[PATCH V4 16/23] perf/x86/intel: Set correct weight for topdown subevent counters

kan.liang
2019-03-26T16:12:26Z

From: Andi Kleen <ak@linux.intel.com>

The top down sub event counters are mapped to a fixed counter,
but should have the normal weight for the scheduler.
So special case this.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---

No changes since V3.

arch/x86/events/intel/core.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 6a8a221dc188..31e4e283e7c5 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -5081,6 +5081,15 @@ __init int intel_pmu_init(void)
* counter, so do not extend mask to generic counters
*/
for_each_event_constraint(c, x86_pmu.event_constraints) {
+ /*
+ * Don't limit the event mask for topdown sub event
+ * counters.
+ */
+ if (x86_pmu.num_counters_fixed >= 3 &&
+ c->idxmsk64 & INTEL_PMC_MSK_ANY_SLOTS) {
+ c->weight = hweight64(c->idxmsk64);
+ continue;
+ }
if (c->cmask == FIXED_EVENT_FLAGS
&& c->idxmsk64 != INTEL_PMC_MSK_FIXED_REF_CYCLES) {
c->idxmsk64 |= (1ULL << x86_pmu.num_counters) - 1;
--
2.17.1