linux-kernel - Re: [RFC 0/4] perf tool: Adding ratios support

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Message-ID: <20130122094517.GD12295@mudshark.cambridge.arm.com>
Date:	Tue, 22 Jan 2013 09:45:17 +0000
From:	Will Deacon <will.deacon@....com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zij@....arm.com>
Subject: Re: [RFC 0/4] perf tool: Adding ratios support

On Mon, Jan 21, 2013 at 07:13:25PM +0000, Jiri Olsa wrote:
> On Thu, Jan 17, 2013 at 10:23:26AM +0000, Will Deacon wrote:
> > On Wed, Jan 16, 2013 at 01:30:33PM +0000, Jiri Olsa wrote:
> > > On Wed, Jan 16, 2013 at 01:13:18PM +0000, Will Deacon wrote:
> > > > On Tue, Jan 15, 2013 at 01:39:50PM +0000, Jiri Olsa wrote:
> > > > > The formula can currently contain any event from the set::events
> > > > > plus any number (int). There'll be support in future for outside
> > > > > values runtime and other if needed.
> > > > 
> > > > Just to say that I *really* like this idea! If we extended it to include
> > > > other operators then it would help us on ARM, where we often have events
> > > > like 'cache accesses' and 'cache misses' but not 'cache hits'.
> > > 
> > > great, thanks for sharing this
> > > 
> > > The current operators set is just basic one to show the idea,
> > > it can/will be expanded.
> > 
> > Makes sense.
> 
> any particular operators you'd like to see in?

I think the basic: add, subtract, divide operators are the most useful to
start with.

Cheers,

Will
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