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698 lines
15 KiB
698 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* taskstats.c - Export per-task statistics to userland |
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* |
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* Copyright (C) Shailabh Nagar, IBM Corp. 2006 |
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* (C) Balbir Singh, IBM Corp. 2006 |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/taskstats_kern.h> |
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#include <linux/tsacct_kern.h> |
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#include <linux/delayacct.h> |
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#include <linux/cpumask.h> |
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#include <linux/percpu.h> |
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#include <linux/slab.h> |
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#include <linux/cgroupstats.h> |
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#include <linux/cgroup.h> |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/pid_namespace.h> |
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#include <net/genetlink.h> |
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#include <linux/atomic.h> |
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#include <linux/sched/cputime.h> |
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|
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/* |
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* Maximum length of a cpumask that can be specified in |
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* the TASKSTATS_CMD_ATTR_REGISTER/DEREGISTER_CPUMASK attribute |
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*/ |
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#define TASKSTATS_CPUMASK_MAXLEN (100+6*NR_CPUS) |
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static DEFINE_PER_CPU(__u32, taskstats_seqnum); |
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static int family_registered; |
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struct kmem_cache *taskstats_cache; |
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static struct genl_family family; |
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static const struct nla_policy taskstats_cmd_get_policy[] = { |
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[TASKSTATS_CMD_ATTR_PID] = { .type = NLA_U32 }, |
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[TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 }, |
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[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING }, |
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[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },}; |
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static const struct nla_policy cgroupstats_cmd_get_policy[] = { |
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[CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 }, |
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}; |
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struct listener { |
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struct list_head list; |
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pid_t pid; |
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char valid; |
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}; |
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struct listener_list { |
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struct rw_semaphore sem; |
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struct list_head list; |
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}; |
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static DEFINE_PER_CPU(struct listener_list, listener_array); |
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enum actions { |
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REGISTER, |
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DEREGISTER, |
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CPU_DONT_CARE |
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}; |
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static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp, |
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size_t size) |
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{ |
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struct sk_buff *skb; |
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void *reply; |
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/* |
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* If new attributes are added, please revisit this allocation |
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*/ |
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skb = genlmsg_new(size, GFP_KERNEL); |
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if (!skb) |
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return -ENOMEM; |
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if (!info) { |
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int seq = this_cpu_inc_return(taskstats_seqnum) - 1; |
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reply = genlmsg_put(skb, 0, seq, &family, 0, cmd); |
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} else |
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reply = genlmsg_put_reply(skb, info, &family, 0, cmd); |
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if (reply == NULL) { |
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nlmsg_free(skb); |
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return -EINVAL; |
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} |
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*skbp = skb; |
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return 0; |
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} |
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/* |
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* Send taskstats data in @skb to listener with nl_pid @pid |
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*/ |
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static int send_reply(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
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void *reply = genlmsg_data(genlhdr); |
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genlmsg_end(skb, reply); |
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return genlmsg_reply(skb, info); |
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} |
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/* |
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* Send taskstats data in @skb to listeners registered for @cpu's exit data |
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*/ |
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static void send_cpu_listeners(struct sk_buff *skb, |
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struct listener_list *listeners) |
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{ |
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struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb)); |
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struct listener *s, *tmp; |
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struct sk_buff *skb_next, *skb_cur = skb; |
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void *reply = genlmsg_data(genlhdr); |
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int rc, delcount = 0; |
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genlmsg_end(skb, reply); |
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rc = 0; |
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down_read(&listeners->sem); |
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list_for_each_entry(s, &listeners->list, list) { |
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skb_next = NULL; |
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if (!list_is_last(&s->list, &listeners->list)) { |
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skb_next = skb_clone(skb_cur, GFP_KERNEL); |
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if (!skb_next) |
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break; |
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} |
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rc = genlmsg_unicast(&init_net, skb_cur, s->pid); |
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if (rc == -ECONNREFUSED) { |
