linux-kernel - Re: [PATCH 12/15] perf tools: allow non-matching sample types

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Message-ID: <51CA2205.4040006@gmail.com>
Date:	Tue, 25 Jun 2013 17:04:37 -0600
From:	David Ahern <dsahern@...il.com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	Adrian Hunter <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 12/15] perf tools: allow non-matching sample types

On 6/25/13 10:03 AM, Stephane Eranian wrote:
>> Stephane: are you looking at allowing sample_types per event?
>> >
> Yes, this is what I need. I have a kernel patch to do this. I don't
> know how to update perf to handle it correctly. So maybe you can
> help. My patch is useful to drastically reduce the size of the perf.data
> file in case we use the branch-stack with lots of events which is
> what our Gooda tool would like to do.

Refreshing my memory on the root problem here. It's a chicken-and-egg 
problem: we need the id in the sample to find the event (evsel) that 
generated it (perf_evlist__id2evsel). To get the id we need the 
sample_type to parse it and we want the sample_type to be per event.

As I recall this is where the conversation turns to per-event data files...

David
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