sparc: Throttle perf events properly.

Like x86 and arm, call perf_sample_event_took() in perf event
NMI interrupt handler.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index a4cc26bd89a2..67b3e6b3ce5d 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -24,6 +24,7 @@
 #include <asm/cpudata.h>
 #include <linux/uaccess.h>
 #include <linux/atomic.h>
+#include <linux/sched/clock.h>
 #include <asm/nmi.h>
 #include <asm/pcr.h>
 #include <asm/cacheflush.h>
@@ -1612,6 +1613,8 @@ static int __kprobes perf_event_nmi_handler(struct notifier_block *self,
         struct perf_sample_data data;
         struct cpu_hw_events *cpuc;
         struct pt_regs *regs;
+        u64 finish_clock;
+        u64 start_clock;
         int i;
 
         if (!atomic_read(&active_events))
@@ -1625,6 +1628,8 @@ static int __kprobes perf_event_nmi_handler(struct notifier_block *self,
                 return NOTIFY_DONE;
         }
 
+        start_clock = sched_clock();
+
         regs = args->regs;
 
         cpuc = this_cpu_ptr(&cpu_hw_events);
@@ -1663,6 +1668,10 @@ static int __kprobes perf_event_nmi_handler(struct notifier_block *self,
                         sparc_pmu_stop(event, 0);
         }
 
+        finish_clock = sched_clock();
+
+        perf_sample_event_took(finish_clock - start_clock);
+
         return NOTIFY_STOP;
 }