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s->valid = 0; |
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delcount++; |
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} |
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skb_cur = skb_next; |
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} |
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up_read(&listeners->sem); |
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if (skb_cur) |
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nlmsg_free(skb_cur); |
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if (!delcount) |
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return; |
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/* Delete invalidated entries */ |
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down_write(&listeners->sem); |
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list_for_each_entry_safe(s, tmp, &listeners->list, list) { |
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if (!s->valid) { |
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list_del(&s->list); |
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kfree(s); |
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} |
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} |
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up_write(&listeners->sem); |
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} |
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static void fill_stats(struct user_namespace *user_ns, |
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struct pid_namespace *pid_ns, |
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struct task_struct *tsk, struct taskstats *stats) |
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{ |
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memset(stats, 0, sizeof(*stats)); |
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/* |
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* Each accounting subsystem adds calls to its functions to |
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* fill in relevant parts of struct taskstsats as follows |
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* |
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* per-task-foo(stats, tsk); |
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*/ |
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delayacct_add_tsk(stats, tsk); |
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/* fill in basic acct fields */ |
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stats->version = TASKSTATS_VERSION; |
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stats->nvcsw = tsk->nvcsw; |
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stats->nivcsw = tsk->nivcsw; |
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bacct_add_tsk(user_ns, pid_ns, stats, tsk); |
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|
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/* fill in extended acct fields */ |
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xacct_add_tsk(stats, tsk); |
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} |
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static int fill_stats_for_pid(pid_t pid, struct taskstats *stats) |
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{ |
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struct task_struct *tsk; |
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tsk = find_get_task_by_vpid(pid); |
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if (!tsk) |
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return -ESRCH; |
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fill_stats(current_user_ns(), task_active_pid_ns(current), tsk, stats); |
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put_task_struct(tsk); |
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return 0; |
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} |
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static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats) |
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{ |
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struct task_struct *tsk, *first; |
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unsigned long flags; |
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int rc = -ESRCH; |
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u64 delta, utime, stime; |
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u64 start_time; |
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/* |
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* Add additional stats from live tasks except zombie thread group |
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* leaders who are already counted with the dead tasks |
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*/ |
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rcu_read_lock(); |
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first = find_task_by_vpid(tgid); |
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if (!first || !lock_task_sighand(first, &flags)) |
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goto out; |
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if (first->signal->stats) |
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memcpy(stats, first->signal->stats, sizeof(*stats)); |
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else |
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memset(stats, 0, sizeof(*stats)); |
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tsk = first; |
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start_time = ktime_get_ns(); |
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do { |
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if (tsk->exit_state) |
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continue; |
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/* |
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* Accounting subsystem can call its functions here to |
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* fill in relevant parts of struct taskstsats as follows |
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* |
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* per-task-foo(stats, tsk); |
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*/ |
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delayacct_add_tsk(stats, tsk); |
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|
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/* calculate task elapsed time in nsec */ |
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delta = start_time - tsk->start_time; |
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/* Convert to micro seconds */ |
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do_div(delta, NSEC_PER_USEC); |
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stats->ac_etime += delta; |
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task_cputime(tsk, &utime, &stime); |
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stats->ac_utime += div_u64(utime, NSEC_PER_USEC); |
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stats->ac_stime += div_u64(stime, NSEC_PER_USEC); |
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stats->nvcsw += tsk->nvcsw; |
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stats->nivcsw += tsk->nivcsw; |
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} while_each_thread(first, tsk); |
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unlock_task_sighand(first, &flags); |
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rc = 0; |
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out: |
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rcu_read_unlock(); |
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stats->version = TASKSTATS_VERSION; |
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/* |
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* Accounting subsystems can also add calls here to modify |
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* fields of taskstats. |
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*/ |
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return rc; |
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} |
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static void fill_tgid_exit(struct task_struct *tsk) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&tsk->sighand->siglock, flags); |
