From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org,
Christian Brauner <christian.brauner@ubuntu.com>
Subject: [PATCH 0/7] Optimize posix_spawn signal setup with clone3
Date: Wed, 28 Sep 2022 17:46:27 -0300 [thread overview]
Message-ID: <20220928204634.3036650-1-adhemerval.zanella@linaro.org> (raw)
Currently posix_spawn has to issue at least NSIG sigaction syscalls
to obtain current signal disposition and more if there are not
either SIG_IGN or SIG_DFL. The clone3 CLONE_CLEAR_SIGHAND reset
all signal handlers of the child not set to SIG_IGN to SIG_DFL, thus
allowing to skip the preparation phase.
The exception is the signals defined by posix_spawnattr_setsigdefault
when POSIX_SPAWN_SETSIGDEF is set, since they can be SIG_IGN.
The patchset also adds clone3 implementation for aarch64, powerpc64,
s390x, and riscv.
Adhemerval Zanella (7):
linux: Do set signal handler if it is already SIG_DFL
linux: Add clone3 CLONE_CLEAR_SIGHAND optimization to posix_spawn
powerpc64le: Add the clone3 wrapper
aarch64: Add the clone3 wrapper
s390x: Add the clone3 wrapper
riscv: Add the clone3 wrapper
Linux: optimize clone3 internal usage
include/clone_internal.h | 10 +
posix/Makefile | 3 +-
posix/tst-spawn7.c | 177 ++++++++++++++++++
sysdeps/unix/sysv/linux/aarch64/clone3.S | 90 +++++++++
sysdeps/unix/sysv/linux/aarch64/sysdep.h | 2 +
sysdeps/unix/sysv/linux/clone-internal.c | 61 ++++--
sysdeps/unix/sysv/linux/clone3.h | 6 +
sysdeps/unix/sysv/linux/kernel-features.h | 8 +
.../sysv/linux/powerpc/powerpc64/clone3.S | 145 ++++++++++++++
sysdeps/unix/sysv/linux/powerpc/sysdep.h | 1 +
sysdeps/unix/sysv/linux/riscv/clone3.S | 83 ++++++++
sysdeps/unix/sysv/linux/riscv/sysdep.h | 1 +
sysdeps/unix/sysv/linux/s390/s390-64/clone3.S | 84 +++++++++
sysdeps/unix/sysv/linux/s390/sysdep.h | 1 +
sysdeps/unix/sysv/linux/spawni.c | 33 +++-
15 files changed, 679 insertions(+), 26 deletions(-)
create mode 100644 posix/tst-spawn7.c
create mode 100644 sysdeps/unix/sysv/linux/aarch64/clone3.S
create mode 100644 sysdeps/unix/sysv/linux/powerpc/powerpc64/clone3.S
create mode 100644 sysdeps/unix/sysv/linux/riscv/clone3.S
create mode 100644 sysdeps/unix/sysv/linux/s390/s390-64/clone3.S
--
2.34.1
next reply other threads:[~2022-09-28 20:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-28 20:46 Adhemerval Zanella [this message]
2022-09-28 20:46 ` [PATCH 1/7] linux: Do set signal handler if it is already SIG_DFL Adhemerval Zanella
2022-09-28 20:46 ` [PATCH 2/7] linux: Add clone3 CLONE_CLEAR_SIGHAND optimization to posix_spawn Adhemerval Zanella
2022-09-28 20:46 ` [PATCH 3/7] powerpc64le: Add the clone3 wrapper Adhemerval Zanella
2022-09-28 20:46 ` [PATCH 4/7] aarch64: " Adhemerval Zanella
2022-09-28 20:46 ` [PATCH 5/7] s390x: " Adhemerval Zanella
2022-09-28 20:46 ` [PATCH 6/7] riscv: " Adhemerval Zanella
2022-09-28 20:46 ` [PATCH 7/7] Linux: optimize clone3 internal usage Adhemerval Zanella
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