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

[Dmitry V. Levin]

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


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