[PATCH AUTOSEL 4.4 2/6] sparc: Throttle perf events properly.

[Sasha Levin]

From: "David S. Miller" <da...@davemloft.net>

[ Upstream commit 455adb3174d2c8518cef1a61140c211f6ac224d2 ]

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

Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 arch/sparc/kernel/perf_event.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index a5d0c2f08110..dd02219bcc35 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -23,6 +23,7 @@
 #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>
@@ -1611,6 +1612,8 @@ 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))
@@ -1624,6 +1627,8 @@ 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);
@@ -1662,6 +1667,10 @@ 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;
 }
 
-- 
2.17.1