linux-kernel - Re: [PATCH] kvm: optimize ISR lookups

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Message-ID: <20120521225010.GN17031@redhat.com>
Date:	Tue, 22 May 2012 01:50:12 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	kvm@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kvm: optimize ISR lookups

On Tue, May 22, 2012 at 12:44:39AM +0200, Thomas Gleixner wrote:
> Michael,
> 
> On Tue, 22 May 2012, Michael S. Tsirkin wrote:
> > On Tue, May 22, 2012 at 12:14:18AM +0200, Thomas Gleixner wrote:
> > > On Tue, 22 May 2012, Michael S. Tsirkin wrote:
> > > 
> > > > On Mon, May 21, 2012 at 11:04:25PM +0200, Thomas Gleixner wrote:
> > > > > > @@ -242,6 +262,25 @@ static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
> > > > > >  		apic->irr_pending = true;
> > > > > >  }
> > > > > >  
> > > > > > +static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
> > > > > > +{
> > > > > > +	if (!__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
> > > > > > +		++apic->isr_count;
> > > > > > +	ASSERT(apic->isr_count > MAX_APIC_VECTOR);
> > > > > 
> > > > > I'm really curious what you observed when defining DEBUG in that file.
> > > > > 
> > > > > Clearly you never did.
> > > > 
> > > > Sorry :(
> > > > Yes clearly silly, thanks for pointing this out.
> > > 
> > > That's all you have a reply for? That's the least of the problems ....
> > 
> > Others are not my fault :)
> 
> Interesting. The other changes you added are not your fault?
> 
> So you provided a patch which you didn't author completely. You merily
> added the bogus ASSERTs, right ?
> 
> Can you please explain why there is only your SOB on that patch?
> 
> Thanks,
> 
> 	tglx

I authored the patch, sorry if I didn't make it clear:
the bitmap data-structure that you noted as inefficient
is part of Linux, I merely keep it as it is upstream.

I'll reply to the original mail, it's easier.

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