Re: Perf framework : Cluster based counter support

From: Mukesh Ojha
Date: Mon Jul 01 2019 - 11:39:41 EST



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 ?


Thanks.
Mukesh







Thanks,
Mark.