[PATCH V1] perf: qcom: Add L3 cache PMU driver

[Peter Zijlstra]

On Fri, Mar 18, 2016 at 04:37:02PM -0400, Agustin Vega-Frias wrote:
> This adds a new dynamic PMU to the Perf Events framework to program
> and control the L3 cache PMUs in some Qualcomm Technologies SOCs.
> 
> The driver supports a distributed cache architecture where the overall
> cache is comprised of multiple slices each with its own PMU. The driver
> aggregates counts across the whole system to provide a global picture
> of the metrics selected by the user.

So is there never a situation where you want to profile just a single
slice?

It userspace at all aware of these slices through other means?

That is; typically we do not aggregate in-kernel like this but simply
expose each slice as a separate PMU and let userspace sort things.