| /* drivers/misc/uid_sys_stats.c |
| * |
| * Copyright (C) 2014 - 2015 Google, Inc. |
| * |
| * This software is licensed under the terms of the GNU General Public |
| * License version 2, as published by the Free Software Foundation, and |
| * may be copied, distributed, and modified under those terms. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| #include <linux/atomic.h> |
| #include <linux/cpufreq_times.h> |
| #include <linux/err.h> |
| #include <linux/hashtable.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/list.h> |
| #include <linux/mm.h> |
| #include <linux/proc_fs.h> |
| #include <linux/profile.h> |
| #include <linux/rtmutex.h> |
| #include <linux/sched/cputime.h> |
| #include <linux/seq_file.h> |
| #include <linux/slab.h> |
| #include <linux/uaccess.h> |
| |
| |
| #define UID_HASH_BITS 10 |
| DECLARE_HASHTABLE(hash_table, UID_HASH_BITS); |
| |
| static DEFINE_RT_MUTEX(uid_lock); |
| static struct proc_dir_entry *cpu_parent; |
| static struct proc_dir_entry *io_parent; |
| static struct proc_dir_entry *proc_parent; |
| |
| struct io_stats { |
| u64 read_bytes; |
| u64 write_bytes; |
| u64 rchar; |
| u64 wchar; |
| u64 fsync; |
| }; |
| |
| #define UID_STATE_FOREGROUND 0 |
| #define UID_STATE_BACKGROUND 1 |
| #define UID_STATE_BUCKET_SIZE 2 |
| |
| #define UID_STATE_TOTAL_CURR 2 |
| #define UID_STATE_TOTAL_LAST 3 |
| #define UID_STATE_DEAD_TASKS 4 |
| #define UID_STATE_SIZE 5 |
| |
| #define MAX_TASK_COMM_LEN 256 |
| |
| struct task_entry { |
| char comm[MAX_TASK_COMM_LEN]; |
| pid_t pid; |
| struct io_stats io[UID_STATE_SIZE]; |
| struct hlist_node hash; |
| }; |
| |
| struct uid_entry { |
| uid_t uid; |
| u64 utime; |
| u64 stime; |
| u64 active_utime; |
| u64 active_stime; |
| int state; |
| struct io_stats io[UID_STATE_SIZE]; |
| struct hlist_node hash; |
| #ifdef CONFIG_UID_SYS_STATS_DEBUG |
| DECLARE_HASHTABLE(task_entries, UID_HASH_BITS); |
| #endif |
| }; |
| |
| static u64 compute_write_bytes(struct task_struct *task) |
| { |
| if (task->ioac.write_bytes <= task->ioac.cancelled_write_bytes) |
| return 0; |
| |
| return task->ioac.write_bytes - task->ioac.cancelled_write_bytes; |
| } |
| |
| static void compute_io_bucket_stats(struct io_stats *io_bucket, |
| struct io_stats *io_curr, |
| struct io_stats *io_last, |
| struct io_stats *io_dead) |
| { |
| /* tasks could switch to another uid group, but its io_last in the |
| * previous uid group could still be positive. |
| * therefore before each update, do an overflow check first |
| */ |
| int64_t delta; |
| |
| delta = io_curr->read_bytes + io_dead->read_bytes - |
| io_last->read_bytes; |
| io_bucket->read_bytes += delta > 0 ? delta : 0; |
| delta = io_curr->write_bytes + io_dead->write_bytes - |
| io_last->write_bytes; |
| io_bucket->write_bytes += delta > 0 ? delta : 0; |
| delta = io_curr->rchar + io_dead->rchar - io_last->rchar; |
| io_bucket->rchar += delta > 0 ? delta : 0; |
| delta = io_curr->wchar + io_dead->wchar - io_last->wchar; |
| io_bucket->wchar += delta > 0 ? delta : 0; |
| delta = io_curr->fsync + io_dead->fsync - io_last->fsync; |
| io_bucket->fsync += delta > 0 ? delta : 0; |
| |
| io_last->read_bytes = io_curr->read_bytes; |
| io_last->write_bytes = io_curr->write_bytes; |
| io_last->rchar = io_curr->rchar; |
| io_last->wchar = io_curr->wchar; |
| io_last->fsync = io_curr->fsync; |
| |
