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From: Florian Weimer <fweimer@redhat.com>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Cc: Christian Brauner <christian.brauner@ubuntu.com>,
	 libc-alpha@sourceware.org
Subject: Re: [PATCH 4/5] linux: Optimize posix_spawn spurious sigaction calls
Date: Mon, 07 Oct 2019 18:40:00 -0000	[thread overview]
Message-ID: <8736g4flh0.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <63aabf91-610f-27f9-bc22-96edbc1c9f5f@linaro.org> (Adhemerval Zanella's message of "Mon, 7 Oct 2019 15:35:27 -0300")

* Adhemerval Zanella:

> However, glibc supports older kernels as old as v3.2 and it will take
> some years and releases to make v5.3 or new the minimum support kernel.
> And I think it would be nice to have this optimization even for older
> kernels.

But wouldn't it make sense to backport clone3 to these older kernels, so
that further enhancements are possible, in cooperation with the kernel.

I'm all for supporting older kernels, but performance optimizations for
old kernels, merely to work around missing system call/flag support for
things which are straightforward to backport into the kernel seems not
the right priority to me, sorry.

If things can be fixed in the kernel, fix it there.  That applies to
both performance and functionality bugs.

Thanks,
Florian

  reply	other threads:[~2019-10-07 18:40 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-31 18:31 [PATCH v2 1/5] mips: Do not malloc on getdents64 fallback Adhemerval Zanella
2019-07-31 18:31 ` [PATCH v2 2/5] posix: Add posix_spawn_file_actions_closefrom Adhemerval Zanella
2019-08-28 14:09   ` Adhemerval Zanella
2019-08-28 17:22     ` Joseph Myers
2019-08-28 21:03       ` Adhemerval Zanella
2019-07-31 18:31 ` [PATCH v2 5/5] posix: Use posix_spawn for wordexp Adhemerval Zanella
2019-08-28 14:10   ` Adhemerval Zanella
2019-10-07 17:51     ` Adhemerval Zanella
2019-10-07 19:33   ` Florian Weimer
2019-10-07 21:04     ` Carlos O'Donell
2019-10-08  9:58       ` Florian Weimer
2019-10-08 17:41     ` Adhemerval Zanella
2019-10-09  9:11       ` Florian Weimer
2019-10-09 12:18         ` Adhemerval Zanella
2019-07-31 18:31 ` [PATCH 4/5] linux: Optimize posix_spawn spurious sigaction calls Adhemerval Zanella
2019-08-28 14:09   ` Adhemerval Zanella
2019-08-29  8:38   ` Florian Weimer
2019-08-29 11:26     ` Adhemerval Zanella
2019-08-30 10:07       ` Florian Weimer
2019-08-30 13:05         ` Adhemerval Zanella
2019-09-02 13:14           ` Florian Weimer
2019-09-02 19:47             ` Adhemerval Zanella
2019-10-07 17:51               ` Adhemerval Zanella
2019-10-07 18:25                 ` Christian Brauner
2019-10-07 18:32                   ` Florian Weimer
2019-10-07 21:08                     ` Christian Brauner
2019-10-07 18:35                   ` Adhemerval Zanella
2019-10-07 18:40                     ` Florian Weimer [this message]
2019-10-07 19:20                       ` Adhemerval Zanella
2019-10-09  9:37                         ` Florian Weimer
2019-10-09 10:25                           ` Christian Brauner
2019-10-09 12:17                           ` Adhemerval Zanella
2019-10-09 19:16                             ` Florian Weimer
2019-10-07 21:00                     ` Joseph Myers
2019-10-07 18:41                 ` Florian Weimer
2019-07-31 18:31 ` [PATCH v2 3/5] posix: Optimize stack Linux posix_spawn Adhemerval Zanella
2019-08-28 14:09   ` Adhemerval Zanella
2019-10-07 17:50     ` Adhemerval Zanella
2019-08-28 14:09 ` [PATCH v2 1/5] mips: Do not malloc on getdents64 fallback Adhemerval Zanella
2019-08-28 14:35 ` Andreas Schwab
2019-08-28 17:01   ` Adhemerval Zanella
2019-08-28 14:42 ` Florian Weimer
2019-08-28 21:02   ` Adhemerval Zanella
2019-08-28 21:23     ` Florian Weimer
2019-08-29 11:04       ` Adhemerval Zanella
2019-08-30  9:53 ` Florian Weimer
2019-08-30 12:53   ` Adhemerval Zanella
2019-09-02 12:59     ` Florian Weimer
2019-09-02 17:38       ` Adhemerval Zanella
2019-10-07 17:49         ` Adhemerval Zanella
2019-10-07 18:29         ` Florian Weimer
2019-10-08 17:38           ` Adhemerval Zanella
2019-10-08 18:52             ` Florian Weimer
2019-10-08 19:52               ` Adhemerval Zanella
2019-10-08 19:59                 ` Florian Weimer
2019-10-09 13:02                   ` Adhemerval Zanella
2020-11-02 19:51             ` Joseph Myers
2020-11-02 22:10               ` Adhemerval Zanella
2020-11-03 10:27                 ` Florian Weimer

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