linux-kernel - Re: [PATCHv2 2/9] KVM: Expose a version 2 architectural PMU to a guests

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Date:	Mon, 07 Nov 2011 17:40:00 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, kvm@...r.kernel.org,
	mtosatti@...hat.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	acme@...stprotocols.net, Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCHv2 2/9] KVM: Expose a version 2 architectural PMU to a
 guests

On 11/07/2011 05:34 PM, Gleb Natapov wrote:
> On Mon, Nov 07, 2011 at 03:22:05PM +0100, Peter Zijlstra wrote:
> > On Thu, 2011-11-03 at 14:33 +0200, Gleb Natapov wrote:
> > > @@ -35,6 +35,7 @@ config KVM
> > >         select KVM_MMIO
> > >         select TASKSTATS
> > >         select TASK_DELAY_ACCT
> > > +       select PERF_EVENTS 
> > 
> > Do you really want to make that an unconditional part of KVM? I know we
> > can't currently build x86 without perf due to that hw breakpoint
> > trainwreck, but people were actually wanting to solve that.
> > 
> I am fine either way (the only thing is that I can't check that I can
> build kvm without pmu right now). But I doubt that there will be many
> KVM deployment without perf enabled and making it optional will increase
> test matrix. KVM has pretty extensive list of selects already for that
> reason. I let maintainers to decide on this.

I prefer to avoid the select, when possible.  But that can be done after
PERF_EVENTS is disentangled from x86.

-- 
error compiling committee.c: too many arguments to function

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