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proc: export statistics for softirq to /proc

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Export statistics for softirq in /proc/softirqs and /proc/stat.

1. /proc/softirqs
Implement /proc/softirqs which shows the number of softirq
for each CPU like /proc/interrupts.

2. /proc/stat
Add the "softirq" line to /proc/stat.
This line shows the number of softirq for all cpu.
The first column is the total of all softirqs and
each subsequent column is the total for particular softirq.

[kosaki.motohiro@jp.fujitsu.com: remove redundant for_each_possible_cpu() loop]
Signed-off-by: Keika Kobayashi <kobayashi.kk@ncos.nec.co.jp>
Reviewed-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Eric Dumazet <dada1@cosmosbay.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Keika Kobayashi 2009-06-17 16:25:55 -07:00 committed by Linus Torvalds
parent 9d9b8fb0e5
commit d3d64df21d
4 changed files with 86 additions and 0 deletions
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26
Documentation/filesystems/proc.txt
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@ -283,6 +283,7 @@ Table 1-4: Kernel info in /proc
rtc Real time clock
scsi SCSI info (see text)
slabinfo Slab pool info
softirqs softirq usage
stat Overall statistics
swaps Swap space utilization
sys See chapter 2
@ -597,6 +598,25 @@ on the kind of area :
0xffffffffa0017000-0xffffffffa0022000 45056 sys_init_module+0xc27/0x1d00 ...
pages=10 vmalloc N0=10
..............................................................................
softirqs:
Provides counts of softirq handlers serviced since boot time, for each cpu.
> cat /proc/softirqs
CPU0 CPU1 CPU2 CPU3
HI: 0 0 0 0
TIMER: 27166 27120 27097 27034
NET_TX: 0 0 0 17
NET_RX: 42 0 0 39
BLOCK: 0 0 107 1121
TASKLET: 0 0 0 290
SCHED: 27035 26983 26971 26746
HRTIMER: 0 0 0 0
RCU: 1678 1769 2178 2250
1.3 IDE devices in /proc/ide
----------------------------
@ -883,6 +903,7 @@ since the system first booted. For a quick look, simply cat the file:
processes 2915
procs_running 1
procs_blocked 0
softirq 183433 0 21755 12 39 1137 231 21459 2263
The very first "cpu" line aggregates the numbers in all of the other "cpuN"
lines. These numbers identify the amount of time the CPU has spent performing
@ -918,6 +939,11 @@ CPUs.
The "procs_blocked" line gives the number of processes currently blocked,
waiting for I/O to complete.
The "softirq" line gives counts of softirqs serviced since boot time, for each
of the possible system softirqs. The first column is the total of all
softirqs serviced; each subsequent column is the total for that particular
softirq.
1.9 Ext4 file system parameters
------------------------------

1
fs/proc/Makefile
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@ -18,6 +18,7 @@ proc-y += meminfo.o
proc-y += stat.o
proc-y += uptime.o
proc-y += version.o
proc-y += softirqs.o
proc-$(CONFIG_PROC_SYSCTL) += proc_sysctl.o
proc-$(CONFIG_NET) += proc_net.o
proc-$(CONFIG_PROC_KCORE) += kcore.o

44
fs/proc/softirqs.c Normal file
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@ -0,0 +1,44 @@
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
/*
* /proc/softirqs ... display the number of softirqs
*/
static int show_softirqs(struct seq_file *p, void *v)
{
int i, j;
seq_printf(p, " ");
for_each_possible_cpu(i)
seq_printf(p, "CPU%-8d", i);
seq_printf(p, "\n");
for (i = 0; i < NR_SOFTIRQS; i++) {
seq_printf(p, "%8s:", softirq_to_name[i]);
for_each_possible_cpu(j)
seq_printf(p, " %10u", kstat_softirqs_cpu(i, j));
seq_printf(p, "\n");
}
return 0;
}
static int softirqs_open(struct inode *inode, struct file *file)
{
return single_open(file, show_softirqs, NULL);
}
static const struct file_operations proc_softirqs_operations = {
.open = softirqs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init proc_softirqs_init(void)
{
proc_create("softirqs", 0, NULL, &proc_softirqs_operations);
return 0;
}
module_init(proc_softirqs_init);

15
fs/proc/stat.c
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@ -29,6 +29,8 @@ static int show_stat(struct seq_file *p, void *v)
cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
cputime64_t guest;
u64 sum = 0;
u64 sum_softirq = 0;
unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
struct timespec boottime;
unsigned int per_irq_sum;
@ -53,6 +55,13 @@ static int show_stat(struct seq_file *p, void *v)
sum += kstat_irqs_cpu(j, i);
}
sum += arch_irq_stat_cpu(i);
for (j = 0; j < NR_SOFTIRQS; j++) {
unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
per_softirq_sums[j] += softirq_stat;
sum_softirq += softirq_stat;
}
}
sum += arch_irq_stat();
@ -115,6 +124,12 @@ static int show_stat(struct seq_file *p, void *v)
nr_running(),
nr_iowait());
seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
for (i = 0; i < NR_SOFTIRQS; i++)
seq_printf(p, " %u", per_softirq_sums[i]);
seq_printf(p, "\n");
return 0;
}