From: Yuyang Du <yuyang.du@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
"mingo@redhat.com" <mingo@redhat.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Paul Turner <pjt@google.com>,
Benjamin Segall <bsegall@google.com>,
arjan.van.de.ven@intel.com, Len Brown <len.brown@intel.com>,
rafael.j.wysocki@intel.com, alan.cox@intel.com, "Gross,
Mark" <mark.gross@intel.com>,
"fengguang.wu@intel.com" <fengguang.wu@intel.com>
Subject: Re: [PATCH 2/2 v4] sched: Rewrite per entity runnable load average tracking
Date: Wed, 30 Jul 2014 08:40:07 +0800 [thread overview]
Message-ID: <20140730004007.GC28673@intel.com> (raw)
In-Reply-To: <20140730083008.GD19379@twins.programming.kicks-ass.net>
On Wed, Jul 30, 2014 at 10:30:08AM +0200, Peter Zijlstra wrote:
> >
> > Isn't the entire effort starting from PJT and Ben up to now to soften the extremely
> > dynamic changes (runnable or not, weight change, etc)? Assume task does not change
> > weight much, but group entity does as Peter mentioned.
>
> No, softening isn't the point at all. But an integrator is the only
> means of predicting the future given the erratic past.
>
> The whole point we got into this game is to better compute per cpu group
> weights, not to soften stuff, that's just a necessarily evil to more
> accurately predict erratic/unknown behaviour.
>
>
Yes, I totally agree. I think what I meant by "soften" is the *effect* of the integrator
that takes/averages the infinite history to predict the tufure.
next prev parent reply other threads:[~2014-07-30 8:42 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-17 23:26 [PATCH 0/2 v4] sched: Rewrite per entity runnable load average tracking Yuyang Du
2014-07-17 23:26 ` [PATCH 1/2 v4] sched: Remove update_rq_runnable_avg Yuyang Du
2014-07-17 23:26 ` [PATCH 2/2 v4] sched: Rewrite per entity runnable load average tracking Yuyang Du
2014-07-18 9:43 ` Vincent Guittot
2014-07-27 17:36 ` Yuyang Du
2014-07-29 9:12 ` Vincent Guittot
2014-07-29 1:43 ` Yuyang Du
2014-07-29 13:17 ` Vincent Guittot
2014-07-29 22:27 ` Yuyang Du
2014-07-30 8:30 ` Peter Zijlstra
2014-07-30 0:40 ` Yuyang Du [this message]
2014-07-29 9:39 ` Peter Zijlstra
2014-07-29 1:53 ` Yuyang Du
2014-07-29 13:35 ` Peter Zijlstra
2014-07-29 15:55 ` Peter Zijlstra
2014-07-29 23:08 ` Yuyang Du
2014-07-31 9:40 ` Vincent Guittot
2014-07-31 9:56 ` [PATCH 2/2 v4] sched: Rewrite per entity runnable load average Vincent Guittot
2014-07-31 19:16 ` Yuyang Du
2014-08-01 9:28 ` Vincent Guittot
2014-07-28 10:48 ` [PATCH 2/2 v4] sched: Rewrite per entity runnable load average tracking Peter Zijlstra
2014-07-29 0:56 ` Yuyang Du
2014-07-29 13:15 ` Peter Zijlstra
2014-07-28 11:39 ` Peter Zijlstra
2014-07-29 1:09 ` Yuyang Du
2014-07-29 13:19 ` Peter Zijlstra
2014-07-28 12:01 ` Peter Zijlstra
2014-07-28 13:51 ` Peter Zijlstra
2014-07-28 16:58 ` bsegall
2014-07-28 17:19 ` Peter Zijlstra
2014-07-29 1:13 ` Yuyang Du
2014-07-18 15:39 ` [PATCH 0/2 " Morten Rasmussen
2014-07-27 19:02 ` Yuyang Du
2014-07-28 10:38 ` Peter Zijlstra
2014-07-29 1:17 ` Yuyang Du
2014-07-29 13:06 ` Peter Zijlstra
2014-07-30 10:13 ` Morten Rasmussen
2014-07-30 10:21 ` Peter Zijlstra
2014-07-30 10:57 ` Morten Rasmussen
2014-07-30 19:17 ` Yuyang Du
2014-07-31 8:54 ` Morten Rasmussen
2014-07-31 2:15 ` Yuyang Du
2014-07-20 5:46 ` Mike Galbraith
2014-07-27 19:34 ` Yuyang Du
2014-07-28 7:49 ` Mike Galbraith
2014-07-28 0:01 ` Yuyang Du
2014-07-28 8:55 ` Peter Zijlstra
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