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

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Message-ID: <20111107153439.GG8670@redhat.com>
Date:	Mon, 7 Nov 2011 17:34:39 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	kvm@...r.kernel.org, avi@...hat.com, 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 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.

--
			Gleb.
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