linux-kernel - Re: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes

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Message-Id: <1225817939.6422.1282948693@webmail.messagingengine.com>
Date:	Tue, 04 Nov 2008 17:58:59 +0100
From:	"Alexander van Heukelum" <heukelum@...tmail.fm>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Cyrill Gorcunov" <gorcunov@...il.com>,
	"Alexander van Heukelum" <heukelum@...lshack.com>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, lguest@...abs.org,
	jeremy@...source.com, "Steven Rostedt" <srostedt@...hat.com>,
	"Mike Travis" <travis@....com>
Subject: Re: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes


On Tue, 4 Nov 2008 17:54:09 +0100, "Ingo Molnar" <mingo@...e.hu> said:
> 
> * Alexander van Heukelum <heukelum@...tmail.fm> wrote:
> 
> > > My estimation is that if we do it right, your approach will behave 
> > > better on modern CPUs (which is what matters most for such 
> > > things), especially on real workloads where there's a considerable 
> > > instruction-cache pressure. But it should be measured in any case.
> > 
> > Fully agreed. I will do some measurements in the near future, maybe 
> > next week. At least noone came up with an absolutely blocking 
> > problem with this approach ;).
> 
> how about "it does not build with lguest enabled" as a blocking 
> problem? ;-)

Blocking for applying the patch as is, sure... As a proof of concept
it is still fine ;).

>   arch/x86/lguest/built-in.o: In function `lguest_init_IRQ':
>   boot.c:(.init.text+0x33f): undefined reference to `interrupt'

It just needs to be fixed. I guess similar problems are to
be expected with xen or um.

Thanks,
    Alexander

> config attached.
> 
> 	Ingo
-- 
  Alexander van Heukelum
  heukelum@...tmail.fm

-- 
http://www.fastmail.fm - mmm... Fastmail...

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