linux-kernel - Re: [RFC] perf/core: what is exclude

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Message-ID: <20180420083607.GG4064@hirez.programming.kicks-ass.net>
Date:   Fri, 20 Apr 2018 10:36:07 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vince Weaver <vincent.weaver@...ne.edu>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>, mingo@...e.hu,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [RFC] perf/core: what is exclude_idle supposed to do

On Wed, Apr 18, 2018 at 11:10:20AM -0400, Vince Weaver wrote:
> On Tue, 17 Apr 2018, Jiri Olsa wrote:
> 
> > On Mon, Apr 16, 2018 at 10:04:53PM +0000, Stephane Eranian wrote:
> > > Hi,
> > > 
> > > I am trying to understand what the exclude_idle event attribute is supposed
> > > to accomplish.
> > > As per the definition in the header file:
> > > 
> > >     exclude_idle   :  1, /* don't count when idle */
> > 
> > AFAICS it's not implemented
> 
> so just to be completely clear hear, we're saying that the "exclude_idle" 
> modifier has never done anything useful and still doesn't?

AFAICT it works on Power and possibly ARM.