x86, perfcounters: print out the ->used bitmask

Impact: extend debug printouts

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 74090a393a7c..f3359c2b3910 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -255,6 +255,7 @@ static int pmc_generic_enable(struct perf_counter *counter)
                 idx = find_first_zero_bit(cpuc->used, nr_counters_generic);
                 if (idx == nr_counters_generic)
                         return -EAGAIN;
+
                 set_bit(idx, cpuc->used);
                 hwc->idx = idx;
         }
@@ -274,6 +275,7 @@ static int pmc_generic_enable(struct perf_counter *counter)
 void perf_counter_print_debug(void)
 {
         u64 ctrl, status, overflow, pmc_ctrl, pmc_count, prev_left;
+        struct cpu_hw_counters *cpuc;
         int cpu, idx;
 
         if (!nr_counters_generic)
@@ -282,6 +284,7 @@ void perf_counter_print_debug(void)
         local_irq_disable();
 
         cpu = smp_processor_id();
+        cpuc = &per_cpu(cpu_hw_counters, cpu);
 
         rdmsrl(MSR_CORE_PERF_GLOBAL_CTRL, ctrl);
         rdmsrl(MSR_CORE_PERF_GLOBAL_STATUS, status);
@@ -291,6 +294,7 @@ void perf_counter_print_debug(void)
         printk(KERN_INFO "CPU#%d: ctrl:       %016llx\n", cpu, ctrl);
         printk(KERN_INFO "CPU#%d: status:     %016llx\n", cpu, status);
         printk(KERN_INFO "CPU#%d: overflow:   %016llx\n", cpu, overflow);
+        printk(KERN_INFO "CPU#%d: used:       %016llx\n", cpu, *(u64 *)cpuc->used);
 
         for (idx = 0; idx < nr_counters_generic; idx++) {
                 rdmsrl(MSR_ARCH_PERFMON_EVENTSEL0 + idx, pmc_ctrl);