linux-kernel - Re: [GIT PULL 00/52] New Tool: perf c2c

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Date:   Mon, 24 Oct 2016 11:23:28 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org, Linux Weekly News <lwn@....net>,
        Andi Kleen <andi@...stfloor.org>,
        David Ahern <dsahern@...il.com>,
        Don Zickus <dzickus@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
        Joe Mario <jmario@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 00/52] New Tool: perf c2c


* Jiri Olsa <jolsa@...hat.com> wrote:

> > If I do 'perf report' I get two events:
> > 
> >  Available samples
> >  24K cpu/mem-loads,ldlat=30/P
> >  45K cpu/mem-stores/P
> > 
> > and both have some real data.
> > 
> > What am I missing?
> 
> hm, most likely you did not generate any remote HITMs.. if it was on the laptop?

Yeah.

> you might get some results for local HITMs with -d option:
> 
>   $ perf c2c report -d lcl
> 
> the default display/filter is for Remote HITMs.. perhaps we could be
> smart enough and switch to local when we found no data for remote

Yeah, this did the trick.

Could we please make sure there's always actionable output by the tool? I.e. it 
should either clearly refuse to work (due to lack of hw), or it should produce 
something meaningful.

Thanks,

	Ingo