linux-kernel - Re: [PATCH -tip v2 2/6] perf bts: Introduce new sub command 'perf bts trace'

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Date:	Tue, 21 Dec 2010 20:56:23 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	2nddept-manager@....hitachi.co.jp,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH -tip v2 2/6] perf bts: Introduce new sub command 'perf
 bts trace'

On Tue, 2010-12-21 at 20:02 +0100, Frederic Weisbecker wrote:

> This could be a PERF_SAMPLE_RAW may be?

Well clearly not ;-)

But maybe we can do something like: PERF_RECORD_SAMPLES (note the
plural):

struct {
	struct perf_event_header		header;

	u64					nr;
	u32					common_type;
	u32					data_type;

	struct perf_sample			common;
	struct perf_sample			data[nr];
}

Where struct perf_sample is PERF_RECORD_SAMPLE without the
perf_event_header bit.

Where we can split the many samples into a piece that is the same for
all perf_samples::common, where the content specified by the
PERF_SAMPLE_ bits from ::common_type, and the the rest lives in data[]
specified by the PERF_SAMPLE_ bits from ::data_type.


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