linux-kernel - Re: Seems like "sched: Add missing call to calc_load_exit

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Date:	Fri, 05 Oct 2012 19:23:19 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jonathan Nieder <jrnieder@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Huacai Chen <chenhc@...ote.com>,
	Charles Wang <muming.wq@...bao.com>,
	Ingo Molnar <mingo@...nel.org>, stable@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Seems like "sched: Add missing call to calc_load_exit_idle()"
 should be reverted in 3.5 branch

On Fri, 2012-10-05 at 10:10 -0700, Jonathan Nieder wrote:
> Peter Zijlstra wrote:
> > On Thu, 2012-10-04 at 15:27 -0700, Greg Kroah-Hartman wrote:
> 
> >> I'm puzzled as well.  Any ideas if I should do anything here or not?
> >
> > So I think the current v3.5.5 code is fine.
> 
> Now I'm puzzled.  You wrote:
> 
> | However, since we don't restart the tick, we won't be sampling load muck
> | and calling calc_load_exit_idle() from there is bound to confuse state.
> 
> Doesn't that mean 900404e5d201 "sched: Add missing call to
> calc_load_exit_idle()" which is part of 3.5.5 was problematic?  Or
> did I just miscount the number of "not"s?


Argh, yeah, so now I've managed to confuse everyone I'm afraid.

You are right, v3.5.5 has one calc_load_exit_idle() too many, the one in
tick_nohz_update_jiffies() needs to go.

Sorry.. I got entirely confused figuring out wth happened with 3.6.

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