Re: Removal of events for unsupported architectures or processor models

On Wed, Jul 23, 2014 at 10:53:42PM +0300, Aaro Koskinen wrote:
> On Wed, Jul 23, 2014 at 09:17:43AM -0500, Maynard Johnson wrote:
> > Not a stupid question at all. Right now, timer mode is
> > supported only with the "legacy" opcontrol-based profiler.
> > The operf profiler could, theoretically, support a timer-like option
> > (e.g., configuring perf_events with PERF_COUNT_SW_CPU_CLOCK). I've not
> > been motivated to add this myself, but would certainly review patches
> > if anyone would like to contribute such support (after 1.0 is released).
> > But that may not help for your OMAP case anyway if perf_events is not
> > supported at all for that processor type.
> 
> Ok, thanks, I will try look into this at some point. I'm not yet too
> familiar with the perf world, but I think OMAP should support perf_events
> in general, but it's just some chip revisions where the HW counters
> could not be used / did not work.

perf has a timer interrupt fallback mode. This could be likely
used in some form in oprofile.

-Andi

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