linux-kernel - Re: [PATCH v2 0/2] Replace PID bitmap allocation with IDR API

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Date:   Thu, 28 Sep 2017 15:46:53 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Gargi Sharma <gs051095@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linux-kernel@...r.kernel.org, Julia Lawall <julia.lawall@...6.fr>,
        akpm@...ux-foundation.org, mingo@...nel.org,
        pasha.tatashin@...cle.com, ktkhai@...tuozzo.com,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v2 0/2] Replace PID bitmap allocation with IDR API

On Fri, 2017-09-29 at 01:09 +0530, Gargi Sharma wrote:

> 1000 processes that just sleep and sit around without doing
> anything(100 second sleep and then exit).
> 
> pstree with 10,000 processes
> real    0m0.859s
> user    0m0.536s
> sys    0m0.172s
> 
> ps with 10,000 processes
> real    0m0.918s
> user    0m0.100s
> sys    0m0.172s
> 
> Stats for calling readdir on /proc with 10,000 processes
> real    0m0.092s
> user    0m0.000s
> sys    0m0.020s

Is that with or without your patches?

How does it compare to a kernel with(out) your patches?

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