--- /dev/null
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--- /dev/null
+/*
+ * This file is part of stability-monitor-kmod-rpi3
+ *
+ * Copyright © 2019 Samsung Electronics
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/sched.h>
+#include <linux/sched/signal.h>
+#include <linux/sched/cputime.h>
+#include <linux/mm.h>
+#include <linux/pid_namespace.h>
+#include <asm/uaccess.h>
+#include <linux/time.h>
+#include <linux/posix-timers.h>
+#include <linux/kernel_stat.h>
+#include <linux/fdtable.h>
+#include <linux/math64.h>
+#include <linux/task_io_accounting_ops.h>
+
+#define DEBUG 0
+#define PAGE_TO_KB(x) ((x) << (PAGE_SHIFT - 10))
+
+static struct proc_dir_entry* proc_file;
+
+
+static u64 time_now(void)
+{
+ return div64_ul(ktime_get_boot_ns(), NSEC_PER_USEC);
+}
+
+static inline u64 cputime_to_usecs(const u64 cputime)
+{
+ // return cputime >> 12;
+ return div64_ul(cputime, NSEC_PER_USEC);
+}
+
+static unsigned int count_open_files(struct files_struct *files)
+{
+ unsigned int open_files = 0;
+ int i;
+ struct fdtable *fdt;
+
+ if (!files)
+ return 0;
+
+ spin_lock(&files->file_lock);
+ fdt = files_fdtable(files);
+
+ /* Find the last non zero cell in open fds array */
+ for (i = fdt->max_fds / BITS_PER_LONG - 1; i >= 0; i--) {
+ if (fdt->open_fds[i])
+ break;
+ }
+
+ /* Count set bits */
+ for (i = (i + 1) * BITS_PER_LONG - 1; i >= 0; i--) {
+ if(test_bit(i, fdt->open_fds))
+ open_files++;
+ }
+
+ spin_unlock(&files->file_lock);
+ return open_files;
+}
+
+static int stability_monitor_show(struct seq_file *m, void *v)
+{
+ struct sysinfo info;
+ struct task_struct *task, *t;
+ struct pid *pid = NULL;
+ pid_t ppid = 0;
+ u64 uptime, utime, stime, ut, st;
+ unsigned long long vm_rss, total_ram;
+ struct task_io_accounting task_ioac;
+ unsigned int open_fds;
+
+ rcu_read_lock();
+
+ /* Uptime in us */
+ uptime = time_now();
+
+ /* Memory info */
+ si_meminfo(&info);
+ total_ram = PAGE_TO_KB(info.totalram);
+
+ seq_put_decimal_ull(m, "", uptime);
+ seq_put_decimal_ull(m, " ", total_ram);
+ seq_printf(m, "\n");
+
+ for_each_process(task) {
+ ppid = task->real_parent->pid;
+ pid = task_pgrp(task);
+ if (!pid)
+ continue;
+
+ task_lock(task);
+
+ if (!task->mm) {
+ task_unlock(task);
+ continue;
+ }
+
+ if (task->flags & (PF_DUMPCORE|PF_SIGNALED|PF_EXITING)) {
+ task_unlock(task);
+ continue;
+ }
+
+
+ /* Memory */
+ vm_rss = get_mm_rss(task->mm);
+
+ /* Open FDs */
+ open_fds = count_open_files(task->files);
+
+ /* CPU time + IO accounting */
+ task_cputime_adjusted(task, &utime, &stime);
+ task_ioac = task->ioac;
+ t = task;
+ while_each_thread(task, t) {
+ task_cputime_adjusted(t, &ut, &st);
+ utime += ut;
+ stime += st;
+ task_io_accounting_add(&task_ioac, &t->ioac);
+ }
+
+ task_unlock(task);
+
+ seq_put_decimal_ll(m, "", task->pid);
+ seq_put_decimal_ll(m, " ", ppid);
+ seq_put_decimal_ull(m, " ", cputime_to_usecs(utime + stime));
+ seq_put_decimal_ull(m, " ", PAGE_TO_KB(vm_rss));
+ seq_put_decimal_ll(m, " ", open_fds);
+ seq_put_decimal_ull(m, " ", task_ioac.read_bytes + task_ioac.write_bytes);
+ seq_printf(m, "\n");
+ }
+
+ rcu_read_unlock();
+
+#if DEBUG
+ printk(KERN_DEBUG "stability_monitor_show() took %llu us\n", time_now() - uptime);
+#endif
+
+ return 0;
+}
+
+static int stability_monitor_open(struct inode *inode, struct file *file)
+{
+ return single_open_size(file, stability_monitor_show, NULL, 8192);
+}
+
+static const struct file_operations stability_monitor_fops = {
+ .owner = THIS_MODULE,
+ .open = stability_monitor_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init stability_monitor_init(void)
+{
+ proc_file = proc_create("tsm", 0, NULL, &stability_monitor_fops);
+ if (!proc_file)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void __exit stability_monitor_exit(void)
+{
+ remove_proc_entry("tsm", NULL);
+}
+
+module_init(stability_monitor_init);
+module_exit(stability_monitor_exit);
+
+MODULE_LICENSE("GPL");