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if (!tsk->signal->stats) |
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goto ret; |
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/* |
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* Each accounting subsystem calls its functions here to |
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* accumalate its per-task stats for tsk, into the per-tgid structure |
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* |
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* per-task-foo(tsk->signal->stats, tsk); |
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*/ |
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delayacct_add_tsk(tsk->signal->stats, tsk); |
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ret: |
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spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
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return; |
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} |
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static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd) |
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{ |
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struct listener_list *listeners; |
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struct listener *s, *tmp, *s2; |
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unsigned int cpu; |
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int ret = 0; |
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if (!cpumask_subset(mask, cpu_possible_mask)) |
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return -EINVAL; |
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if (current_user_ns() != &init_user_ns) |
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return -EINVAL; |
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if (task_active_pid_ns(current) != &init_pid_ns) |
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return -EINVAL; |
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if (isadd == REGISTER) { |
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for_each_cpu(cpu, mask) { |
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s = kmalloc_node(sizeof(struct listener), |
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GFP_KERNEL, cpu_to_node(cpu)); |
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if (!s) { |
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ret = -ENOMEM; |
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goto cleanup; |
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} |
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s->pid = pid; |
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s->valid = 1; |
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listeners = &per_cpu(listener_array, cpu); |
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down_write(&listeners->sem); |
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list_for_each_entry(s2, &listeners->list, list) { |
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if (s2->pid == pid && s2->valid) |
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goto exists; |
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} |
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list_add(&s->list, &listeners->list); |
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s = NULL; |
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exists: |
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up_write(&listeners->sem); |
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kfree(s); /* nop if NULL */ |
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} |
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return 0; |
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} |
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/* Deregister or cleanup */ |
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cleanup: |
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for_each_cpu(cpu, mask) { |
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listeners = &per_cpu(listener_array, cpu); |
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down_write(&listeners->sem); |
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list_for_each_entry_safe(s, tmp, &listeners->list, list) { |
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if (s->pid == pid) { |
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list_del(&s->list); |
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kfree(s); |
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break; |
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} |
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} |
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up_write(&listeners->sem); |
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} |
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return ret; |
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} |
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static int parse(struct nlattr *na, struct cpumask *mask) |
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{ |
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char *data; |
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int len; |
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int ret; |
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if (na == NULL) |
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return 1; |
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len = nla_len(na); |
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if (len > TASKSTATS_CPUMASK_MAXLEN) |
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return -E2BIG; |
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if (len < 1) |
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return -EINVAL; |
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data = kmalloc(len, GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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nla_strscpy(data, na, len); |
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ret = cpulist_parse(data, mask); |
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kfree(data); |
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return ret; |
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} |
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static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid) |
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{ |
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struct nlattr *na, *ret; |
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int aggr; |
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aggr = (type == TASKSTATS_TYPE_PID) |
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? TASKSTATS_TYPE_AGGR_PID |
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: TASKSTATS_TYPE_AGGR_TGID; |
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na = nla_nest_start_noflag(skb, aggr); |
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if (!na) |
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goto err; |
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if (nla_put(skb, type, sizeof(pid), &pid) < 0) { |
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nla_nest_cancel(skb, na); |
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goto err; |
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} |
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ret = nla_reserve_64bit(skb, TASKSTATS_TYPE_STATS, |
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sizeof(struct taskstats), TASKSTATS_TYPE_NULL); |
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if (!ret) { |
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nla_nest_cancel(skb, na); |
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goto err; |
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} |
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nla_nest_end(skb, na); |
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return nla_data(ret); |
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err: |
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return NULL; |
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} |
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static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
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{ |
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int rc = 0; |
