forked from luck/tmp_suning_uos_patched
powerpc: Add timer, performance monitor and machine check counts to /proc/interrupts
With NO_HZ it is useful to know how often the decrementer is going off. The patch below adds an entry for it and also adds it into the /proc/stat summaries. While here, I added performance monitoring and machine check exceptions. I found it useful to keep an eye on the PMU exception rate when using the perf tool. Since it's possible to take a completely handled machine check on a System p box it also sounds like a good idea to keep a machine check summary. The event naming matches x86 to keep gratuitous differences to a minimum. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -6,6 +6,9 @@
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typedef struct {
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unsigned int __softirq_pending;
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unsigned int timer_irqs;
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unsigned int pmu_irqs;
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unsigned int mce_exceptions;
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} ____cacheline_aligned irq_cpustat_t;
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DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
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@ -19,4 +22,10 @@ static inline void ack_bad_irq(unsigned int irq)
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printk(KERN_CRIT "unexpected IRQ trap at vector %02x\n", irq);
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}
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extern u64 arch_irq_stat_cpu(unsigned int cpu);
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#define arch_irq_stat_cpu arch_irq_stat_cpu
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extern u64 arch_irq_stat(void);
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#define arch_irq_stat arch_irq_stat
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#endif /* _ASM_POWERPC_HARDIRQ_H */
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@ -196,6 +196,21 @@ static int show_other_interrupts(struct seq_file *p, int prec)
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}
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#endif /* CONFIG_PPC32 && CONFIG_TAU_INT */
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seq_printf(p, "%*s: ", prec, "LOC");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs);
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seq_printf(p, " Local timer interrupts\n");
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seq_printf(p, "%*s: ", prec, "CNT");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs);
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seq_printf(p, " Performance monitoring interrupts\n");
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seq_printf(p, "%*s: ", prec, "MCE");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
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seq_printf(p, " Machine check exceptions\n");
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seq_printf(p, "%*s: %10u\n", prec, "BAD", ppc_spurious_interrupts);
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return 0;
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@ -258,6 +273,26 @@ int show_interrupts(struct seq_file *p, void *v)
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return 0;
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}
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/*
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* /proc/stat helpers
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*/
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u64 arch_irq_stat_cpu(unsigned int cpu)
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{
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u64 sum = per_cpu(irq_stat, cpu).timer_irqs;
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sum += per_cpu(irq_stat, cpu).pmu_irqs;
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sum += per_cpu(irq_stat, cpu).mce_exceptions;
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return sum;
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}
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u64 arch_irq_stat(void)
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{
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u64 sum = ppc_spurious_interrupts;
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return sum;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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void fixup_irqs(cpumask_t map)
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{
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@ -575,6 +575,8 @@ void timer_interrupt(struct pt_regs * regs)
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trace_timer_interrupt_entry(regs);
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__get_cpu_var(irq_stat).timer_irqs++;
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/* Ensure a positive value is written to the decrementer, or else
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* some CPUs will continuue to take decrementer exceptions */
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set_dec(DECREMENTER_MAX);
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@ -483,6 +483,8 @@ void machine_check_exception(struct pt_regs *regs)
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{
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int recover = 0;
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__get_cpu_var(irq_stat).mce_exceptions++;
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/* See if any machine dependent calls. In theory, we would want
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* to call the CPU first, and call the ppc_md. one if the CPU
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* one returns a positive number. However there is existing code
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@ -965,6 +967,8 @@ void vsx_unavailable_exception(struct pt_regs *regs)
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void performance_monitor_exception(struct pt_regs *regs)
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{
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__get_cpu_var(irq_stat).pmu_irqs++;
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perf_irq(regs);
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}
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