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| author |   Ravi Bangoria <ravi.bangoria@linux.ibm.com> | 2018-11-21 09:26:37 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-12-21 11:32:49 +1100 |
| commit | 0c9108b083706330cd5484d121fbb0ad67e8f647 (patch) | |
| tree | 7c7a1dbb8c5a2cc06a764bb3caa8fadde0415a45 /arch/powerpc/perf | |
| parent | powerpc/powernv/eeh/npu: Fix uninitialized variables in opal_pci_eeh_freeze_status (diff) | |
| download | linux-dev-0c9108b083706330cd5484d121fbb0ad67e8f647.tar.xz linux-dev-0c9108b083706330cd5484d121fbb0ad67e8f647.zip | |
Powerpc/perf: Wire up PMI throttling
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.
We have throttling of the *rate* of interrupts, but this adds
throttling based on the *time taken* to process the interrupts.
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/perf')
| -rw-r--r-- | arch/powerpc/perf/core-book3s.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index 383cc3640ac6..b0723002a396 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -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); |