linux-kernel - Re: [PATCH 1/2] pidmap(2)

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Message-ID: <alpine.DEB.2.20.1709061029270.1843@nanos>
Date:   Wed, 6 Sep 2017 10:30:04 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Randy Dunlap <rdunlap@...radead.org>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Tatsiana Brouka <Tatsiana_Brouka@...m.com>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Aliaksandr Patseyenak <Aliaksandr_Patseyenak1@...m.com>
Subject: Re: [PATCH 1/2] pidmap(2)

On Tue, 5 Sep 2017, Randy Dunlap wrote:
> On 09/05/17 15:53, Andrew Morton wrote:
> > On Tue, 5 Sep 2017 22:05:00 +0300 Alexey Dobriyan <adobriyan@...il.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.
> > 
> 
> also, I expect that the tiny kernel people will want kconfig options for
> these syscalls.

And of course that stuff wants the corresponding man pages written up.

Thanks,

	tglx