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Commit 0c9108b0 authored by Ravi Bangoria's avatar Ravi Bangoria Committed by Michael Ellerman
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Powerpc/perf: Wire up PMI throttling 



Commit 14c63f17 ("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.

We have throttling of the *rate* of interrupts, but this adds
throttling based on the *time taken* to process the interrupts.

Signed-off-by: default avatarRavi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent c2057701

arch/powerpc/perf/core-book3s.c

+10 −1
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
 */

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/sched/clock.h>

#include <linux/perf_event.h>

#include <linux/percpu.h>

#include <linux/hardirq.h>
@@ -2166,7 +2167,7 @@ static bool pmc_overflow(unsigned long val) 
/*

 * Performance monitor interrupt stuff

 */

static void perf_event_interrupt(struct pt_regs *regs)

static void __perf_event_interrupt(struct pt_regs *regs)

{

	int i, j;

	struct cpu_hw_events *cpuhw = this_cpu_ptr(&cpu_hw_events);
@@ -2250,6 +2251,14 @@ static void perf_event_interrupt(struct pt_regs *regs) 
		irq_exit();

}



static void perf_event_interrupt(struct pt_regs *regs)

{

	u64 start_clock = sched_clock();



	__perf_event_interrupt(regs);

	perf_sample_event_took(sched_clock() - start_clock);

}



static int power_pmu_prepare_cpu(unsigned int cpu)

{

	struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu);