linux-kernel - Re: [PATCH V3 1/4] perf: Add PERF_RECORD

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Date:	Wed, 8 Jul 2015 11:56:56 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	mathieu.poirier@...aro.org, Pawel Moll <pawel.moll@....com>
Subject: Re: [PATCH V3 1/4] perf: Add PERF_RECORD_SWITCH to indicate context
 switches

Em Wed, Jul 08, 2015 at 04:42:03PM +0300, Adrian Hunter escreveu:
> On 08/07/15 16:28, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Jul 08, 2015 at 12:52:40AM +0200, Peter Zijlstra escreveu:
> >> On Tue, Jul 07, 2015 at 01:13:59PM -0300, Arnaldo Carvalho de Melo wrote:
> >>> Em Tue, Jul 07, 2015 at 05:36:14PM +0200, Peter Zijlstra escreveu:
> >> I was just thinking that 2 records, each with a fixed layout would be
> >> easier to parse than 1 record with variable layout.

> >> The record space is immense, so from that point it really doesn't
> >> matter.

> > We could do a land grab at some point there, if/when we find some reason
> > for that... :-)

> >> Do whatever is easiest, less mistakes get made etc. :-)

> >> No real preference either way, as long we we've thought about it.

> > Right, I just don't want to have two u32 carrying -1 for no reason.

> So you'd be OK with 2 RECORD types?

Yeah, no problem.
 
> I will see what is involved.

Ok.

- Arnaldo
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