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From: Paul Turner <pjt@google.com>
Date: Tue, 7 May 2013 04:20:55 -0700
Message-ID: <CAPM31R+x3h0b_r4uFkg_SMnkp0AWA6QRAQuDRducycHnFdG5Xw@mail.gmail.com>
Subject: Re: [PATCH v5 3/7] sched: set initial value of runnable avg for new
 forked task
To: Alex Shi <alex.shi@intel.com>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Borislav Petkov <bp@alien8.de>, Namhyung Kim <namhyung@kernel.org>,
        Mike Galbraith <efault@gmx.de>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Preeti U Murthy <preeti@linux.vnet.ibm.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>,
        Rik van Riel <riel@redhat.com>,
        Michael Wang <wangyun@linux.vnet.ibm.com>
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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@intel.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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