diff options
author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-02-18 13:40:57 -0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-02-19 19:12:43 -0300 |
commit | 6880bbf96930ec6f8b40b5b93f21973f3297672a (patch) | |
tree | 75ef5c56f62c1e1c9944dabfdf3fc24011dc9bb4 /tools/perf/tests/code-reading.c | |
parent | d9aade7fd27a604bbffd363e6a68416ef51bab88 (diff) | |
download | linux-6880bbf96930ec6f8b40b5b93f21973f3297672a.tar.bz2 |
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@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Steven Noonan <steven@uplinklabs.net>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ifbx7vmrc38loe6317owz2jx@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/tests/code-reading.c')
-rw-r--r-- | tools/perf/tests/code-reading.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c index 313a48c6b2bc..f84339cb7f95 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; |