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

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Date:   Thu, 7 Sep 2017 13:08:09 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     akpm@...ux-foundation.org,
        Tatsiana Brouka <Tatsiana_Brouka@...m.com>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Aliaksandr Patseyenak <Aliaksandr_Patseyenak1@...m.com>,
        Andrey Vagin <avagin@...nvz.org>
Subject: Re: [PATCH 1/2] pidmap(2)

On Tue, Sep 05, 2017 at 10:05:00PM +0300, Alexey Dobriyan wrote:
> From: Tatsiana Brouka <Tatsiana_Brouka@...m.com>
> 
> 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.

What could give a noticeable performance gain in a less ridiculous way
is an interface like task_diag, see https://lkml.org/lkml/2016/4/11/924 .


-- 
ldv

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