Messages in this thread |  | | Date | Thu, 13 Sep 2012 17:21:45 +0200 | From | Robert Richter <> | Subject | Re: [PATCH] perf record: Change error message on failure |
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On 13.09.12 17:07:20, Ingo Molnar wrote: > > * Robert Richter <robert.richter@amd.com> wrote: > > > Only report > > > > No CONFIG_PERF_EVENTS=y kernel support configured? > > > > if the syscall fails with ENOSYS. In other cases CONFIG_PERF_EVENTS is > > set and might confuse users. The default message is now: > > > > Not all events could be opened. > > Indeed, and it would be nice to be even less passive-aggressive > and figure out and display the exact error condition?
The complete error message shows the error condition and is like the following:
# perf record -e cycles:ppk sleep 1
Error: sys_perf_event_open() syscall returned with 22 (Invalid argument). /bin/dmesg may provide additional information.
Not all events could be opened. sleep: Terminated
-Robert
-- Advanced Micro Devices, Inc. Operating System Research Center
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