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Subject[RFC PATCH v7 0/7] Restartable sequences system call
Date
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

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