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

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Date:   Mon, 24 Oct 2016 11:42:31 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
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

On Mon, Oct 24, 2016 at 11:23:28AM +0200, Ingo Molnar wrote:
> 
> * 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.

ok, will do

thanks,
jirka