On Thu, Nov 09, 2017 at 06:55:25AM -0800, Andi Kleen wrote:
> From: Andi Kleen <[email protected]>
>
> To process metrics, perf script needs to know the scaling
> factors reported by sysfs for events. Save the scaling factors
> in the perf.data metadata in a new SCALE header.
>
> Signed-off-by: Andi Kleen <[email protected]>
there's event_update event for scale and some other evsel stuff
that was before we were able to put header through pipe
it might be less code changes.. sythesize it via:
if (has_scale(counter)) {
err = perf_event__synthesize_event_update_scale(NULL, counter,
process_synthesized_event);
if (err < 0) {
pr_err("Couldn't synthesize evsel scale.\n");
return err;
}
}
and new tool's event_update callback, which is already implemented
in perf_event__process_event_update
having event instead of header feature might have
other drawbacks.. not sure it will fit here
jirka