| memset(io_dead, 0, sizeof(struct io_stats)); |
| } |
| |
| #ifdef CONFIG_UID_SYS_STATS_DEBUG |
| static void get_full_task_comm(struct task_entry *task_entry, |
| struct task_struct *task) |
| { |
| int i = 0, offset = 0, len = 0; |
| /* save one byte for terminating null character */ |
| int unused_len = MAX_TASK_COMM_LEN - TASK_COMM_LEN - 1; |
| char buf[MAX_TASK_COMM_LEN - TASK_COMM_LEN - 1]; |
| struct mm_struct *mm = task->mm; |
| |
| /* fill the first TASK_COMM_LEN bytes with thread name */ |
| __get_task_comm(task_entry->comm, TASK_COMM_LEN, task); |
| i = strlen(task_entry->comm); |
| while (i < TASK_COMM_LEN) |
| task_entry->comm[i++] = ' '; |
| |
| /* next the executable file name */ |
| if (mm) { |
| down_read(&mm->mmap_sem); |
| if (mm->exe_file) { |
| char *pathname = d_path(&mm->exe_file->f_path, buf, |
| unused_len); |
| |
| if (!IS_ERR(pathname)) { |
| len = strlcpy(task_entry->comm + i, pathname, |
| unused_len); |
| i += len; |
| task_entry->comm[i++] = ' '; |
| unused_len--; |
| } |
| } |
| up_read(&mm->mmap_sem); |
| } |
| unused_len -= len; |
| |
| /* fill the rest with command line argument |
| * replace each null or new line character |
| * between args in argv with whitespace */ |
| len = get_cmdline(task, buf, unused_len); |
| while (offset < len) { |
| if (buf[offset] != '\0' && buf[offset] != '\n') |
| task_entry->comm[i++] = buf[offset]; |
| else |
| task_entry->comm[i++] = ' '; |
| offset++; |
| } |
| |
| /* get rid of trailing whitespaces in case when arg is memset to |
| * zero before being reset in userspace |
| */ |
| while (task_entry->comm[i-1] == ' ') |
| i--; |
| task_entry->comm[i] = '\0'; |
| } |
| |
| static struct task_entry *find_task_entry(struct uid_entry *uid_entry, |
| struct task_struct *task) |
| { |
| struct task_entry *task_entry; |
| |
| hash_for_each_possible(uid_entry->task_entries, task_entry, hash, |
| task->pid) { |
| if (task->pid == task_entry->pid) { |
| /* if thread name changed, update the entire command */ |
| int len = strnchr(task_entry->comm, ' ', TASK_COMM_LEN) |
| - task_entry->comm; |
| |
| if (strncmp(task_entry->comm, task->comm, len)) |
| get_full_task_comm(task_entry, task); |
| return task_entry; |
| } |
| } |
| return NULL; |
| } |
| |
| static struct task_entry *find_or_register_task(struct uid_entry *uid_entry, |
| struct task_struct *task) |
| { |
| struct task_entry *task_entry; |
| pid_t pid = task->pid; |
| |
| task_entry = find_task_entry(uid_entry, task); |
| if (task_entry) |
| return task_entry; |
| |
| task_entry = kzalloc(sizeof(struct task_entry), GFP_ATOMIC); |
| if (!task_entry) |
| return NULL; |
| |
| get_full_task_comm(task_entry, task); |
| |
| task_entry->pid = pid; |
| hash_add(uid_entry->task_entries, &task_entry->hash, (unsigned int)pid); |
| |
| return task_entry; |
| } |
| |
| static void remove_uid_tasks(struct uid_entry *uid_entry) |
| { |
| struct task_entry *task_entry; |
| unsigned long bkt_task; |
| struct hlist_node *tmp_task; |
| |
| hash_for_each_safe(uid_entry->task_entries, bkt_task, |
| tmp_task, task_entry, hash) { |
| hash_del(&task_entry->hash); |
| kfree(task_entry); |
| } |
| } |
| |
| static void set_io_uid_tasks_zero(struct uid_entry *uid_entry) |
| { |
| struct task_entry *task_entry; |
| unsigned long bkt_task; |
| |
| hash_for_each(uid_entry->task_entries, bkt_task, task_entry, hash) { |
