Re: [PATCH] perf/core: generate overflow signal when samples are dropped (WAS: Re: [REGRESSION] perf/core: PMU interrupts dropped if we entered the kernel in the "skid" region)

From: Peter Zijlstra
Date: Tue Jul 04 2017 - 05:46:23 EST

On Tue, Jul 04, 2017 at 10:33:45AM +0100, Mark Rutland wrote:

> > That said, with a per-cpu event the TID sample value is indeed subject
> > to skid like you describe.
> For per-cpu events, does that matter? Those don't have TID filters in
> the first place, no?

eBPF can do all sorts I suppose.

But yes, at some point you just have to give up, there's only so much
one can do.