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parisc: more irq statistics in /proc/interrupts

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Add framework and initial values for more fine grained statistics in
/proc/interrupts.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
2013-05-06 19:20:26 +00:00
parent 200c880420
commit cd85d5514d
5 changed files with 86 additions and 4 deletions
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48
arch/parisc/kernel/irq.c
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@@ -152,6 +152,40 @@ static struct irq_chip cpu_interrupt_type = {
.irq_retrigger = NULL,
};
DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
#define irq_stats(x) (&per_cpu(irq_stat, x))
/*
* /proc/interrupts printing for arch specific interrupts
*/
int arch_show_interrupts(struct seq_file *p, int prec)
{
int j;
#ifdef CONFIG_DEBUG_STACKOVERFLOW
seq_printf(p, "%*s: ", prec, "STK");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->kernel_stack_usage);
seq_printf(p, " Kernel stack usage\n");
#endif
#ifdef CONFIG_SMP
seq_printf(p, "%*s: ", prec, "RES");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
seq_printf(p, " Rescheduling interrupts\n");
seq_printf(p, "%*s: ", prec, "CAL");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->irq_call_count -
irq_stats(j)->irq_tlb_count);
seq_printf(p, " Function call interrupts\n");
seq_printf(p, "%*s: ", prec, "TLB");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
seq_printf(p, " TLB shootdowns\n");
#endif
return 0;
}
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v, j;
@@ -219,6 +253,9 @@ int show_interrupts(struct seq_file *p, void *v)
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
if (i == NR_IRQS)
arch_show_interrupts(p, 3);
return 0;
}
@@ -340,13 +377,22 @@ static inline void stack_overflow_check(struct pt_regs *regs)
/* Our stack starts directly behind the thread_info struct. */
unsigned long stack_start = (unsigned long) current_thread_info();
unsigned long sp = regs->gr[30];
unsigned long stack_usage;
unsigned int *last_usage;
/* if sr7 != 0, we interrupted a userspace process which we do not want
* to check for stack overflow. We will only check the kernel stack. */
if (regs->sr[7])
return;
if (likely((sp - stack_start) < (THREAD_SIZE - STACK_MARGIN)))
/* calculate kernel stack usage */
stack_usage = sp - stack_start;
last_usage = &per_cpu(irq_stat.kernel_stack_usage, smp_processor_id());
if (unlikely(stack_usage > *last_usage))
*last_usage = stack_usage;
if (likely(stack_usage < (THREAD_SIZE - STACK_MARGIN)))
return;
pr_emerg("stackcheck: %s will most likely overflow kernel stack "