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

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Date:	Tue, 24 Jan 2012 14:49:50 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Marcelo Tosatti <mtosatti@...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 01/17/2012 04:30 AM, Xiao Guangrong wrote:
> On 01/16/2012 06:04 PM, Avi Kivity wrote:
>
> > On 01/16/2012 11:32 AM, Xiao Guangrong wrote:
> >> Add 'perf kvm-events' support to analyze kvm vmexit/mmio/ioport smartly
> >>
> >> Usage:
> >> 	perf kvm-events record
> > 
> > Why not 'perf record -e kvm'?
>
>
> It works, many perf tools have this style, like:
> perf lock record,
> perf sched record,
> perf kmem record,
>
> I think the reason is that only enable the tracepoints we need to avoid
> unnecessary overload so that the result is more exacter.

Maybe a virtual event list:

  perf record -e kvm-pio

This allows us to combine the event list with other events:

  perf record -e kvm-pio -e timer


> >> +
> >> +	while (table_size--) {
> >> +		if (table->exit_code == exit_code)
> >> +			return table->reason;
> > 
> > ... table[exit_code] ...
> > 
>
>
> Actually, this array is not indexed by exit_code, it means:
> table[exit_code].exit_code != exit_code.

So make it indexed by exit code.



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

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