Re: [PATCH] perf, record: Add clockid parameter

[Arnaldo Carvalho de Melo]

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
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