| memset(&task_entry->io[UID_STATE_TOTAL_CURR], 0, |
| sizeof(struct io_stats)); |
| } |
| } |
| |
| static void add_uid_tasks_io_stats(struct uid_entry *uid_entry, |
| struct task_struct *task, int slot) |
| { |
| struct task_entry *task_entry = find_or_register_task(uid_entry, task); |
| struct io_stats *task_io_slot = &task_entry->io[slot]; |
| |
| task_io_slot->read_bytes += task->ioac.read_bytes; |
| task_io_slot->write_bytes += compute_write_bytes(task); |
| task_io_slot->rchar += task->ioac.rchar; |
| task_io_slot->wchar += task->ioac.wchar; |
| task_io_slot->fsync += task->ioac.syscfs; |
| } |
| |
| static void compute_io_uid_tasks(struct uid_entry *uid_entry) |
| { |
| struct task_entry *task_entry; |
| unsigned long bkt_task; |
| |
| hash_for_each(uid_entry->task_entries, bkt_task, task_entry, hash) { |
| compute_io_bucket_stats(&task_entry->io[uid_entry->state], |
| &task_entry->io[UID_STATE_TOTAL_CURR], |
| &task_entry->io[UID_STATE_TOTAL_LAST], |
| &task_entry->io[UID_STATE_DEAD_TASKS]); |
| } |
| } |
| |
| static void show_io_uid_tasks(struct seq_file *m, struct uid_entry *uid_entry) |
| { |
| struct task_entry *task_entry; |
| unsigned long bkt_task; |
| |
| hash_for_each(uid_entry->task_entries, bkt_task, task_entry, hash) { |
| /* Separated by comma because space exists in task comm */ |
| seq_printf(m, "task,%s,%lu,%llu,%llu,%llu,%llu,%llu,%llu,%llu,%llu,%llu,%llu\n", |
| task_entry->comm, |
| (unsigned long)task_entry->pid, |
| task_entry->io[UID_STATE_FOREGROUND].rchar, |
| task_entry->io[UID_STATE_FOREGROUND].wchar, |
| task_entry->io[UID_STATE_FOREGROUND].read_bytes, |
| task_entry->io[UID_STATE_FOREGROUND].write_bytes, |
| task_entry->io[UID_STATE_BACKGROUND].rchar, |
| task_entry->io[UID_STATE_BACKGROUND].wchar, |
| task_entry->io[UID_STATE_BACKGROUND].read_bytes, |
| task_entry->io[UID_STATE_BACKGROUND].write_bytes, |
| task_entry->io[UID_STATE_FOREGROUND].fsync, |
| task_entry->io[UID_STATE_BACKGROUND].fsync); |
| } |
| } |
| #else |
| static void remove_uid_tasks(struct uid_entry *uid_entry) {}; |
| static void set_io_uid_tasks_zero(struct uid_entry *uid_entry) {}; |
| static void add_uid_tasks_io_stats(struct uid_entry *uid_entry, |
| struct task_struct *task, int slot) {}; |
| static void compute_io_uid_tasks(struct uid_entry *uid_entry) {}; |
| static void show_io_uid_tasks(struct seq_file *m, |
| struct uid_entry *uid_entry) {} |
| #endif |
| |
| static struct uid_entry *find_uid_entry(uid_t uid) |
| { |
| struct uid_entry *uid_entry; |
| hash_for_each_possible(hash_table, uid_entry, hash, uid) { |
| if (uid_entry->uid == uid) |
| return uid_entry; |
| } |
| return NULL; |
| } |
| |
| static struct uid_entry *find_or_register_uid(uid_t uid) |
| { |
| struct uid_entry *uid_entry; |
| |
| uid_entry = find_uid_entry(uid); |
| if (uid_entry) |
| return uid_entry; |
| |
| uid_entry = kzalloc(sizeof(struct uid_entry), GFP_ATOMIC); |
| if (!uid_entry) |
| return NULL; |
| |
| uid_entry->uid = uid; |
| #ifdef CONFIG_UID_SYS_STATS_DEBUG |
| hash_init(uid_entry->task_entries); |
| #endif |
| hash_add(hash_table, &uid_entry->hash, uid); |
| |
| return uid_entry; |
| } |
| |
| static int uid_cputime_show(struct seq_file *m, void *v) |
| { |
| struct uid_entry *uid_entry = NULL; |
| struct task_struct *task, *temp; |
| struct user_namespace *user_ns = current_user_ns(); |
