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authorAlexey Dobriyan <adobriyan@gmail.com>2008-10-03 02:21:47 +0400
committerAlexey Dobriyan <adobriyan@gmail.com>2008-10-23 13:45:28 +0400
commit5b3acc8de8b2bc459afae6e09ada45c7e5b11bbf (patch)
tree295a8d4401fb63e7c0f32090f1fafce1835765d6 /fs/proc/loadavg.c
parent6c2f91e077f1b60e7f83b7ee044f965f469cfdb3 (diff)
downloadop-kernel-dev-5b3acc8de8b2bc459afae6e09ada45c7e5b11bbf.zip
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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@gmail.com>
Diffstat (limited to 'fs/proc/loadavg.c')
-rw-r--r--fs/proc/loadavg.c51
1 files changed, 51 insertions, 0 deletions
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);
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