parisc: more irq statistics in /proc/interrupts
Add framework and initial values for more fine grained statistics in
/proc/interrupts.
Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index 810f9cf8..a237e32 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -152,6 +152,40 @@
.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 @@
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
+ if (i == NR_IRQS)
+ arch_show_interrupts(p, 3);
+
return 0;
}
@@ -340,13 +377,22 @@
/* 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 "