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irq, fs/proc: replace loop with nr_irqs for proc/stat 

Replace another nr_irqs loop to avoid the allocation of all sparse
irq entries - use for_each_irq_desc instead.

v2: make sure arch without GENERIC_HARDIRQS works too

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-08-19 20:50:12 -07:00 committed by Ingo Molnar
parent 2c6927a38f
commit c7fb03a475
2 changed files with 33 additions and 14 deletions
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42
fs/proc/proc_misc.c
View File

@ -30,6 +30,7 @@
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/pagemap.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/swap.h>
#include <linux/slab.h>
@ -501,17 +502,16 @@ static const struct file_operations proc_vmalloc_operations = {
static int show_stat(struct seq_file *p, void *v)
{
int i;
int i, j;
unsigned long jif;
cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
cputime64_t guest;
u64 sum = 0;
struct timespec boottime;
unsigned int *per_irq_sum;
per_irq_sum = kzalloc(sizeof(unsigned int)*nr_irqs, GFP_KERNEL);
if (!per_irq_sum)
return -ENOMEM;
unsigned int per_irq_sum;
#ifdef CONFIG_GENERIC_HARDIRQS
struct irq_desc *desc;
#endif
user = nice = system = idle = iowait =
irq = softirq = steal = cputime64_zero;
@ -520,8 +520,6 @@ static int show_stat(struct seq_file *p, void *v)
jif = boottime.tv_sec;
for_each_possible_cpu(i) {
int j;
user = cputime64_add(user, kstat_cpu(i).cpustat.user);
nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
system = cputime64_add(system, kstat_cpu(i).cpustat.system);
@ -531,10 +529,12 @@ static int show_stat(struct seq_file *p, void *v)
softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
for (j = 0; j < nr_irqs; j++) {
unsigned int temp = kstat_irqs_cpu(j, i);
for_each_irq_desc(j, desc)
{
unsigned int temp;
temp = kstat_irqs_cpu(j, i);
sum += temp;
per_irq_sum[j] += temp;
}
sum += arch_irq_stat_cpu(i);
}
@ -577,8 +577,23 @@ static int show_stat(struct seq_file *p, void *v)
}
seq_printf(p, "intr %llu", (unsigned long long)sum);
for (i = 0; i < nr_irqs; i++)
seq_printf(p, " %u", per_irq_sum[i]);
/* sum again ? it could be updated? */
for_each_irq_desc(j, desc)
{
per_irq_sum = 0;
for_each_possible_cpu(i) {
unsigned int temp;
temp = kstat_irqs_cpu(j, i);
per_irq_sum += temp;
}
#ifdef CONFIG_HAVE_SPARSE_IRQ
seq_printf(p, " %u:%u", j, per_irq_sum);
#else
seq_printf(p, " %u", per_irq_sum);
#endif
}
seq_printf(p,
"\nctxt %llu\n"
@ -592,7 +607,6 @@ static int show_stat(struct seq_file *p, void *v)
nr_running(),
nr_iowait());
kfree(per_irq_sum);
return 0;
}

5
include/linux/interrupt.h
View File

@ -17,6 +17,11 @@
extern int nr_irqs;
#ifndef CONFIG_GENERIC_HARDIRQS
#define for_each_irq_desc(irq, desc) \
for (irq = 0; irq < nr_irqs; irq++)
#endif
/*
* These correspond to the IORESOURCE_IRQ_* defines in
* linux/ioport.h to select the interrupt line behaviour. When