig | 7 + arch/arm/Kconfig | 1 + arch/arm/include/uapi/asm/unistd.h | 1 + arch/arm/kernel/calls.S | 1 + arch/arm/kernel/signal.c | 7 + arch/x86/Kconfig | 1 + arch/x86/entry/common.c | 1 + arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + arch/x86/kernel/signal.c | 6 + fs/exec.c | 1 + include/linux/sched.h | 68 ++ include/trace/events/rseq.h | 60 ++ include/uapi/linux/Kbuild | 1 + include/uapi/linux/rseq.h | 85 +++ init/Kconfig | 13 + kernel/Makefile | 1 + kernel/fork.c | 2 + kernel/rseq.c | 243 +++++++ kernel/sched/core.c | 1 + kernel/sys_ni.c | 3 + tools/testing/selftests/rseq/.gitignore | 3 + tools/testing/selftests/rseq/Makefile | 13 + .../testing/selftests/rseq/basic_percpu_ops_test.c | 279 ++++++++ tools/testing/selftests/rseq/basic_test.c | 106 +++ tools/testing/selftests/rseq/param_test.c | 707 +++++++++++++++++++++ tools/testing/selftests/rseq/rseq.c | 200 ++++++ tools/testing/selftests/rseq/rseq.h | 449 +++++++++++++ 29 files changed, 2269 insertions(+) create mode 100644 include/trace/events/rseq.h create mode 100644 include/uapi/linux/rseq.h create mode 100644 kernel/rseq.c create mode 100644 tools/testing/selftests/rseq/.gitignore create mode 100644 tools/testing/selftests/rseq/Makefile create mode 100644 tools/testing/selftests/rseq/basic_percpu_ops_test.c create mode 100644 tools/testing/selftests/rseq/basic_test.c create mode 100644 tools/testing/selftests/rseq/param_test.c create mode 100644 tools/testing/selftests/rseq/rseq.c create mode 100644 tools/testing/selftests/rseq/rseq.h -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