| u64 utime; |
| u64 stime; |
| unsigned long bkt; |
| uid_t uid; |
| |
| rt_mutex_lock(&uid_lock); |
| |
| hash_for_each(hash_table, bkt, uid_entry, hash) { |
| uid_entry->active_stime = 0; |
| uid_entry->active_utime = 0; |
| } |
| |
| rcu_read_lock(); |
| do_each_thread(temp, task) { |
| uid = from_kuid_munged(user_ns, task_uid(task)); |
| if (!uid_entry || uid_entry->uid != uid) |
| uid_entry = find_or_register_uid(uid); |
| if (!uid_entry) { |
| rcu_read_unlock(); |
| rt_mutex_unlock(&uid_lock); |
| pr_err("%s: failed to find the uid_entry for uid %d\n", |
| __func__, uid); |
| return -ENOMEM; |
| } |
| /* avoid double accounting of dying threads */ |
| if (!(task->flags & PF_EXITING)) { |
| task_cputime_adjusted(task, &utime, &stime); |
| uid_entry->active_utime += utime; |
| uid_entry->active_stime += stime; |
| } |
| } while_each_thread(temp, task); |
| rcu_read_unlock(); |
| |
| hash_for_each(hash_table, bkt, uid_entry, hash) { |
| u64 total_utime = uid_entry->utime + |
| uid_entry->active_utime; |
| u64 total_stime = uid_entry->stime + |
| uid_entry->active_stime; |
| seq_printf(m, "%d: %llu %llu\n", uid_entry->uid, |
| ktime_to_us(total_utime), ktime_to_us(total_stime)); |
| } |
| |
| rt_mutex_unlock(&uid_lock); |
| return 0; |
| } |
| |
| static int uid_cputime_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, uid_cputime_show, PDE_DATA(inode)); |
| } |
| |
| static const struct file_operations uid_cputime_fops = { |
| .open = uid_cputime_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int uid_remove_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, NULL, NULL); |
| } |
| |
| static ssize_t uid_remove_write(struct file *file, |
| const char __user *buffer, size_t count, loff_t *ppos) |
| { |
| struct uid_entry *uid_entry; |
| struct hlist_node *tmp; |
| char uids[128]; |
| char *start_uid, *end_uid = NULL; |
| long int uid_start = 0, uid_end = 0; |
| |
| if (count >= sizeof(uids)) |
| count = sizeof(uids) - 1; |
| |
| if (copy_from_user(uids, buffer, count)) |
| return -EFAULT; |
| |
| uids[count] = '\0'; |
| end_uid = uids; |
| start_uid = strsep(&end_uid, "-"); |
| |
| if (!start_uid || !end_uid) |
| return -EINVAL; |
| |
| if (kstrtol(start_uid, 10, &uid_start) != 0 || |
| kstrtol(end_uid, 10, &uid_end) != 0) { |
| return -EINVAL; |
| } |
| |
| if (uid_start >= INT_MAX || uid_end >= INT_MAX) |
| return -EINVAL; |
| |
| /* Also remove uids from /proc/uid_time_in_state */ |
| cpufreq_task_times_remove_uids(uid_start, uid_end); |
| |
| rt_mutex_lock(&uid_lock); |
| |
| for (; uid_start <= uid_end; uid_start++) { |
| hash_for_each_possible_safe(hash_table, uid_entry, tmp, |
| hash, (uid_t)uid_start) { |
| if (uid_start == uid_entry->uid) { |
| remove_uid_tasks(uid_entry); |
| hash_del(&uid_entry->hash); |
| kfree(uid_entry); |
| } |
| } |
| } |
| |
| rt_mutex_unlock(&uid_lock); |
| return count; |
| } |
| |
| static const struct file_operations uid_remove_fops = { |
| .open = uid_remove_open, |
| .release = single_release, |
| .write = uid_remove_write, |
| }; |
| |
| |
| static void add_uid_io_stats(struct uid_entry *uid_entry, |
| struct task_struct *task, int slot) |
| { |
| struct io_stats *io_slot = &uid_entry->io[slot]; |
| |
| /* avoid double accounting of dying threads */ |
| if (slot != UID_STATE_DEAD_TASKS && (task->flags & PF_EXITING)) |
