On Mon, Jul 01, 2019 at 09:09:33PM +0530, Mukesh Ojha wrote: > > On 6/28/2019 10:29 PM, Mark Rutland wrote: > > On Fri, Jun 28, 2019 at 10:23:10PM +0530, Mukesh Ojha wrote: > > > Hi All, > > Hi Mukesh, > > > > > Is it looks considerable to add cluster based event support to add in > > > current perf event framework and later in userspace perf to support > > > such events ? > > Could you elaborate on what you mean by "cluster based event"? > > > > I assume you mean something like events for a cluster-affine shared > > resource like some level of cache? > > > > If so, there's a standard pattern for supporting such system/uncore > > PMUs, see drivers/perf/qcom_l2_pmu.c and friends for examples. > > Thanks Mark for pointing it out. > Also What is stopping us in adding cluster based event e.g L2 cache hit/miss > or some other type raw events in core framework ?
That depends on how the event is exposed. If it's exposed via the architectural PMU, then it's already accessible as a raw (cpu-affine) event, regardless of whether that makes sense. If it's a separate PMU (as I suspect is the case), then it simply has to be a separate PMU driver. Thanks, Mark.
