From: Tero Kristo Date: Tue, 12 Sep 2023 12:44:31 +0000 (+0300) Subject: perf/x86/cstate: Allow reading the package statistics from local CPU X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=05276d4831fe023b6674a72bd6b8c5b39796e690;p=linux.git perf/x86/cstate: Allow reading the package statistics from local 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. Suggested-by: Kan Liang Signed-off-by: Tero Kristo Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20230912124432.3616761-2-tero.kristo@linux.intel.com --- diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c index 96fffb2d521d2..cbeb6d2bf5b45 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));