linux-kernel - Re: [PATCH 3/7] idle, thermal, acpi: Remove home grown idle implementations

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Date:	Wed, 20 Nov 2013 17:59:21 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	lenb@...nel.org, rjw@...ysocki.net,
	Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	Chris Leech <christopher.leech@...el.com>,
	David Miller <davem@...emloft.net>, rui.zhang@...el.com,
	jacob.jun.pan@...ux.intel.com,
	Mike Galbraith <bitbucket@...ine.de>,
	Ingo Molnar <mingo@...nel.org>, hpa@...or.com,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 3/7] idle, thermal, acpi: Remove home grown idle
 implementations

On Wed, Nov 20, 2013 at 08:40:49AM -0800, Arjan van de Ven wrote:
> On 11/20/2013 8:04 AM, Peter Zijlstra wrote:
> >This does not fully preseve existing behaviour in that the generic
> >idle cycle function calls into the normal cpuidle governed idle
> >routines and should thus respect things like QoS parameters and the
> >like.
> 
> 
> NAK on the powerclamp side.
> 
> powerclamp MUST NOT do that....
> it is needed to go to the deepest state no matter what
> (this is for when your system is overheating. there is not a lot of choice
> here... alternative is an emergency reset that the hardware does for safety)

Then its a worse broken piece of shit than I thought it was.

The only way to do what you want is to pretty much do stop_machine().

There's no guarantee your current FIFO-50 tasks will ever get to run.

Also, since when does Intel hardware do emergency resets on thermal
events? It used to force throttle stuff.
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