linux-kernel - Re: [PATCH] perf record: enable multiplexing scaling via -R

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Message-ID: <20170822012545.GJ2482@two.firstfloor.org>
Date:   Mon, 21 Aug 2017 18:25:45 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     Andi Kleen <andi@...stfloor.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "mingo@...e.hu" <mingo@...e.hu>,
        "Liang, Kan" <kan.liang@...el.com>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] perf record: enable multiplexing scaling via -R

On Mon, Aug 21, 2017 at 05:13:29PM -0700, Stephane Eranian wrote:
> On Mon, Aug 21, 2017 at 4:02 PM, Andi Kleen <andi@...stfloor.org> wrote:
> >
> > Stephane Eranian <eranian@...gle.com> writes:
> > >
> > > To activate, the user must use:
> > > $ perf record -a -R ....
> >
> > I don't know why you're overloading the existing raw mode?
> >
> > It has nothing to do with that.
> >
> I explained this in the changelog. So that is does not change any of
> the processing in perf report, i.e., no faced with data it does not
> know how to handle.
> Also trying to avoid adding yet another option.

But raw is needed for some of the non Intel PMUs. I believe it's 
the only way to use AMD IBS. You may as well break their usage.

You'll need a new option.

-Andi