From: Carlos O'Donell via Libc-alpha <libc-alpha@sourceware.org>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>,
libc-alpha@sourceware.org, Szabolcs Nagy <szabolcs.nagy@arm.com>,
"H . J . Lu" <hjl.tools@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Subject: Re: [PATCH v2 00/11] Optimize posix_spawn signal setup with clone3
Date: Wed, 11 Jan 2023 16:24:15 -0500 [thread overview]
Message-ID: <ca77311d-aaea-9be4-f09e-6a5abade2d93@redhat.com> (raw)
In-Reply-To: <20221104190112.2566409-1-adhemerval.zanella@linaro.org>
On 11/4/22 15:01, Adhemerval Zanella via Libc-alpha 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. The clone3 for x86_64 is change to not
> align the stack, since this is not async-signal safe (although current
> calls does mask/unmask).
Same comments here that apply for the original v2.
This is actually v3.
Please post v4 with changes and limit it to x86_64 and aarch64.
If arch maintainers respond with a Reviewed-by: then we can include it into the release.
I don't want to make assembly changes this close to the release.
> * Changes from v1:
> - Extend clone3 documentation.
> - Remove x86_64 stack alignment on clone3 child.
> - Fixed powerpc64 missing initial stack frame.
> - Fixed missing save/restore r7 for arm.
>
> Adhemerval Zanella (11):
> linux: Do not reset signal handler in posix_spawn if it is already
> SIG_DFL
> linux: Extend internal clone3 documentation
> Linux: Do not align the stack for __clone3
> linux: Add clone3 CLONE_CLEAR_SIGHAND optimization to posix_spawn
> powerpc64: 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 | 39 +++-
> posix/Makefile | 3 +-
> posix/tst-spawn7.c | 179 ++++++++++++++++++
> sysdeps/unix/sysv/linux/Makefile | 3 +-
> sysdeps/unix/sysv/linux/aarch64/clone3.S | 85 +++++++++
> 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 | 15 +-
> sysdeps/unix/sysv/linux/kernel-features.h | 9 +
> sysdeps/unix/sysv/linux/mips/clone3.S | 139 ++++++++++++++
> sysdeps/unix/sysv/linux/mips/sysdep.h | 2 +
> .../sysv/linux/powerpc/powerpc64/clone3.S | 152 +++++++++++++++
> sysdeps/unix/sysv/linux/powerpc/sysdep.h | 1 +
> sysdeps/unix/sysv/linux/riscv/clone3.S | 80 ++++++++
> sysdeps/unix/sysv/linux/riscv/sysdep.h | 1 +
> sysdeps/unix/sysv/linux/s390/s390-64/clone3.S | 81 ++++++++
> sysdeps/unix/sysv/linux/s390/sysdep.h | 1 +
> sysdeps/unix/sysv/linux/spawni.c | 33 +++-
> .../sysv/linux/tst-misalign-clone-internal.c | 74 --------
> sysdeps/unix/sysv/linux/x86_64/clone3.S | 3 -
> 22 files changed, 924 insertions(+), 118 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
> delete mode 100644 sysdeps/unix/sysv/linux/tst-misalign-clone-internal.c
>
--
Cheers,
Carlos.
prev parent reply other threads:[~2023-01-11 21:24 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-04 19:01 [PATCH v2 00/11] Optimize posix_spawn signal setup with clone3 Adhemerval Zanella via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 01/11] linux: Do not reset signal handler in posix_spawn if it is already SIG_DFL Adhemerval Zanella via Libc-alpha
2023-01-11 21:27 ` Carlos O'Donell via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 02/11] linux: Extend internal clone3 documentation Adhemerval Zanella via Libc-alpha
2022-11-07 16:40 ` Szabolcs Nagy via Libc-alpha
2023-01-11 21:35 ` Carlos O'Donell via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 03/11] Linux: Do not align the stack for __clone3 Adhemerval Zanella via Libc-alpha
2023-01-11 21:43 ` Carlos O'Donell via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 04/11] linux: Add clone3 CLONE_CLEAR_SIGHAND optimization to posix_spawn Adhemerval Zanella via Libc-alpha
2023-01-11 21:44 ` Carlos O'Donell via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 05/11] powerpc64: Add the clone3 wrapper Adhemerval Zanella via Libc-alpha
2022-11-28 16:38 ` Paul E Murphy via Libc-alpha
2022-11-29 20:43 ` Adhemerval Zanella Netto via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 06/11] aarch64: " Adhemerval Zanella via Libc-alpha
2022-11-07 16:14 ` Szabolcs Nagy via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 07/11] s390x: " Adhemerval Zanella via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 08/11] riscv: " Adhemerval Zanella via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 09/11] arm: " Adhemerval Zanella via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 10/11] mips: " Adhemerval Zanella via Libc-alpha
2022-11-04 19:01 ` [PATCH v2 11/11] Linux: optimize clone3 internal usage Adhemerval Zanella via Libc-alpha
2023-01-11 21:45 ` Carlos O'Donell via Libc-alpha
2023-01-11 21:24 ` Carlos O'Donell via Libc-alpha [this message]
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