[PATCH] Powerpc/perf: Wire up PMI throttling

[Ravi Bangoria]

Commit 14c63f17b1fde ("perf: Drop sample rate when sampling is too
slow") introduced a way to throttle PMU interrupts if we're spending
too much time just processing those. Wire up powerpc PMI handler to
use this infrastructure.

Signed-off-by: Ravi Bangoria <ravi.bangoria at linux.ibm.com>
---
 arch/powerpc/kernel/traps.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 9a86572db1ef..44f85fa22356 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -18,6 +18,7 @@
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/sched/debug.h>
+#include <linux/sched/clock.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/pkeys.h>
@@ -1803,9 +1804,12 @@ void vsx_unavailable_tm(struct pt_regs *regs)
 
 void performance_monitor_exception(struct pt_regs *regs)
 {
+	u64 start_clock;
 	__this_cpu_inc(irq_stat.pmu_irqs);
 
+	start_clock = sched_clock();
 	perf_irq(regs);
+	perf_sample_event_took(sched_clock() - start_clock);
 }
 
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
-- 
2.19.1