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struct sk_buff *rep_skb; |
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struct cgroupstats *stats; |
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struct nlattr *na; |
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size_t size; |
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u32 fd; |
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struct fd f; |
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na = info->attrs[CGROUPSTATS_CMD_ATTR_FD]; |
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if (!na) |
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return -EINVAL; |
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fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]); |
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f = fdget(fd); |
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if (!f.file) |
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return 0; |
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size = nla_total_size(sizeof(struct cgroupstats)); |
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rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb, |
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size); |
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if (rc < 0) |
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goto err; |
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na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS, |
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sizeof(struct cgroupstats)); |
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if (na == NULL) { |
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nlmsg_free(rep_skb); |
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rc = -EMSGSIZE; |
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goto err; |
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} |
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stats = nla_data(na); |
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memset(stats, 0, sizeof(*stats)); |
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rc = cgroupstats_build(stats, f.file->f_path.dentry); |
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if (rc < 0) { |
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nlmsg_free(rep_skb); |
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goto err; |
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} |
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rc = send_reply(rep_skb, info); |
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err: |
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fdput(f); |
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return rc; |
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} |
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static int cmd_attr_register_cpumask(struct genl_info *info) |
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{ |
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cpumask_var_t mask; |
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int rc; |
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if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
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return -ENOMEM; |
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rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask); |
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if (rc < 0) |
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goto out; |
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rc = add_del_listener(info->snd_portid, mask, REGISTER); |
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out: |
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free_cpumask_var(mask); |
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return rc; |
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} |
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static int cmd_attr_deregister_cpumask(struct genl_info *info) |
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{ |
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cpumask_var_t mask; |
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int rc; |
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if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
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return -ENOMEM; |
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rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], mask); |
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if (rc < 0) |
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goto out; |
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rc = add_del_listener(info->snd_portid, mask, DEREGISTER); |
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out: |
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free_cpumask_var(mask); |
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return rc; |
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} |
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static size_t taskstats_packet_size(void) |
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{ |
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size_t size; |
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size = nla_total_size(sizeof(u32)) + |
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nla_total_size_64bit(sizeof(struct taskstats)) + |
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nla_total_size(0); |
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return size; |
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} |
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static int cmd_attr_pid(struct genl_info *info) |
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{ |
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struct taskstats *stats; |
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struct sk_buff *rep_skb; |
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size_t size; |
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u32 pid; |
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int rc; |
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size = taskstats_packet_size(); |
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rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
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if (rc < 0) |
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return rc; |
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rc = -EINVAL; |
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pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]); |
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stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid); |
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if (!stats) |
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goto err; |
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rc = fill_stats_for_pid(pid, stats); |
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if (rc < 0) |
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goto err; |
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return send_reply(rep_skb, info); |
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err: |
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nlmsg_free(rep_skb); |
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return rc; |
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} |
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static int cmd_attr_tgid(struct genl_info *info) |
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{ |
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struct taskstats *stats; |
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struct sk_buff *rep_skb; |
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size_t size; |
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u32 tgid; |
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int rc; |
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size = taskstats_packet_size(); |
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rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size); |
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if (rc < 0) |
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return rc; |
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rc = -EINVAL; |
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tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]); |
