linux-kernel - Re: [PATCH 08/19] perf c2c: Shared data analyser

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Message-ID: <20140228194642.GM25953@redhat.com>
Date:	Fri, 28 Feb 2014 14:46:42 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...stprotocols.net, LKML <linux-kernel@...r.kernel.org>,
	jolsa@...hat.com, jmario@...hat.com, fowles@...each.com,
	eranian@...gle.com, Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Richard Fowles <rfowles@...hat.com>
Subject: Re: [PATCH 08/19] perf c2c: Shared data analyser

On Fri, Feb 28, 2014 at 11:08:59AM -0800, Andi Kleen wrote:
> Don Zickus <dzickus@...hat.com> writes:
> > +
> > +static const struct perf_evsel_str_handler handlers[] = {
> > +	{ "cpu/mem-loads,ldlat=30/pp", perf_c2c__process_load, },
> > +	{ "cpu/mem-stores/pp",	       perf_c2c__process_store, },
> 
> The 30 magic number should probably be configurable.

Yeah, I just didn't figure out how to make it configurable yet within this
string.  

> 
> Using load-latency here rules out Atom, so at some point
> you would need to get rid of that.

Oh.  How do you get load-latency for Atom then?

> 
> I suspect on most systems you should rather use p 
> instead of pp to get the overhead down (before Haswell pp
> is expensive)

Ok.  Good to know.

> 
> > +static int perf_c2c__record(int argc, const char **argv)
> > +{
> > +	unsigned int rec_argc, i, j;
> > +	const char **rec_argv;
> > +	const char * const record_args[] = {
> > +		"record",
> > +		/* "--phys-addr", */
> 
> So is that needed or not?

No.  Legacy code before we had MMAP2 support.  I'll remove it next respin.

Cheers,
Don
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