From 096b52fd2bb4996fd68d22b3b7ad21a1296db9d3 Mon Sep 17 00:00:00 2001 From: Sergey Matyukevich Date: Tue, 30 Aug 2022 18:53:06 +0300 Subject: [PATCH] perf: RISC-V: throttle perf events Call perf_sample_event_took() to report time spent in overflow interrupts. Perf core uses these measurements to throttle perf events properly. Signed-off-by: Sergey Matyukevich Reviewed-by: Atish Patra Link: https://lore.kernel.org/r/20220830155306.301714-4-geomatsi@gmail.com Signed-off-by: Palmer Dabbelt --- drivers/perf/riscv_pmu_sbi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index 1d05aff..3e81793 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -570,6 +571,7 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev) unsigned long overflow; unsigned long overflowed_ctrs = 0; struct cpu_hw_events *cpu_hw_evt = dev; + u64 start_clock = sched_clock(); if (WARN_ON_ONCE(!cpu_hw_evt)) return IRQ_NONE; @@ -638,7 +640,9 @@ static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev) perf_event_overflow(event, &data, regs); } } + pmu_sbi_start_overflow_mask(pmu, overflowed_ctrs); + perf_sample_event_took(sched_clock() - start_clock); return IRQ_HANDLED; } -- 2.7.4