From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org, Christian Brauner <brauner@kernel.org>
Subject: [PATCH v2 0/9] Optimize posix_spawn signal setup with clone3
Date: Fri, 30 Sep 2022 16:26:04 -0300 [thread overview]
Message-ID: <20220930192613.3491147-1-adhemerval.zanella@linaro.org> (raw)
Currently posix_spawn has to issue at least NSIG sigaction syscalls
to obtain current signal disposition and more if they there are not
either SIG_IGN or SIG_DFL. The new clone3 CLONE_CLEAR_SIGHAND flags
introduced with Linux 5.5 resets all signal handlers of the child not
set to SIG_IGN to SIG_DFL, thus allowing posix_spawn to skip this
preparation phase.
The exception is the signals defined by posix_spawnattr_setsigdefault
when POSIX_SPAWN_SETSIGDEF is set (since they can be SIG_IGN). In
this case posix_spawn helper process needs to issue a sigction to
set the signal disposition to SIG_DFL.
The patchset also adds clone3 implementation for aarch64, powerpc64,
s390x, riscv, arm, and mips.
Changes from v1:
* Adeed arm and mips clone3 implementation.
Adhemerval Zanella (9):
linux: Do not reset signal handler in posix_spawn 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
arm: Add the clone3 wrapper
mips: Add the clone3 wrapper
Linux: optimize clone3 internal usage
include/clone_internal.h | 10 +
posix/Makefile | 3 +-
posix/tst-spawn7.c | 179 ++++++++++++++++++
sysdeps/unix/sysv/linux/aarch64/clone3.S | 90 +++++++++
sysdeps/unix/sysv/linux/aarch64/sysdep.h | 2 +
sysdeps/unix/sysv/linux/arm/clone3.S | 80 ++++++++
sysdeps/unix/sysv/linux/arm/sysdep.h | 1 +
sysdeps/unix/sysv/linux/clone-internal.c | 59 ++++--
sysdeps/unix/sysv/linux/clone3.h | 6 +
sysdeps/unix/sysv/linux/kernel-features.h | 9 +
sysdeps/unix/sysv/linux/mips/clone3.S | 147 ++++++++++++++
sysdeps/unix/sysv/linux/mips/sysdep.h | 2 +
.../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 +++-
19 files changed, 910 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/arm/clone3.S
create mode 100644 sysdeps/unix/sysv/linux/mips/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:[~2022-09-30 19:26 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-30 19:26 Adhemerval Zanella [this message]
2022-09-30 19:26 ` [PATCH v2 1/9] linux: Do not reset signal handler in posix_spawn if it is already SIG_DFL Adhemerval Zanella
2023-01-11 21:06 ` Carlos O'Donell
2022-09-30 19:26 ` [PATCH v2 2/9] linux: Add clone3 CLONE_CLEAR_SIGHAND optimization to posix_spawn Adhemerval Zanella
2023-01-11 21:06 ` Carlos O'Donell
2022-09-30 19:26 ` [PATCH v2 3/9] powerpc64le: Add the clone3 wrapper Adhemerval Zanella
2022-09-30 19:26 ` [PATCH v2 4/9] aarch64: " Adhemerval Zanella
2022-11-02 12:12 ` Szabolcs Nagy
2022-11-03 13:15 ` Adhemerval Zanella Netto
2022-11-03 14:01 ` Szabolcs Nagy
2022-11-03 16:22 ` Adhemerval Zanella Netto
2022-11-03 16:31 ` Szabolcs Nagy
2022-11-03 16:39 ` Adhemerval Zanella Netto
2022-11-03 16:52 ` Szabolcs Nagy
2022-11-03 16:55 ` Adhemerval Zanella Netto
2022-11-03 20:55 ` H.J. Lu
2022-11-03 21:28 ` Adhemerval Zanella Netto
2022-11-03 21:22 ` Adhemerval Zanella Netto
2022-11-03 21:58 ` H.J. Lu
2022-11-04 12:32 ` Adhemerval Zanella Netto
2022-09-30 19:26 ` [PATCH v2 5/9] s390x: " Adhemerval Zanella
2022-09-30 19:26 ` [PATCH v2 6/9] riscv: " Adhemerval Zanella
2022-09-30 19:26 ` [PATCH v2 7/9] arm: " Adhemerval Zanella
2022-09-30 19:26 ` [PATCH v2 8/9] mips: " Adhemerval Zanella
2022-09-30 19:26 ` [PATCH v2 9/9] Linux: optimize clone3 internal usage Adhemerval Zanella
2023-01-11 21:12 ` Carlos O'Donell
2022-10-27 16:48 ` [PATCH v2 0/9] Optimize posix_spawn signal setup with clone3 Adhemerval Zanella Netto
2023-01-11 21:11 ` Carlos O'Donell
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