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proc: switch /proc/loadavg to seq_file

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and move it to fs/proc/loadavg.c while I'm at it.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
This commit is contained in:
Alexey Dobriyan 2008-10-03 02:21:47 +04:00
parent 6c2f91e077
commit 5b3acc8de8
3 changed files with 52 additions and 27 deletions
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2
fs/proc/Makefile
View file

@ -9,7 +9,7 @@ proc-$(CONFIG_MMU) := mmu.o task_mmu.o
proc-y += inode.o root.o base.o generic.o array.o \
proc_tty.o proc_misc.o
proc-y += loadavg.o
proc-$(CONFIG_PROC_SYSCTL) += proc_sysctl.o
proc-$(CONFIG_NET) += proc_net.o
proc-$(CONFIG_PROC_KCORE) += kcore.o

51
fs/proc/loadavg.c Normal file
View file

@ -0,0 +1,51 @@
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/pid_namespace.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/seqlock.h>
#include <linux/time.h>
#define LOAD_INT(x) ((x) >> FSHIFT)
#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
static int loadavg_proc_show(struct seq_file *m, void *v)
{
int a, b, c;
unsigned long seq;
do {
seq = read_seqbegin(&xtime_lock);
a = avenrun[0] + (FIXED_1/200);
b = avenrun[1] + (FIXED_1/200);
c = avenrun[2] + (FIXED_1/200);
} while (read_seqretry(&xtime_lock, seq));
seq_printf(m, "%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
LOAD_INT(a), LOAD_FRAC(a),
LOAD_INT(b), LOAD_FRAC(b),
LOAD_INT(c), LOAD_FRAC(c),
nr_running(), nr_threads,
task_active_pid_ns(current)->last_pid);
return 0;
}
static int loadavg_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, loadavg_proc_show, NULL);
}
static const struct file_operations loadavg_proc_fops = {
.open = loadavg_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init proc_loadavg_init(void)
{
proc_create("loadavg", 0, NULL, &loadavg_proc_fops);
return 0;
}
module_init(proc_loadavg_init);

26
fs/proc/proc_misc.c
View file

@ -57,8 +57,6 @@
#include <asm/div64.h>
#include "internal.h"
#define LOAD_INT(x) ((x) >> FSHIFT)
#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
/*
* Warning: stuff below (imported functions) assumes that its output will fit
* into one page. For some of those functions it may be wrong. Moreover, we
@ -80,29 +78,6 @@ static int proc_calc_metrics(char *page, char **start, off_t off,
return len;
}
static int loadavg_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int a, b, c;
int len;
unsigned long seq;
do {
seq = read_seqbegin(&xtime_lock);
a = avenrun[0] + (FIXED_1/200);
b = avenrun[1] + (FIXED_1/200);
c = avenrun[2] + (FIXED_1/200);
} while (read_seqretry(&xtime_lock, seq));
len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
LOAD_INT(a), LOAD_FRAC(a),
LOAD_INT(b), LOAD_FRAC(b),
LOAD_INT(c), LOAD_FRAC(c),
nr_running(), nr_threads,
task_active_pid_ns(current)->last_pid);
return proc_calc_metrics(page, start, off, count, eof, len);
}
static int uptime_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
@ -861,7 +836,6 @@ void __init proc_misc_init(void)
char *name;
int (*read_proc)(char*,char**,off_t,int,int*,void*);
} *p, simple_ones[] = {
{"loadavg", loadavg_read_proc},
{"uptime", uptime_read_proc},
{"meminfo", meminfo_read_proc},
{"version", version_read_proc},