Em Fri, Mar 27, 2015 at 11:35:25AM -0600, David Ahern escreveu: > On 3/27/15 11:20 AM, Peter Zijlstra wrote: > >>This is a new feature which means use_clockid on older kernels will fail. So > >>need to catch that and throw an error -- perhaps yet another probe function.
> >How does that work? What do I grep to find an example? I figured if the > >kernel didn't support the syscall will fail and we'll terminate > >someplace. > Look at __perf_evsel__open(). In this case you probably do not want > to fallback but tell the user the clock id option is not supported. > The problem is deciphering the failure is due to the clock id versus > all the other failure reasons. I.e. we're back to the sys_perf_event_open() error reporting suckz rockz thing, this time with PeterZ trying to find a way to avoid getting back to that discussion... /me runz... ;-P - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
