Re: [PATCH] perf record: Change error message on failure

[Robert Richter]

On 13.09.12 17:07:20, Ingo Molnar wrote:
> 
> * Robert Richter <robert.richter@xxxxxxx> 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/