linux-kernel - [PATCH 2/6] perf record: Add ID and to recorded event data when recording multiple events

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Message-Id: <1267804269-22660-2-git-send-email-acme@infradead.org>
Date:	Fri,  5 Mar 2010 12:51:05 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, Eric B Munson <ebmunson@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 2/6] perf record: Add ID and to recorded event data when recording multiple events

From: Eric B Munson <ebmunson@...ibm.com>

Currently perf record does not write the ID or the to disk for events.
This doesn't allow report to tell if an event stream contains one or
more types of events.  This patch adds this entry to the list of data
that record will write to disk if more than one event was requested.

Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Eric B Munson <ebmunson@...ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-record.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 771533c..f573bbb 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -244,6 +244,9 @@ static void create_counter(int counter, int cpu, pid_t pid)
 
 	attr->sample_type	|= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 
+	if (nr_counters > 1)
+		attr->sample_type |= PERF_SAMPLE_ID;
+
 	if (freq) {
 		attr->sample_type	|= PERF_SAMPLE_PERIOD;
 		attr->freq		= 1;
-- 
1.5.5.6

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