arm: perf: filter unschedulable events

[sfrench/cifs-2.6.git] / arch / arm / kernel / perf_event.c

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 9b536be74f7bbb731cb1c8c56681ca774d8d1f7d..df028072aabf0ccc659fafaa8a057ccf41f1bc5b 100644 (file)
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -524,6 +524,18 @@ static void armpmu_disable(struct pmu *pmu)
        armpmu->stop(armpmu);
 }
 
+/*
+ * In heterogeneous systems, events are specific to a particular
+ * microarchitecture, and aren't suitable for another. Thus, only match CPUs of
+ * the same microarchitecture.
+ */
+static int armpmu_filter_match(struct perf_event *event)
+{
+       struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+       unsigned int cpu = smp_processor_id();
+       return cpumask_test_cpu(cpu, &armpmu->supported_cpus);
+}
+
 #ifdef CONFIG_PM
 static int armpmu_runtime_resume(struct device *dev)
 {
@@ -564,6 +576,7 @@ static void armpmu_init(struct arm_pmu *armpmu)
                .start          = armpmu_start,
                .stop           = armpmu_stop,
                .read           = armpmu_read,
+               .filter_match   = armpmu_filter_match,
        };
 }