linux-kernel - Re: [PATCH v5 3/7] sched: set initial value of runnable avg for new forked task

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Message-ID: <CAPM31R+x3h0b_r4uFkg_SMnkp0AWA6QRAQuDRducycHnFdG5Xw@mail.gmail.com>
Date:	Tue, 7 May 2013 04:20:55 -0700
From:	Paul Turner <pjt@...gle.com>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Morten Rasmussen <morten.rasmussen@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Michael Wang <wangyun@...ux.vnet.ibm.com>
Subject: Re: [PATCH v5 3/7] sched: set initial value of runnable avg for new
 forked task

Yes, 1024 was only intended as a starting point.  We could also
arbitrarily pick something larger, the key is that we pick
_something_.

If we wanted to be more exacting about it we could just give them a
sched_slice() worth; this would have a few obvious "nice" properties
(pun intended).

On Tue, May 7, 2013 at 4:05 AM, Alex Shi <alex.shi@...el.com> wrote:
> On 05/07/2013 05:57 PM, Morten Rasmussen wrote:
>> Agree. The tracked load of new tasks is often very unstable during first
>> couple of ms on loaded systems. I'm not sure if 1024 is the right
>> initial value. It may need to be larger.
>
> Maybe Peter can give a better value according to the experience on
> scheduler. :)
>
> --
> Thanks
>     Alex
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