Re: [PATCH 19/21] x86/intel_rdt/mbm: Basic counting of MBM events (total and local)

From: Shivappa Vikas
Date: Thu Jul 06 2017 - 19:38:18 EST

On Sun, 2 Jul 2017, Thomas Gleixner wrote:

if (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID))
list_add_tail(&llc_occupancy_event.list, &r->evt_list);
+ if (is_mbm_total_enabled())
+ list_add_tail(&mbm_total_event.list, &r->evt_list);
+ if (is_mbm_local_enabled())
+ list_add_tail(&mbm_local_event.list, &r->evt_list);

Confused. This hooks all monitoring features to RDT_RESOURCE_L3. Why?

They are really L3 resource events as per the spec.
CPUID.(EAX=0FH, ECX=0):EDX.L3[bit 1] = 1 if L3 monitoring and we query for all the llc_occupancy, l3 total and local b/w with the same resource id 1.