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stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid); |
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if (!stats) |
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goto err; |
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rc = fill_stats_for_tgid(tgid, stats); |
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if (rc < 0) |
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goto err; |
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return send_reply(rep_skb, info); |
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err: |
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nlmsg_free(rep_skb); |
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return rc; |
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} |
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static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info) |
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{ |
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if (info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK]) |
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return cmd_attr_register_cpumask(info); |
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else if (info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK]) |
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return cmd_attr_deregister_cpumask(info); |
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else if (info->attrs[TASKSTATS_CMD_ATTR_PID]) |
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return cmd_attr_pid(info); |
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else if (info->attrs[TASKSTATS_CMD_ATTR_TGID]) |
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return cmd_attr_tgid(info); |
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else |
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return -EINVAL; |
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} |
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static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk) |
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{ |
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struct signal_struct *sig = tsk->signal; |
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struct taskstats *stats_new, *stats; |
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|
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/* Pairs with smp_store_release() below. */ |
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stats = smp_load_acquire(&sig->stats); |
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if (stats || thread_group_empty(tsk)) |
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return stats; |
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/* No problem if kmem_cache_zalloc() fails */ |
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stats_new = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL); |
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spin_lock_irq(&tsk->sighand->siglock); |
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stats = sig->stats; |
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if (!stats) { |
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/* |
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* Pairs with smp_store_release() above and order the |
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* kmem_cache_zalloc(). |
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*/ |
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smp_store_release(&sig->stats, stats_new); |
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stats = stats_new; |
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stats_new = NULL; |
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} |
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spin_unlock_irq(&tsk->sighand->siglock); |
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if (stats_new) |
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kmem_cache_free(taskstats_cache, stats_new); |
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return stats; |
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} |
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|
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/* Send pid data out on exit */ |
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void taskstats_exit(struct task_struct *tsk, int group_dead) |
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{ |
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int rc; |
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struct listener_list *listeners; |
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struct taskstats *stats; |
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struct sk_buff *rep_skb; |
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size_t size; |
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int is_thread_group; |
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|
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if (!family_registered) |
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return; |
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|
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/* |
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* Size includes space for nested attributes |
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*/ |
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size = taskstats_packet_size(); |
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|
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is_thread_group = !!taskstats_tgid_alloc(tsk); |
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if (is_thread_group) { |
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/* PID + STATS + TGID + STATS */ |
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size = 2 * size; |
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/* fill the tsk->signal->stats structure */ |
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fill_tgid_exit(tsk); |
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} |
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listeners = raw_cpu_ptr(&listener_array); |
|
if (list_empty(&listeners->list)) |
|
return; |
|
|
|
rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size); |
|
if (rc < 0) |
|
return; |
|
|
|
stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, |
|
task_pid_nr_ns(tsk, &init_pid_ns)); |
|
if (!stats) |
|
goto err; |
|
|
|
fill_stats(&init_user_ns, &init_pid_ns, tsk, stats); |
|
|
|
/* |
|
* Doesn't matter if tsk is the leader or the last group member leaving |
|
*/ |
|
if (!is_thread_group || !group_dead) |
|
goto send; |
|
|
|
stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, |
|
task_tgid_nr_ns(tsk, &init_pid_ns)); |
|
if (!stats) |
|
goto err; |
|
|
|
memcpy(stats, tsk->signal->stats, sizeof(*stats)); |
|
|
|
send: |
|
send_cpu_listeners(rep_skb, listeners); |
|
return; |
|
err: |
|
nlmsg_free(rep_skb); |
|
} |
|
|
|
static const struct genl_ops taskstats_ops[] = { |
|
{ |
|
.cmd = TASKSTATS_CMD_GET, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.doit = taskstats_user_cmd, |
|
.policy = taskstats_cmd_get_policy, |
|
.maxattr = ARRAY_SIZE(taskstats_cmd_get_policy) - 1, |
|
.flags = GENL_ADMIN_PERM, |
|
}, |
|
{ |
|
.cmd = CGROUPSTATS_CMD_GET, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.doit = cgroupstats_user_cmd, |
|
.policy = cgroupstats_cmd_get_policy, |
|
.maxattr = ARRAY_SIZE(cgroupstats_cmd_get_policy) - 1, |
|
}, |
|
}; |
|
|
|
static struct genl_family family __ro_after_init = { |
|
.name = TASKSTATS_GENL_NAME, |
|
.version = TASKSTATS_GENL_VERSION, |
|
.module = THIS_MODULE, |
|
.ops = taskstats_ops, |
|
.n_ops = ARRAY_SIZE(taskstats_ops), |
|
}; |
|
|
|
/* Needed early in initialization */ |
|
void __init taskstats_init_early(void) |
|
{ |
|
unsigned int i; |
|
|
|
taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC); |
|
for_each_possible_cpu(i) { |
|
INIT_LIST_HEAD(&(per_cpu(listener_array, i).list)); |
|
init_rwsem(&(per_cpu(listener_array, i).sem)); |
|
} |
|
} |
|
|
|
static int __init taskstats_init(void) |
|
{ |
|
int rc; |
|
|
|
rc = genl_register_family(&family); |
|
if (rc) |
|
return rc; |
|
|
|
family_registered = 1; |
|
pr_info("registered taskstats version %d\n", TASKSTATS_GENL_VERSION); |
|
return 0; |
|
} |
|
|
|
/* |
|
* late initcall ensures initialization of statistics collection |
|
* mechanisms precedes initialization of the taskstats interface |
|
*/ |
|
late_initcall(taskstats_init);
|
|
|