linux-kernel - Re: 2.6.22-rc1-mm1 [cannot change thermal trip points]

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Message-ID: <20070521224200.GF10714@elf.ucw.cz>
Date:	Tue, 22 May 2007 00:42:00 +0200
From:	Pavel Machek <pavel@....cz>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Len Brown <lenb@...nel.org>, trenn@...e.de,
	Chuck Ebbert <cebbert@...hat.com>, len.brown@...el.com,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: 2.6.22-rc1-mm1 [cannot change thermal trip points]

On Mon 2007-05-21 14:45:53, Matthew Garrett wrote:
> On Mon, May 21, 2007 at 03:40:46PM +0200, Pavel Machek wrote:
> > On Mon 2007-05-21 14:36:08, Matthew Garrett wrote:
> > > On Mon, May 21, 2007 at 03:29:48PM +0200, Pavel Machek wrote:
> > > > Significantly more correct? It forces you to do all the thermal
> > > > management in userspace!
> > > 
> > > Why's that a problem? 
> > 
> > Duplicating all the kernel logic in userspace, badly?
> 
> So don't do it badly. The advantage of doing so is that you can make it 
> work properly, which you can't by putting it in the kernel.

You want stuff like critical shutdowns to work even if userspace is
dead.

I do not think you can control passive cooling adequately from
userspace, and you can certainly not prevent kernel from slowing
machine down too soon.

Plus, this is actually nasty user-visible change, and a regression
from 2.6.21. I am not sure why we are even debating this; user-kernel
interface changed without warning. Patch should be simply reverted.

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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