Commit 455adb31 authored by David S. Miller's avatar David S. Miller
Browse files

sparc: Throttle perf events properly. 



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

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cfdc3170

arch/sparc/kernel/perf_event.c

+9 −0
Original line number Diff line number Diff line
@@ -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;

}