linux-kernel - Re: RFC: documentation of the autogroup feature [v2]

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Date:   Fri, 25 Nov 2016 14:04:12 +0100
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:     Afzal Mohammed <afzal.mohd.ma@...il.com>
Cc:     mtk.manpages@...il.com, Mike Galbraith <efault@....de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        linux-man <linux-man@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RFC: documentation of the autogroup feature [v2]

On 11/25/2016 01:52 PM, Afzal Mohammed wrote:
> Hi,
> 
> On Thu, Nov 24, 2016 at 10:41:29PM +0100, Michael Kerrisk (man-pages) wrote:
> 
>>        Suppose  that  there  are two autogroups competing for the same
>>        CPU.  The first group contains ten CPU-bound processes  from  a
>>        kernel build started with make -j10.  The other contains a sin‐
>>        gle CPU-bound process: a video player.   The  effect  of  auto‐
>>        grouping  is  that the two groups will each receive half of the
>>        CPU cycles.  That is, the video player will receive 50% of  the
>>        CPU  cycles,  rather  just 9% of the cycles, which would likely
>                             ^^^^
>                             than ?
> 
> Regards
> afzal

Thanks, Afzal. Fixed!

Cheers,

Michael

> 
>>        lead to degraded video playback.  Or to put things another way:
>>        an  autogroup  that  contains  a large number of CPU-bound pro‐
>>        cesses does not end up overwhelming the CPU at the  expense  of
>>        the other jobs on the system.
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/