genirq: Avoid summation loops for /proc/interrupts
show_interrupts() unconditionally accumulates the per CPU interrupt statistics to determine whether an interrupt was ever raised. This can be avoided for all interrupts which are not strictly per CPU and not of type NMI because those interrupts provide already an accumulated counter. The required logic is already implemented in kstat_irqs(). Split the inner access logic out of kstat_irqs() and use it for kstat_irqs() and show_interrupts() to avoid the accumulation loop when possible. Originally-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Bitao Hu <yaoma@linux.alibaba.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Liu Song <liusong@linux.alibaba.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20240411074134.30922-4-yaoma@linux.alibaba.com
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@ -98,6 +98,8 @@ extern void mask_irq(struct irq_desc *desc);
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extern void unmask_irq(struct irq_desc *desc);
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extern void unmask_threaded_irq(struct irq_desc *desc);
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extern unsigned int kstat_irqs_desc(struct irq_desc *desc, const struct cpumask *cpumask);
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#ifdef CONFIG_SPARSE_IRQ
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static inline void irq_mark_irq(unsigned int irq) { }
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#else
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@ -976,24 +976,30 @@ static bool irq_is_nmi(struct irq_desc *desc)
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return desc->istate & IRQS_NMI;
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}
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static unsigned int kstat_irqs(unsigned int irq)
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unsigned int kstat_irqs_desc(struct irq_desc *desc, const struct cpumask *cpumask)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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unsigned int sum = 0;
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int cpu;
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if (!desc || !desc->kstat_irqs)
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return 0;
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if (!irq_settings_is_per_cpu_devid(desc) &&
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!irq_settings_is_per_cpu(desc) &&
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!irq_is_nmi(desc))
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return data_race(desc->tot_count);
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for_each_possible_cpu(cpu)
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for_each_cpu(cpu, cpumask)
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sum += data_race(per_cpu(desc->kstat_irqs->cnt, cpu));
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return sum;
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}
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static unsigned int kstat_irqs(unsigned int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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if (!desc || !desc->kstat_irqs)
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return 0;
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return kstat_irqs_desc(desc, cpu_possible_mask);
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}
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#ifdef CONFIG_GENERIC_IRQ_STAT_SNAPSHOT
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void kstat_snapshot_irqs(void)
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@ -488,10 +488,8 @@ int show_interrupts(struct seq_file *p, void *v)
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if (!desc || irq_settings_is_hidden(desc))
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goto outsparse;
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if (desc->kstat_irqs) {
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for_each_online_cpu(j)
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any_count |= data_race(per_cpu(desc->kstat_irqs->cnt, j));
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}
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if (desc->kstat_irqs)
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any_count = kstat_irqs_desc(desc, cpu_online_mask);
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if ((!desc->action || irq_desc_is_chained(desc)) && !any_count)
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goto outsparse;
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