linux-kernel - Re: "Test object code reading" failing, debug messages don't help

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Date:	Tue, 12 Nov 2013 09:59:33 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: "Test object code reading" failing, debug messages don't help

On 11/11/13 21:58, Arnaldo Carvalho de Melo wrote:
> Em Mon, Nov 11, 2013 at 04:55:59PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Mon, Nov 11, 2013 at 04:51:17PM -0300, Arnaldo Carvalho de Melo escreveu:
>>> Hi Adrian,
>>>
>>> 	I have perf test failing here:
>>>
>>> [root@...andy ~]# perf test 21
>>> 21: Test object code reading                               : FAILED!
>>> [root@...andy ~]# 
>>>
>>> Try it with -v, but all messages, except for that elf header, which I
>>> assume is for a previous entry that is not suitable and should not be
>>> considered, seems to say all is well, except that the test fails :-\
>>
>> If I try gdb on test__code_reading, go on stepping thru it to try to
>> figure out why it fails, it works :-\
> 
> Why this is so is still unclear, but since the other problem I had was
> due to the kernel reducing the max sample_freq, I tried:
> 
> [root@...andy ~]# echo 10000 > /proc/sys/kernel/perf_event_max_sample_rate 
> [root@...andy ~]# perf test 21
> 21: Test object code reading                               : Ok
> [root@...andy ~]# echo 7000 > /proc/sys/kernel/perf_event_max_sample_rate 
> [root@...andy ~]# perf test 21
> 21: Test object code reading                               : FAILED!
> [root@...andy ~]# 


From: Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH] perf tests: Handle throttle events in 'object code reading' test

Unhandled events cause an error that fails the test

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/tests/code-reading.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 6d9dc19..85d4919 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -275,8 +275,19 @@ static int process_event(struct machine *machine, struct perf_evlist *evlist,
 	if (event->header.type == PERF_RECORD_SAMPLE)
 		return process_sample_event(machine, evlist, event, state);
 
-	if (event->header.type < PERF_RECORD_MAX)
-		return machine__process_event(machine, event, NULL);
+	if (event->header.type == PERF_RECORD_THROTTLE ||
+	    event->header.type == PERF_RECORD_UNTHROTTLE)
+		return 0;
+
+	if (event->header.type < PERF_RECORD_MAX) {
+		int ret;
+
+		ret = machine__process_event(machine, event, NULL);
+		if (ret < 0)
+			pr_debug("machine__process_event failed, event type %u\n",
+				 event->header.type);
+		return ret;
+	}
 
 	return 0;
 }
-- 
1.7.11.7


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