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

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Date:	Mon, 3 Mar 2014 10:05:31 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	Andi Kleen <andi@...stfloor.org>, 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 01:03:31PM -0800, Davidlohr Bueso wrote:
> On Fri, 2014-02-28 at 14:46 -0500, Don Zickus wrote:
> > 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, },
> > > 
> 
> Hmm I'm getting this when running a simple record command. 
> 
> invalid or unsupported event: 'cpu/mem-loads/pp'
> 
> This only occurs with c2c, other subcommands work normally. It's as if
> it were an old kernel, but it's Linus' latest. Is this an issue with the
> patch or something I'm missing?
> 
> Furthermore, I see:
> ls /sys/bus/event_source/devices/cpu/events
> branch-instructions  branch-misses  cache-misses  cache-references  cpu-cycles  instructions  mem-loads

Hmm, so based on Andi's reply, I am assuming you are running on a Westmere
(or Nehalem) due to the lack of mem-stores.

If you don't have mem-stores, this tool isn't going to work.  The tool can
only detect contention when sampling reads _and_ writes to the same
addresses.

Cheers,
Don
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