linux-kernel - Re: [PATCHv6 2/8] kvm: optimize ISR lookups

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Date:	Wed, 13 Jun 2012 12:26:05 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	x86@...nel.org, kvm@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Avi Kivity <avi@...hat.com>,
	gleb@...hat.com, Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCHv6 2/8] kvm: optimize ISR lookups

On Wed, Jun 13, 2012 at 12:02:42PM +0300, Michael S. Tsirkin wrote:
> > Instead of isr_cache what about a highest_isr field?
> 
> > 
> > When setting ISR:
> > 
> > if (apic->highest_isr < me)
> > 	apic->highest_isr = me;
> > 
> > To be invalidated on TPR updates properly.
> > 
> > Its more meaningful.
> 
> OK, I'll rename it highest_isr

Even better - highest_isr_cache.
Makes it explicit that it can be invalid.

-- 
MST
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