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Re: [PATCH 1/2] pidmap(2)

From Andrew Morton <akpm@linux-foundation.org>
Newsgroups linux.kernel
Subject Re: [PATCH 1/2] pidmap(2)
Date 2017-09-06 01:00 +0200
Message-ID <umuZ3-IG-3@gated-at.bofh.it> (permalink)
References <umrou-6Vh-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, 5 Sep 2017 22:05:00 +0300 Alexey Dobriyan <adobriyan@gmail.com> wrote:

> Implement system call for bulk retrieveing of pids in binary form.
> 
> Using /proc is slower than necessary: 3 syscalls + another 3 for each thread +
> converting with atoi().
> 
> /proc may be not mounted especially in containers. Natural extension of
> hidepid=2 efforts is to not mount /proc at all.
> 
> It could be used by programs like ps, top or CRIU. Speed increase will
> become more drastic once combined with bulk retrieval of process statistics.

The patches are performance optimizations, but their changelogs contain
no performance measurements!

Demonstration of some compelling real-world performance benefits would
help things along a lot.

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Thread

[PATCH 1/2] pidmap(2) Alexey Dobriyan <adobriyan@gmail.com> - 2017-09-05 21:10 +0200
  Re: [PATCH 1/2] pidmap(2) Andrew Morton <akpm@linux-foundation.org> - 2017-09-06 01:00 +0200
    Re: [PATCH 1/2] pidmap(2) Randy Dunlap <rdunlap@infradead.org> - 2017-09-06 01:10 +0200
      Re: [PATCH 1/2] pidmap(2) Thomas Gleixner <tglx@linutronix.de> - 2017-09-06 10:40 +0200
      Re: [PATCH 1/2] pidmap(2) Alexey Dobriyan <adobriyan@gmail.com> - 2017-09-06 11:10 +0200
        Re: [PATCH 1/2] pidmap(2) Andy Lutomirski <luto@amacapital.net> - 2017-09-07 04:10 +0200
          Re: [PATCH 1/2] pidmap(2) Djalal Harouni <tixxdz@gmail.com> - 2017-09-07 07:10 +0200
            Re: [PATCH 1/2] pidmap(2) Alexey Dobriyan <adobriyan@gmail.com> - 2017-09-07 11:50 +0200
          Re: [PATCH 1/2] pidmap(2) Alexey Dobriyan <adobriyan@gmail.com> - 2017-09-07 11:50 +0200
    Re: [PATCH 1/2] pidmap(2) Alexey Dobriyan <adobriyan@gmail.com> - 2017-09-06 11:00 +0200
  Re: [PATCH 1/2] pidmap(2) "Dmitry V. Levin" <ldv@altlinux.org> - 2017-09-07 12:10 +0200

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