perf_counter: Generic per counter interrupt throttle

[mv-sheeva.git] / arch / x86 / kernel / cpu / perf_counter.c

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 8c8177f859fe145488f8633025bc31dbf2b2cef2..c4b543d1a86fe4dbd60cb1c040250ad0eec5e8bd 100644 (file)
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -623,6 +623,18 @@ try_generic:
        return 0;
 }
 
+static void x86_pmu_unthrottle(struct perf_counter *counter)
+{
+       struct cpu_hw_counters *cpuc = &__get_cpu_var(cpu_hw_counters);
+       struct hw_perf_counter *hwc = &counter->hw;
+
+       if (WARN_ON_ONCE(hwc->idx >= X86_PMC_IDX_MAX ||
+                               cpuc->counters[hwc->idx] != counter))
+               return;
+
+       x86_pmu.enable(hwc, hwc->idx);
+}
+
 void perf_counter_print_debug(void)
 {
        u64 ctrl, status, overflow, pmc_ctrl, pmc_count, prev_left, fixed;
@@ -1038,6 +1050,7 @@ static const struct pmu pmu = {
        .enable         = x86_pmu_enable,
        .disable        = x86_pmu_disable,
        .read           = x86_pmu_read,
+       .unthrottle     = x86_pmu_unthrottle,
 };
 
 const struct pmu *hw_perf_counter_init(struct perf_counter *counter)