| return; |
| |
| io_slot->read_bytes += task->ioac.read_bytes; |
| io_slot->write_bytes += compute_write_bytes(task); |
| io_slot->rchar += task->ioac.rchar; |
| io_slot->wchar += task->ioac.wchar; |
| io_slot->fsync += task->ioac.syscfs; |
| |
| add_uid_tasks_io_stats(uid_entry, task, slot); |
| } |
| |
| static void update_io_stats_all_locked(void) |
| { |
| struct uid_entry *uid_entry = NULL; |
| struct task_struct *task, *temp; |
| struct user_namespace *user_ns = current_user_ns(); |
| unsigned long bkt; |
| uid_t uid; |
| |
| hash_for_each(hash_table, bkt, uid_entry, hash) { |
| memset(&uid_entry->io[UID_STATE_TOTAL_CURR], 0, |
| sizeof(struct io_stats)); |
| set_io_uid_tasks_zero(uid_entry); |
| } |
| |
| rcu_read_lock(); |
| do_each_thread(temp, task) { |
| uid = from_kuid_munged(user_ns, task_uid(task)); |
| if (!uid_entry || uid_entry->uid != uid) |
| uid_entry = find_or_register_uid(uid); |
| if (!uid_entry) |
| continue; |
| add_uid_io_stats(uid_entry, task, UID_STATE_TOTAL_CURR); |
| } while_each_thread(temp, task); |
| rcu_read_unlock(); |
| |
| hash_for_each(hash_table, bkt, uid_entry, hash) { |
| compute_io_bucket_stats(&uid_entry->io[uid_entry->state], |
| &uid_entry->io[UID_STATE_TOTAL_CURR], |
| &uid_entry->io[UID_STATE_TOTAL_LAST], |
| &uid_entry->io[UID_STATE_DEAD_TASKS]); |
| compute_io_uid_tasks(uid_entry); |
| } |
| } |
| |
| static void update_io_stats_uid_locked(struct uid_entry *uid_entry) |
| { |
| struct task_struct *task, *temp; |
| struct user_namespace *user_ns = current_user_ns(); |
| |
| memset(&uid_entry->io[UID_STATE_TOTAL_CURR], 0, |
| sizeof(struct io_stats)); |
| set_io_uid_tasks_zero(uid_entry); |
| |
| rcu_read_lock(); |
| do_each_thread(temp, task) { |
| if (from_kuid_munged(user_ns, task_uid(task)) != uid_entry->uid) |
| continue; |
| add_uid_io_stats(uid_entry, task, UID_STATE_TOTAL_CURR); |
| } while_each_thread(temp, task); |
| rcu_read_unlock(); |
| |
| compute_io_bucket_stats(&uid_entry->io[uid_entry->state], |
| &uid_entry->io[UID_STATE_TOTAL_CURR], |
| &uid_entry->io[UID_STATE_TOTAL_LAST], |
| &uid_entry->io[UID_STATE_DEAD_TASKS]); |
| compute_io_uid_tasks(uid_entry); |
| } |
| |
| |
| static int uid_io_show(struct seq_file *m, void *v) |
| { |
| struct uid_entry *uid_entry; |
| unsigned long bkt; |
| |
| rt_mutex_lock(&uid_lock); |
| |
| update_io_stats_all_locked(); |
| |
| hash_for_each(hash_table, bkt, uid_entry, hash) { |
| seq_printf(m, "%d %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n", |
| uid_entry->uid, |
| uid_entry->io[UID_STATE_FOREGROUND].rchar, |
| uid_entry->io[UID_STATE_FOREGROUND].wchar, |
| uid_entry->io[UID_STATE_FOREGROUND].read_bytes, |
| uid_entry->io[UID_STATE_FOREGROUND].write_bytes, |
| uid_entry->io[UID_STATE_BACKGROUND].rchar, |
| uid_entry->io[UID_STATE_BACKGROUND].wchar, |
| uid_entry->io[UID_STATE_BACKGROUND].read_bytes, |
| uid_entry->io[UID_STATE_BACKGROUND].write_bytes, |
| uid_entry->io[UID_STATE_FOREGROUND].fsync, |
| uid_entry->io[UID_STATE_BACKGROUND].fsync); |
| |
| show_io_uid_tasks(m, uid_entry); |
| } |
| |
| rt_mutex_unlock(&uid_lock); |
| return 0; |
| } |
| |
| static int uid_io_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, uid_io_show, PDE_DATA(inode)); |
| } |
| |
| static const struct file_operations uid_io_fops = { |
