sparc: Throttle perf events properly.

[ Upstream commit 455adb3174d2c8518cef1a61140c211f6ac224d2 ]

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

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index 8a569b0..eceb021 100644 (file)
--- 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;
 }