diff options
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/Kconfig | 4 | ||||
| -rw-r--r-- | kernel/irq/irqdesc.c | 25 |
2 files changed, 29 insertions, 0 deletions
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 2531f3496ab6..529adb1f5859 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -108,6 +108,10 @@ config GENERIC_IRQ_MATRIX_ALLOCATOR config GENERIC_IRQ_RESERVATION_MODE bool +# Snapshot for interrupt statistics +config GENERIC_IRQ_STAT_SNAPSHOT + bool + # Support forced irq threading config IRQ_FORCED_THREADING bool diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index b59b79200ad7..f348faffa7b4 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -994,6 +994,31 @@ static unsigned int kstat_irqs(unsigned int irq) return sum; } +#ifdef CONFIG_GENERIC_IRQ_STAT_SNAPSHOT + +void kstat_snapshot_irqs(void) +{ + struct irq_desc *desc; + unsigned int irq; + + for_each_irq_desc(irq, desc) { + if (!desc->kstat_irqs) + continue; + this_cpu_write(desc->kstat_irqs->ref, this_cpu_read(desc->kstat_irqs->cnt)); + } +} + +unsigned int kstat_get_irq_since_snapshot(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + + if (!desc || !desc->kstat_irqs) + return 0; + return this_cpu_read(desc->kstat_irqs->cnt) - this_cpu_read(desc->kstat_irqs->ref); +} + +#endif + /** * kstat_irqs_usr - Get the statistics for an interrupt from thread context * @irq: The interrupt number |