linux-kernel - Re: [PATCH 3/3] KVM: perf: kvm events analysis tool

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Date:	Tue, 17 Jan 2012 09:59:13 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Stefan Hajnoczi <stefanha@...il.com>
Cc:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Avi Kivity <avi@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 3/3] KVM: perf: kvm events analysis tool

On Mon, Jan 16, 2012 at 10:08:40AM +0000, Stefan Hajnoczi wrote:
> On Mon, Jan 16, 2012 at 9:32 AM, Xiao Guangrong
> <xiaoguangrong@...ux.vnet.ibm.com> wrote:
> > +DESCRIPTION
> > +-----------
> > +You can analyze some crucial events and statistics with this
> > +'perf kvm-events' command.
> 
> This line is very general and does not explain which events/statistics
> can be collected or how you can use that information.  I suggest
> making this description more specific.  Explain that this subcommand
> observers kvm.ko tracepoints and annotates/decodes them with
> additional information (this is why I would use this command and not
> raw perf record -e kvm:\*).
> 
> > +       { SVM_EXIT_MONITOR,                     "monitor" }, \
> > +       { SVM_EXIT_MWAIT,                       "mwait" }, \
> > +       { SVM_EXIT_XSETBV,                      "xsetbv" }, \
> > +       { SVM_EXIT_NPF,                         "npf" }
> 
> All this copy-paste could be avoided by sharing this stuff with the
> arch/x86/kvm/ code.

Yes, same for KVM_MAX_VCPUS.

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