linux-kernel - [PATCH 2/4] perf record: Fix use of sample_id_all userspace with !sample_id

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Date:	Mon, 27 Dec 2010 20:00:11 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Torok Edwin <edwintorok@...il.com>,
	Ian Munsie <imunsie@....ibm.com>
Subject: [PATCH 2/4] perf record: Fix use of sample_id_all userspace with !sample_id_all kernels

From: Arnaldo Carvalho de Melo <acme@...hat.com>

Check if parse_single_tracepoint_event has already asked for PERF_SAMPLE_TIME.

This is kludgy but short term fix for problems introduced by eac23d1c that
broke 'perf script' by having different sample_types when using multiple
tracepoint events when we use a perf binary that tries to use sample_id_all on
an older kernel.

We need to move counter creation to perf_session, support different
sample_types, etc.

Ongoing work on the perf test infrastructure needs this so that we can create
counters to monitor threads generating specific events, etc.

Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Tom Zanussi <tzanussi@...il.com>
Cc: Torok Edwin <edwintorok@...il.com>
Cc: Ian Munsie <imunsie@....ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-record.c |   24 +++++++++++++++++++-----
 1 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 5149e3d..50efbd5 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -243,6 +243,19 @@ static void create_counter(int counter, int cpu)
 		u64 time_running;
 		u64 id;
 	} read_data;
+	/*
+ 	 * Check if parse_single_tracepoint_event has already asked for
+ 	 * PERF_SAMPLE_TIME.
+ 	 *
+	 * XXX this is kludgy but short term fix for problems introduced by
+	 * eac23d1c that broke 'perf script' by having different sample_types
+	 * when using multiple tracepoint events when we use a perf binary
+	 * that tries to use sample_id_all on an older kernel.
+ 	 *
+ 	 * We need to move counter creation to perf_session, support
+ 	 * different sample_types, etc.
+ 	 */
+	bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
 
 	attr->read_format	= PERF_FORMAT_TOTAL_TIME_ENABLED |
 				  PERF_FORMAT_TOTAL_TIME_RUNNING |
@@ -285,7 +298,8 @@ static void create_counter(int counter, int cpu)
 	if (system_wide)
 		attr->sample_type	|= PERF_SAMPLE_CPU;
 
-	if (sample_time || system_wide || !no_inherit || cpu_list)
+	if (sample_id_all_avail &&
+	    (sample_time || system_wide || !no_inherit || cpu_list))
 		attr->sample_type	|= PERF_SAMPLE_TIME;
 
 	if (raw_samples) {
@@ -294,9 +308,6 @@ static void create_counter(int counter, int cpu)
 		attr->sample_type	|= PERF_SAMPLE_CPU;
 	}
 
-	if (!sample_type)
-		sample_type = attr->sample_type;
-
 	attr->mmap		= track;
 	attr->comm		= track;
 	attr->inherit		= !no_inherit;
@@ -327,7 +338,7 @@ try_again:
 				 * Old kernel, no attr->sample_id_type_all field
 				 */
 				sample_id_all_avail = false;
-				if (!sample_time && !raw_samples)
+				if (!sample_time && !raw_samples && !time_needed)
 					attr->sample_type &= ~PERF_SAMPLE_TIME;
 
 				goto retry_sample_id;
@@ -428,6 +439,9 @@ try_again:
 			}
 		}
 	}
+
+	if (!sample_type)
+		sample_type = attr->sample_type;
 }
 
 static void open_counters(int cpu)
-- 
1.6.2.5

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