linux-kernel - [tip:perf/urgent] perf stat: Failure with "Operation not supported"

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Message-ID: <tip-38f6ae1e1b0d5e8b0a95f88c1eee2c5e8b001631@git.kernel.org>
Date:	Wed, 7 Dec 2011 20:34:10 -0800
From:	tip-bot for Anton Blanchard <anton@...ba.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	anton@...ba.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, fweisbec@...il.com, dsahern@...il.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf stat: Failure with "Operation not supported"

Commit-ID:  38f6ae1e1b0d5e8b0a95f88c1eee2c5e8b001631
Gitweb:     http://git.kernel.org/tip/38f6ae1e1b0d5e8b0a95f88c1eee2c5e8b001631
Author:     Anton Blanchard <anton@...ba.org>
AuthorDate: Fri, 2 Dec 2011 09:38:33 +1100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 5 Dec 2011 14:32:40 -0200

perf stat: Failure with "Operation not supported"

perf stat is failing on PowerPC:

  Error: open_counter returned with 95 (Operation not supported). /bin/dmesg may provide additional information.

  Fatal: Not all events could be opened.

commit 370faf1dd046 (perf stat: Fail softly on unsupported events)
added a check for failure returning ENOENT, but the POWER backend
returns EOPNOTSUPP. It looks like alpha, blackfin and mips do the
same.

With the patch applied, things work as expected:

 Performance counter stats for '/bin/true':

          0.362176 task-clock                #    0.623 CPUs utilized
                 0 context-switches          #    0.000 M/sec
                 0 CPU-migrations            #    0.000 M/sec
                28 page-faults               #    0.077 M/sec
         1,677,020 cycles                    #    4.630 GHz
   <not supported> stalled-cycles-frontend
   <not supported> stalled-cycles-backend
           431,220 instructions              #    0.26  insns per cycle
           101,889 branches                  #  281.325 M/sec
             4,145 branch-misses             #    4.07% of all branches

       0.000581361 seconds time elapsed

Cc: <stable@...nel.org> # 3.0+
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/20111202093833.5fef7226@kryten
Signed-off-by: Anton Blanchard <anton@...ba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-stat.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 7d98676..955930e 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -463,7 +463,8 @@ static int run_perf_stat(int argc __used, const char **argv)
 
 	list_for_each_entry(counter, &evsel_list->entries, node) {
 		if (create_perf_stat_counter(counter, first) < 0) {
-			if (errno == EINVAL || errno == ENOSYS || errno == ENOENT) {
+			if (errno == EINVAL || errno == ENOSYS ||
+			    errno == ENOENT || errno == EOPNOTSUPP) {
 				if (verbose)
 					ui__warning("%s event is not supported by the kernel.\n",
 						    event_name(counter));
--
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