| Message ID | 20230823055653.2964237-2-tero.kristo@linux.intel.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | BPF |
| Headers | show |
| Series | perf/x86: Package residency counter improvements | expand |
| Context | Check | Description |
|---|---|---|
| netdev/tree_selection | success | Not a local patch |
diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c index 835862c548cc..5cfe021edc65 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));
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(+)