From: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org, Christian Brauner <brauner@kernel.org>
Subject: Re: [PATCH v2 0/9] Optimize posix_spawn signal setup with clone3
Date: Thu, 27 Oct 2022 13:48:35 -0300 [thread overview]
Message-ID: <8f041569-88f1-b223-744d-88ea548a51b5@linaro.org> (raw)
In-Reply-To: <20220930192613.3491147-1-adhemerval.zanella@linaro.org>
Ping.
On 30/09/22 16:26, Adhemerval Zanella wrote:
> 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
>
next prev parent reply other threads:[~2022-10-27 16:48 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-30 19:26 Adhemerval Zanella
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 ` Adhemerval Zanella Netto [this message]
2023-01-11 21:11 ` [PATCH v2 0/9] Optimize posix_spawn signal setup with clone3 Carlos O'Donell
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