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perf: RISC-V: throttle perf events

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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 <sergey.matyukevich@syntacore.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20220830155306.301714-4-geomatsi@gmail.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Sergey Matyukevich 2022-08-30 18:53:06 +03:00 committed by Palmer Dabbelt
parent 1537bf26e2
commit 096b52fd2b
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1 changed files with 4 additions and 0 deletions
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4
drivers/perf/riscv_pmu_sbi.c
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@ -18,6 +18,7 @@
#include <linux/of_irq.h>
#include <linux/of.h>
#include <linux/cpu_pm.h>
#include <linux/sched/clock.h>
#include <asm/sbi.h>
#include <asm/hwcap.h>
@ -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;
}