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Date: Fri, 17 Oct 2008 16:39:58 +0400
From: Alexey Dobriyan <adobriyan@...il.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 01/31] proc: switch /proc/loadavg to seq_file
>From bbcdd0fc20fa0d13983f3d4ffb7e5e98c12d2791 Mon Sep 17 00:00:00 2001
From: Alexey Dobriyan <adobriyan@...il.com>
Date: Fri, 3 Oct 2008 02:21:47 +0400
Subject: [PATCH 01/31] proc: switch /proc/loadavg to seq_file
and move it to fs/proc/loadavg.c while I'm at it.
Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---
fs/proc/Makefile | 2 +-
fs/proc/loadavg.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
fs/proc/proc_misc.c | 26 --------------------------
3 files changed, 52 insertions(+), 27 deletions(-)
create mode 100644 fs/proc/loadavg.c
diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index ebaba02..bf2ab4d 100644
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -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
diff --git a/fs/proc/loadavg.c b/fs/proc/loadavg.c
new file mode 100644
index 0000000..9bca39c
--- /dev/null
+++ b/fs/proc/loadavg.c
@@ -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);
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 59ea42e..67bbab8 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -56,8 +56,6 @@
#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
@@ -79,29 +77,6 @@ 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)
{
@@ -842,7 +817,6 @@ 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},
--
1.5.6.5
--
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