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Subject[PATCH 3/3] Modified generic show_interrupts to display per-CPU interrupts information
Date

Signed-off-by: Sasikantha babu <sasikanth.v19@gmail.com>
---
kernel/irq/proc.c | 39 ++++++++++++++++++++++++++++++---------
1 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 4bd4faa..bc5eaeb 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -410,6 +410,10 @@ int __weak arch_show_interrupts(struct seq_file *p, int prec)
{
return 0;
}
+int __weak arch_show_interrupts_cpu (struct seq_file *p, int prec, int cpu)
+{
+ return 0;
+}

#ifndef ACTUAL_NR_IRQS
# define ACTUAL_NR_IRQS nr_irqs
@@ -423,12 +427,20 @@ int show_interrupts(struct seq_file *p, void *v)
int i = *(loff_t *) v, j;
struct irqaction *action;
struct irq_desc *desc;
-
+ int cpu = -1;
+
if (i > ACTUAL_NR_IRQS)
return 0;

- if (i == ACTUAL_NR_IRQS)
- return arch_show_interrupts(p, prec);
+ if (p->private)
+ cpu += (int) p->private;
+
+ if (i == ACTUAL_NR_IRQS) {
+ if (cpu < 0)
+ return arch_show_interrupts (p, prec);
+ else
+ return arch_show_interrupts_cpu (p, prec, cpu);
+ }

/* print header and calculate the width of the first column */
if (i == 0) {
@@ -436,8 +448,11 @@ int show_interrupts(struct seq_file *p, void *v)
j *= 10;

seq_printf(p, "%*s", prec + 8, "");
- for_each_online_cpu(j)
- seq_printf(p, "CPU%-8d", j);
+ if (cpu < 0) {
+ for_each_online_cpu(j)
+ seq_printf(p, "CPU%-8d", j);
+ } else
+ seq_printf(p, "CPU%-8d", cpu);
seq_putc(p, '\n');
}

@@ -446,15 +461,21 @@ int show_interrupts(struct seq_file *p, void *v)
return 0;

raw_spin_lock_irqsave(&desc->lock, flags);
- for_each_online_cpu(j)
- any_count |= kstat_irqs_cpu(i, j);
+ if (cpu < 0) {
+ for_each_online_cpu(j)
+ any_count |= kstat_irqs_cpu(i, j);
+ } else
+ any_count |= kstat_irqs_cpu(i, cpu);
action = desc->action;
if (!action && !any_count)
goto out;

seq_printf(p, "%*d: ", prec, i);
- for_each_online_cpu(j)
- seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
+ if (cpu < 0) {
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
+ } else
+ seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu));

if (desc->irq_data.chip) {
if (desc->irq_data.chip->irq_print_chip)
--
1.7.3.4


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