| .open = uid_io_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int uid_procstat_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, NULL, NULL); |
| } |
| |
| static ssize_t uid_procstat_write(struct file *file, |
| const char __user *buffer, size_t count, loff_t *ppos) |
| { |
| struct uid_entry *uid_entry; |
| uid_t uid; |
| int argc, state; |
| char input[128]; |
| |
| if (count >= sizeof(input)) |
| return -EINVAL; |
| |
| if (copy_from_user(input, buffer, count)) |
| return -EFAULT; |
| |
| input[count] = '\0'; |
| |
| argc = sscanf(input, "%u %d", &uid, &state); |
| if (argc != 2) |
| return -EINVAL; |
| |
| if (state != UID_STATE_BACKGROUND && state != UID_STATE_FOREGROUND) |
| return -EINVAL; |
| |
| rt_mutex_lock(&uid_lock); |
| |
| uid_entry = find_or_register_uid(uid); |
| if (!uid_entry) { |
| rt_mutex_unlock(&uid_lock); |
| return -EINVAL; |
| } |
| |
| if (uid_entry->state == state) { |
| rt_mutex_unlock(&uid_lock); |
| return count; |
| } |
| |
| update_io_stats_uid_locked(uid_entry); |
| |
| uid_entry->state = state; |
| |
| rt_mutex_unlock(&uid_lock); |
| |
| return count; |
| } |
| |
| static const struct file_operations uid_procstat_fops = { |
| .open = uid_procstat_open, |
| .release = single_release, |
| .write = uid_procstat_write, |
| }; |
| |
| static int process_notifier(struct notifier_block *self, |
| unsigned long cmd, void *v) |
| { |
| struct task_struct *task = v; |
| struct uid_entry *uid_entry; |
| u64 utime, stime; |
| uid_t uid; |
| |
| if (!task) |
| return NOTIFY_OK; |
| |
| rt_mutex_lock(&uid_lock); |
| uid = from_kuid_munged(current_user_ns(), task_uid(task)); |
| uid_entry = find_or_register_uid(uid); |
| if (!uid_entry) { |
| pr_err("%s: failed to find uid %d\n", __func__, uid); |
| goto exit; |
| } |
| |
| task_cputime_adjusted(task, &utime, &stime); |
| uid_entry->utime += utime; |
| uid_entry->stime += stime; |
| |
| add_uid_io_stats(uid_entry, task, UID_STATE_DEAD_TASKS); |
| |
| exit: |
| rt_mutex_unlock(&uid_lock); |
| return NOTIFY_OK; |
| } |
| |
| static struct notifier_block process_notifier_block = { |
| .notifier_call = process_notifier, |
| }; |
| |
| static int __init proc_uid_sys_stats_init(void) |
| { |
| hash_init(hash_table); |
| |
| cpu_parent = proc_mkdir("uid_cputime", NULL); |
| if (!cpu_parent) { |
| pr_err("%s: failed to create uid_cputime proc entry\n", |
| __func__); |
| goto err; |
| } |
| |
| proc_create_data("remove_uid_range", 0222, cpu_parent, |
| &uid_remove_fops, NULL); |
| proc_create_data("show_uid_stat", 0444, cpu_parent, |
| &uid_cputime_fops, NULL); |
| |
| io_parent = proc_mkdir("uid_io", NULL); |
| if (!io_parent) { |
| pr_err("%s: failed to create uid_io proc entry\n", |
| __func__); |
| goto err; |
| } |
| |
| proc_create_data("stats", 0444, io_parent, |
| &uid_io_fops, NULL); |
| |
| proc_parent = proc_mkdir("uid_procstat", NULL); |
| if (!proc_parent) { |
| pr_err("%s: failed to create uid_procstat proc entry\n", |
| __func__); |
| goto err; |
| } |
| |
| proc_create_data("set", 0222, proc_parent, |
| &uid_procstat_fops, NULL); |
| |
| profile_event_register(PROFILE_TASK_EXIT, &process_notifier_block); |
| |
| return 0; |
| |
| err: |
| remove_proc_subtree("uid_cputime", NULL); |
| remove_proc_subtree("uid_io", NULL); |
| remove_proc_subtree("uid_procstat", NULL); |
| return -ENOMEM; |
| } |
| |
| early_initcall(proc_uid_sys_stats_init); |