perf evlist: Handle -EINVAL for sample_freq > max_sample_rate in strerror_open()
When running the "code reading" test we get: # perf test -v "code reading" 2>&1 | tail -5 Parsing event 'cycles:u' perf_evlist__open failed test child finished with -1 ---- end ---- Test object code reading: FAILED! # And with -vv we get the errno value, -22, i.e. -EINVAL, but we can do better and handle the case at hand, with this patch it becomes: # 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! # Next patch will make this 'perf test' entry to use perf_evlist__strerror() 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-i31ai6kfefn75eapejjokfhc@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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