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Subject[PATCH v4 0/5] getcpu_cache system call for 4.6
Date
Hi,

Here is a patchset implementing a cache for the CPU number of the
currently running thread in user-space.

Benchmarks comparing this approach to a getcpu based on system call on
ARM show a 44x speedup. They show a 14x speedup on x86-64 compared to
executing lsl from a vDSO through glibc.

I'm added a man page in the changelog of patch 1/3, which shows an
example usage of this new system call.

This series is based on v4.5-rc5, submitted for Linux 4.6.

Feedback is welcome,

Thanks!

Mathieu


Mathieu Desnoyers (5):
getcpu_cache system call: cache CPU number of running thread
getcpu_cache: ARM resume notifier
getcpu_cache: wire up ARM system call
getcpu_cache: x86 32/64 resume notifier
getcpu_cache: wire up x86 32/64 system call

MAINTAINERS | 7 ++
arch/arm/include/uapi/asm/unistd.h | 1 +
arch/arm/kernel/calls.S | 3 +-
arch/arm/kernel/signal.c | 1 +
arch/x86/entry/common.c | 1 +
arch/x86/entry/syscalls/syscall_32.tbl | 1 +
arch/x86/entry/syscalls/syscall_64.tbl | 1 +
fs/exec.c | 1 +
include/linux/sched.h | 36 ++++++++
include/uapi/linux/Kbuild | 1 +
include/uapi/linux/getcpu_cache.h | 42 +++++++++
init/Kconfig | 10 ++
kernel/Makefile | 1 +
kernel/fork.c | 4 +
kernel/getcpu_cache.c | 163 +++++++++++++++++++++++++++++++++
kernel/sched/sched.h | 1 +
kernel/sys_ni.c | 3 +
17 files changed, 276 insertions(+), 1 deletion(-)
create mode 100644 include/uapi/linux/getcpu_cache.h
create mode 100644 kernel/getcpu_cache.c

--
2.1.4

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