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* [PATCH v2 0/9] Optimize posix_spawn signal setup with clone3
@ 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
                   ` (10 more replies)
  0 siblings, 11 replies; 28+ messages in thread
From: Adhemerval Zanella @ 2022-09-30 19:26 UTC (permalink / raw)
  To: libc-alpha, Christian Brauner

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


^ permalink raw reply	[flat|nested] 28+ messages in thread

end of thread, other threads:[~2023-01-11 21:15 UTC | newest]

Thread overview: 28+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-09-30 19:26 [PATCH v2 0/9] Optimize posix_spawn signal setup with clone3 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 ` [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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