linux-kernel - Re: sched: odd values for effective load calculations

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Message-ID: <20141216020948.GA6399@intel.com>
Date:	Tue, 16 Dec 2014 10:09:48 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: sched: odd values for effective load calculations

On Mon, Dec 15, 2014 at 11:51:46PM -0500, Sasha Levin wrote:
> On 12/15/2014 07:12 AM, Peter Zijlstra wrote:
> > 
> > Sorry for the long delay, I was out for a few weeks due to having become
> > a dad for the second time.
> 
> Congrats! May you be able to sleep at night sooner rather than later.
 
Congrats +1.

> 
> It's fairy reproducible, I've seen it happen quite a few times. What other
> information might be useful?
> 

Sasha, it might be helpful to see this_load is from:

this_load1: this_load = target_load(this_cpu, idx);

or

this_load2: this_load += effective_load(tg, this_cpu, -weight, -weight);

It really does not seem to be this_load1, while the calc of effective_load is a bit
complicated to see what the problem is.
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