[patch 03/14] genirq/proc: Utilize irq_desc::tot_count to avoid evaluation

[Thomas Gleixner]

Interrupts which are not marked per CPU increment not only the per CPU
statistics, but also the accumulation counter irq_desc::tot_count.

Change the counter to type unsigned long so it does not produce sporadic
zeros due to wrap arounds on 64-bit machines and do a quick check for non
per CPU interrupts. If the counter is zero, then simply emit a full set of
zero strings. That spares the evaluation of the per CPU counters completely
for interrupts with zero events.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxx>
---
 include/linux/irqdesc.h |    6 +++---
 kernel/irq/proc.c       |   11 ++++++++++-
 2 files changed, 13 insertions(+), 4 deletions(-)

--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -52,8 +52,8 @@ struct irq_redirect {
  * @depth:		disable-depth, for nested irq_disable() calls
  * @wake_depth:		enable depth, for multiple irq_set_irq_wake() callers
  * @tot_count:		stats field for non-percpu irqs
- * @irq_count:		stats field to detect stalled irqs
  * @last_unhandled:	aging timer for unhandled count
+ * @irq_count:		stats field to detect stalled irqs
  * @irqs_unhandled:	stats field for spurious unhandled interrupts
  * @threads_handled:	stats field for deferred spurious detection of threaded handlers
  * @threads_handled_last: comparator field for deferred spurious detection of threaded handlers
@@ -87,9 +87,9 @@ struct irq_desc {
 	unsigned int		core_internal_state__do_not_mess_with_it;
 	unsigned int		depth;		/* nested irq disables */
 	unsigned int		wake_depth;	/* nested wake enables */
-	unsigned int		tot_count;
-	unsigned int		irq_count;	/* For detecting broken IRQs */
+	unsigned long		tot_count;
 	unsigned long		last_unhandled;	/* Aging timer for unhandled count */
+	unsigned int		irq_count;	/* For detecting broken IRQs */
 	unsigned int		irqs_unhandled;
 	atomic_t		threads_handled;
 	int			threads_handled_last;
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -521,7 +521,16 @@ int show_interrupts(struct seq_file *p,
 		return 0;
 
 	seq_printf(p, "%*d:", prec, i);
-	irq_proc_emit_counts(p, &desc->kstat_irqs->cnt);
+
+	/*
+	 * Always output per CPU interrupts. Output device interrupts only when
+	 * desc::tot_count is not zero.
+	 */
+	if (irq_settings_is_per_cpu(desc) || irq_settings_is_per_cpu_devid(desc) ||
+	    data_race(desc->tot_count))
+		irq_proc_emit_counts(p, &desc->kstat_irqs->cnt);
+	else
+		irq_proc_emit_zero_counts(p, num_online_cpus());
 	seq_putc(p, ' ');
 
 	guard(raw_spinlock_irq)(&desc->lock);