Commit-ID: 6880bbf96930ec6f8b40b5b93f21973f3297672a
Gitweb: http://git.kernel.org/tip/6880bbf96930ec6f8b40b5b93f21973f3297672a
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 18 Feb 2016 13:40:57 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 19 Feb 2016 19:12:43 -0300
perf tests: Use perf_evlist__strerror_open() to provide hints about max_freq
Before:
# perf test -v "code reading" 2>&1 | tail -4
perf_evlist__open failed
test child finished with -1
---- end ----
Test object code reading: FAILED!
#
After:
# perf test -v "code reading" 2>&1 | tail -7
perf_evlist__open() failed!
Error: Invalid argument.
Hint: Check /proc/sys/kernel/perf_event_max_sample_rate.
Hint: The current value is 1000 and 4000 is being requested.
test child finished with -1
---- end ----
Test object code reading: FAILED!
#
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Steven Noonan <steven@xxxxxxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-ifbx7vmrc38loe6317owz2jx@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/tests/code-reading.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 313a48c..f84339c 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -559,7 +559,13 @@ static int do_test_code_reading(bool try_kcore)
evlist = NULL;
continue;
}
- pr_debug("perf_evlist__open failed\n");
+
+ if (verbose) {
+ char errbuf[512];
+ perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
+ pr_debug("perf_evlist__open() failed!\n%s\n", errbuf);
+ }
+
goto out_put;
}
break;
--
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