| From: |
| Greg Kroah-Hartman <gregkh-AT-linuxfoundation.org> |
| To: |
| viro-AT-zeniv.linux.org.uk, mtk.manpages-AT-gmail.com, shuah-AT-kernel.org, linux-api-AT-vger.kernel.org |
| Subject: |
| [PATCH 0/3] readfile(2): a new syscall to make open/read/close faster |
| Date: |
| Sat, 4 Jul 2020 16:02:46 +0200 |
| Message-ID: |
| <20200704140250.423345-1-gregkh@linuxfoundation.org> |
| Cc: |
| linux-fsdevel-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, linux-man-AT-vger.kernel.org, linux-kselftest-AT-vger.kernel.org, Greg Kroah-Hartman <gregkh-AT-linuxfoundation.org> |
| Archive-link: |
| Article |
Here is a tiny new syscall, readfile, that makes it simpler to read
small/medium sized files all in one shot, no need to do open/read/close.
This is especially helpful for tools that poke around in procfs or
sysfs, making a little bit of a less system load than before, especially
as syscall overheads go up over time due to various CPU bugs being
addressed.
There are 4 patches in this series, the first 3 are against the kernel
tree, adding the syscall logic, wiring up the syscall, and adding some
tests for it.
The last patch is agains the man-pages project, adding a tiny man page
to try to describe the new syscall.
Greg Kroah-Hartman (3):
readfile: implement readfile syscall
arch: wire up the readfile syscall
selftests: add readfile(2) selftests
arch/alpha/kernel/syscalls/syscall.tbl | 1 +
arch/arm/tools/syscall.tbl | 1 +
arch/arm64/include/asm/unistd.h | 2 +-
arch/arm64/include/asm/unistd32.h | 2 +
arch/ia64/kernel/syscalls/syscall.tbl | 1 +
arch/m68k/kernel/syscalls/syscall.tbl | 1 +
arch/microblaze/kernel/syscalls/syscall.tbl | 1 +
arch/mips/kernel/syscalls/syscall_n32.tbl | 1 +
arch/mips/kernel/syscalls/syscall_n64.tbl | 1 +
arch/mips/kernel/syscalls/syscall_o32.tbl | 1 +
arch/parisc/kernel/syscalls/syscall.tbl | 1 +
arch/powerpc/kernel/syscalls/syscall.tbl | 1 +
arch/s390/kernel/syscalls/syscall.tbl | 1 +
arch/sh/kernel/syscalls/syscall.tbl | 1 +
arch/sparc/kernel/syscalls/syscall.tbl | 1 +
arch/x86/entry/syscalls/syscall_32.tbl | 1 +
arch/x86/entry/syscalls/syscall_64.tbl | 1 +
arch/xtensa/kernel/syscalls/syscall.tbl | 1 +
fs/open.c | 50 +++
include/linux/syscalls.h | 2 +
include/uapi/asm-generic/unistd.h | 4 +-
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/readfile/.gitignore | 3 +
tools/testing/selftests/readfile/Makefile | 7 +
tools/testing/selftests/readfile/readfile.c | 285 +++++++++++++++++
.../selftests/readfile/readfile_speed.c | 301 ++++++++++++++++++
26 files changed, 671 insertions(+), 2 deletions(-)
create mode 100644 tools/testing/selftests/readfile/.gitignore
create mode 100644 tools/testing/selftests/readfile/Makefile
create mode 100644 tools/testing/selftests/readfile/readfile.c
create mode 100644 tools/testing/selftests/readfile/readfile_speed.c
--
2.27.0
