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

From	Rik van Riel <riel@surriel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 0/2] Replace PID bitmap allocation with IDR API
Date	2017-09-29 02:40 +0200
Message-ID	<uuRvs-7tU-15@gated-at.bofh.it> (permalink)
References	<uucLD-6o3-3@gated-at.bofh.it> <uuoa5-60L-5@gated-at.bofh.it> <uuMYN-4HS-7@gated-at.bofh.it> <uuMYN-4HS-5@gated-at.bofh.it> <uuNia-536-11@gated-at.bofh.it>
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On Fri, 2017-09-29 at 01:35 +0530, Gargi Sharma wrote:
> On Thu, Sep 28, 2017 at 3:46 PM, Rik van Riel <riel@surriel.com>
> wrote:
> > 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).
> > 
> > Is that with or without your patches?
> > 
> > How does it compare to a kernel with(out) your patches?
> 
> Ah thanks for pointing this out. Those were without the patches.
> Here are the stats for easier comparison.
> 
> With Patches                 Without patches
> pstree
> real    0m0.542s            real    0m0.859s
> user    0m0.335s           user    0m0.536s
> sys    0m0.150s             sys    0m0.172s
> 
> ps
> real    0m0.722s            real    0m0.918s
> user    0m0.064s           user    0m0.100s
> sys    0m0.162s             sys    0m0.172s
> 
> readdir
> real    0m0.080s           real    0m0.092s
> user    0m0.000s          user    0m0.000s
> sys    0m0.021s            sys    0m0.020s

So your patches speed up the use of /proc?

I suspect pstree and ps benefit from the simplification
and speedup of find_pid_ns, which is called from
find_task_by_pid_ns.

That is great news.

-- 
All Rights Reversed.

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[PATCH v2 0/2] Replace PID bitmap allocation with IDR API Gargi Sharma <gs051095@gmail.com> - 2017-09-27 07:10 +0200
  [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR API Gargi Sharma <gs051095@gmail.com> - 2017-09-27 07:10 +0200
    Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR  API Rik van Riel <riel@surriel.com> - 2017-09-27 15:20 +0200
      Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR  API Oleg Nesterov <oleg@redhat.com> - 2017-09-27 16:10 +0200
        Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR API Gargi Sharma <gs051095@gmail.com> - 2017-09-27 17:10 +0200
          Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR  API Oleg Nesterov <oleg@redhat.com> - 2017-09-27 17:20 +0200
      Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR API Gargi Sharma <gs051095@gmail.com> - 2017-09-27 17:10 +0200
    Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR  API Oleg Nesterov <oleg@redhat.com> - 2017-09-27 17:10 +0200
    Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR  API Christoph Hellwig <hch@infradead.org> - 2017-10-01 11:20 +0200
      Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR API Gargi Sharma <gs051095@gmail.com> - 2017-10-01 12:40 +0200
        Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR  API Rik van Riel <riel@surriel.com> - 2017-10-02 15:20 +0200
      Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR  API Rik van Riel <riel@surriel.com> - 2017-10-02 15:10 +0200
  [PATCH v2 2/2] pid: Remove pidhash Gargi Sharma <gs051095@gmail.com> - 2017-09-27 07:10 +0200
    Re: [PATCH v2 2/2] pid: Remove pidhash Oleg Nesterov <oleg@redhat.com> - 2017-09-27 17:50 +0200
      Re: [PATCH v2 2/2] pid: Remove pidhash Oleg Nesterov <oleg@redhat.com> - 2017-09-27 18:30 +0200
        Re: [PATCH v2 2/2] pid: Remove pidhash Gargi Sharma <gs051095@gmail.com> - 2017-09-30 17:50 +0200
      Re: [PATCH v2 2/2] pid: Remove pidhash Rik van Riel <riel@surriel.com> - 2017-10-02 22:50 +0200
        Re: [PATCH v2 2/2] pid: Remove pidhash Gargi Sharma <gs051095@gmail.com> - 2017-10-02 22:50 +0200
      Re: [PATCH v2 2/2] pid: Remove pidhash Oleg Nesterov <oleg@redhat.com> - 2017-10-02 22:50 +0200
      Re: [PATCH v2 2/2] pid: Remove pidhash Rik van Riel <riel@surriel.com> - 2017-10-02 22:50 +0200
  Re: [PATCH v2 0/2] Replace PID bitmap allocation with IDR API ebiederm@xmission.com (Eric W. Biederman) - 2017-09-27 19:20 +0200
    Re: [PATCH v2 0/2] Replace PID bitmap allocation with IDR API Rik van Riel <riel@surriel.com> - 2017-09-28 21:50 +0200
      Re: [PATCH v2 0/2] Replace PID bitmap allocation with IDR API Gargi Sharma <gs051095@gmail.com> - 2017-09-28 22:10 +0200
        Re: [PATCH v2 0/2] Replace PID bitmap allocation with IDR API Rik van Riel <riel@surriel.com> - 2017-09-29 02:40 +0200

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