proc: move /proc/stat to fs/proc/stat.c

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

1 files changed, 153 insertions, 0 deletions

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
new file mode 100644
index 000000000000..81904f07679d
--- /dev/null
+++ b/fs/proc/stat.c
@@ -0,0 +1,153 @@
+#include <linux/cpumask.h>
+#include <linux/fs.h>
+#include <linux/gfp.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <asm/cputime.h>
+
+#ifndef arch_irq_stat_cpu
+#define arch_irq_stat_cpu(cpu) 0
+#endif
+#ifndef arch_irq_stat
+#define arch_irq_stat() 0
+#endif
+
+static int show_stat(struct seq_file *p, void *v)
+{
+        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;
+
+        user = nice = system = idle = iowait =
+                irq = softirq = steal = cputime64_zero;
+        guest = cputime64_zero;
+        getboottime(&boottime);
+        jif = boottime.tv_sec;
+
+        for_each_possible_cpu(i) {
+                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);
+                idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
+                iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
+                irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
+                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_each_irq_nr(j)
+                        sum += kstat_irqs_cpu(j, i);
+
+                sum += arch_irq_stat_cpu(i);
+        }
+        sum += arch_irq_stat();
+
+        seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
+                (unsigned long long)cputime64_to_clock_t(user),
+                (unsigned long long)cputime64_to_clock_t(nice),
+                (unsigned long long)cputime64_to_clock_t(system),
+                (unsigned long long)cputime64_to_clock_t(idle),
+                (unsigned long long)cputime64_to_clock_t(iowait),
+                (unsigned long long)cputime64_to_clock_t(irq),
+                (unsigned long long)cputime64_to_clock_t(softirq),
+                (unsigned long long)cputime64_to_clock_t(steal),
+                (unsigned long long)cputime64_to_clock_t(guest));
+        for_each_online_cpu(i) {
+
+                /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
+                user = kstat_cpu(i).cpustat.user;
+                nice = kstat_cpu(i).cpustat.nice;
+                system = kstat_cpu(i).cpustat.system;
+                idle = kstat_cpu(i).cpustat.idle;
+                iowait = kstat_cpu(i).cpustat.iowait;
+                irq = kstat_cpu(i).cpustat.irq;
+                softirq = kstat_cpu(i).cpustat.softirq;
+                steal = kstat_cpu(i).cpustat.steal;
+                guest = kstat_cpu(i).cpustat.guest;
+                seq_printf(p,
+                        "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
+                        i,
+                        (unsigned long long)cputime64_to_clock_t(user),
+                        (unsigned long long)cputime64_to_clock_t(nice),
+                        (unsigned long long)cputime64_to_clock_t(system),
+                        (unsigned long long)cputime64_to_clock_t(idle),
+                        (unsigned long long)cputime64_to_clock_t(iowait),
+                        (unsigned long long)cputime64_to_clock_t(irq),
+                        (unsigned long long)cputime64_to_clock_t(softirq),
+                        (unsigned long long)cputime64_to_clock_t(steal),
+                        (unsigned long long)cputime64_to_clock_t(guest));
+        }
+        seq_printf(p, "intr %llu", (unsigned long long)sum);
+
+        /* sum again ? it could be updated? */
+        for_each_irq_nr(j) {
+                per_irq_sum = 0;
+
+                for_each_possible_cpu(i)
+                        per_irq_sum += kstat_irqs_cpu(j, i);
+
+                seq_printf(p, " %u", per_irq_sum);
+        }
+
+        seq_printf(p,
+                "\nctxt %llu\n"
+                "btime %lu\n"
+                "processes %lu\n"
+                "procs_running %lu\n"
+                "procs_blocked %lu\n",
+                nr_context_switches(),
+                (unsigned long)jif,
+                total_forks,
+                nr_running(),
+                nr_iowait());
+
+        return 0;
+}
+
+static int stat_open(struct inode *inode, struct file *file)
+{
+        unsigned size = 4096 * (1 + num_possible_cpus() / 32);
+        char *buf;
+        struct seq_file *m;
+        int res;
+
+        /* don't ask for more than the kmalloc() max size, currently 128 KB */
+        if (size > 128 * 1024)
+                size = 128 * 1024;
+        buf = kmalloc(size, GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
+
+        res = single_open(file, show_stat, NULL);
+        if (!res) {
+                m = file->private_data;
+                m->buf = buf;
+                m->size = size;
+        } else
+                kfree(buf);
+        return res;
+}
+
+static const struct file_operations proc_stat_operations = {
+        .open           = stat_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int __init proc_stat_init(void)
+{
+        proc_create("stat", 0, NULL, &proc_stat_operations);
+        return 0;
+}
+module_init(proc_stat_init);