linux-kernel - Re: hardwired VMI crap

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Message-ID: <20070316101239.GB1821@elf.ucw.cz>
Date:	Fri, 16 Mar 2007 11:12:39 +0100
From:	Pavel Machek <pavel@....cz>
To:	Zachary Amsden <zach@...are.com>
Cc:	Ingo Molnar <mingo@...e.hu>, tglx@...utronix.de,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	john stultz <johnstul@...ibm.com>, akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Pratap Subrahmanyam <pratap@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	Daniel Hecht <dhecht@...are.com>,
	Daniel Arai <arai@...are.com>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: hardwired VMI crap

On Thu 2007-03-08 14:39:15, Zachary Amsden wrote:
> Ingo Molnar wrote:
> >* Zachary Amsden <zach@...are.com> wrote:
> >
> >  
> >>Ingo, either you or Thomas have vetoed every attempt we have made to 
> >>make our code operate with clockevents. [...]
> >>    
> >
> >this is news to me - do you have any proof of such a veto?
> >  
> 
> Yes, your refusal to discuss any technical details when asked point 
> blank which solution you prefer, and your continued whining and 
> threatening to unmerge our code.

Failing to answer a question is hardly a veto.

> And I ask again for your feedback on which approach you think is correct:

> 1) Rewrite the interrupt subsystem of our hypervisor, making it 
> incompatible with full virtualization, so that we can support an 
> abstract interrupt controller with a "clean" interface
> 2) Reuse the same method that HPET, PIT and other time clients in i386 
> use - the global_clock_event pointer which allows you to wrest control 
> back from the APIC and reuse the lapic_events local clockevents.
...

Do all of them then decide which code is nicest. I mean... this looks
like trap question for Ingo. He tells you 2, you'll do crappy
implementation of 2, and then claim Ingo can't object.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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