diff mbox series

[RESEND,1/2] perf/x86/cstate: Allow reading the package statistics from local CPU

Message ID 20230912124432.3616761-2-tero.kristo@linux.intel.com
State New
Headers
Series perf/x86: Package residency counter improvements |

Commit Message

Tero Kristo Sept. 12, 2023, 12:44 p.m. UTC 
  The MSR registers for reading the package residency counters are
available on every CPU of the package. To avoid doing unnecessary SMP
calls to read the values for these from the various CPUs inside a
package, allow reading them from any CPU of the package.

Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Suggested-by: Kan Liang <kan.liang@intel.com>
---
 arch/x86/events/intel/cstate.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index 96fffb2d521d..cbeb6d2bf5b4 100644
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -336,6 +336,9 @@  static int cstate_pmu_event_init(struct perf_event *event)
 		cfg = array_index_nospec((unsigned long)cfg, PERF_CSTATE_PKG_EVENT_MAX);
 		if (!(pkg_msr_mask & (1 << cfg)))
 			return -EINVAL;
+
+		event->event_caps |= PERF_EV_CAP_READ_ACTIVE_PKG;
+
 		event->hw.event_base = pkg_msr[cfg].msr;
 		cpu = cpumask_any_and(&cstate_pkg_cpu_mask,
 				      topology_die_cpumask(event->cpu));