1/*
2 * tsacct.c - System accounting over taskstats interface
3 *
4 * Copyright (C) Jay Lan, <jlan@sgi.com>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 */
18
19#include <linux/kernel.h>
20#include <linux/sched/signal.h>
21#include <linux/sched/mm.h>
22#include <linux/sched/cputime.h>
23#include <linux/tsacct_kern.h>
24#include <linux/acct.h>
25#include <linux/jiffies.h>
26#include <linux/mm.h>
27
28/*
29 * fill in basic accounting fields
30 */
31void bacct_add_tsk(struct user_namespace *user_ns,
32 struct pid_namespace *pid_ns,
33 struct taskstats *stats, struct task_struct *tsk)
34{
35 const struct cred *tcred;
36 u64 utime, stime, utimescaled, stimescaled;
37 u64 delta;
38
39 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
40
41 /* calculate task elapsed time in nsec */
42 delta = ktime_get_ns() - tsk->start_time;
43 /* Convert to micro seconds */
44 do_div(delta, NSEC_PER_USEC);
45 stats->ac_etime = delta;
46 /* Convert to seconds for btime */
47 do_div(delta, USEC_PER_SEC);
48 stats->ac_btime = get_seconds() - delta;
49 if (thread_group_leader(tsk)) {
50 stats->ac_exitcode = tsk->exit_code;
51 if (tsk->flags & PF_FORKNOEXEC)
52 stats->ac_flag |= AFORK;
53 }
54 if (tsk->flags & PF_SUPERPRIV)
55 stats->ac_flag |= ASU;
56 if (tsk->flags & PF_DUMPCORE)
57 stats->ac_flag |= ACORE;
58 if (tsk->flags & PF_SIGNALED)
59 stats->ac_flag |= AXSIG;
60 stats->ac_nice = task_nice(tsk);
61 stats->ac_sched = tsk->policy;
62 stats->ac_pid = task_pid_nr_ns(tsk, pid_ns);
63 rcu_read_lock();
64 tcred = __task_cred(tsk);
65 stats->ac_uid = from_kuid_munged(user_ns, tcred->uid);
66 stats->ac_gid = from_kgid_munged(user_ns, tcred->gid);
67 stats->ac_ppid = pid_alive(tsk) ?
68 task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
69 rcu_read_unlock();
70
71 task_cputime(tsk, &utime, &stime);
72 stats->ac_utime = div_u64(utime, NSEC_PER_USEC);
73 stats->ac_stime = div_u64(stime, NSEC_PER_USEC);
74
75 task_cputime_scaled(tsk, &utimescaled, &stimescaled);
76 stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC);
77 stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC);
78
79 stats->ac_minflt = tsk->min_flt;
80 stats->ac_majflt = tsk->maj_flt;
81
82 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
83}
84
85
86#ifdef CONFIG_TASK_XACCT
87
88#define KB 1024
89#define MB (1024*KB)
90#define KB_MASK (~(KB-1))
91/*
92 * fill in extended accounting fields
93 */
94void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
95{
96 struct mm_struct *mm;
97
98 /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */
99 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE;
100 do_div(stats->coremem, 1000 * KB);
101 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE;
102 do_div(stats->virtmem, 1000 * KB);
103 mm = get_task_mm(p);
104 if (mm) {
105 /* adjust to KB unit */
106 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
107 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
108 mmput(mm);
109 }
110 stats->read_char = p->ioac.rchar & KB_MASK;
111 stats->write_char = p->ioac.wchar & KB_MASK;
112 stats->read_syscalls = p->ioac.syscr & KB_MASK;
113 stats->write_syscalls = p->ioac.syscw & KB_MASK;
114#ifdef CONFIG_TASK_IO_ACCOUNTING
115 stats->read_bytes = p->ioac.read_bytes & KB_MASK;
116 stats->write_bytes = p->ioac.write_bytes & KB_MASK;
117 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
118#else
119 stats->read_bytes = 0;
120 stats->write_bytes = 0;
121 stats->cancelled_write_bytes = 0;
122#endif
123}
124#undef KB
125#undef MB
126
127static void __acct_update_integrals(struct task_struct *tsk,
128 u64 utime, u64 stime)
129{
130 u64 time, delta;
131
132 if (!likely(tsk->mm))
133 return;
134
135 time = stime + utime;
136 delta = time - tsk->acct_timexpd;
137
138 if (delta < TICK_NSEC)
139 return;
140
141 tsk->acct_timexpd = time;
142 /*
143 * Divide by 1024 to avoid overflow, and to avoid division.
144 * The final unit reported to userspace is Mbyte-usecs,
145 * the rest of the math is done in xacct_add_tsk.
146 */
147 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10;
148 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10;
149}
150
151/**
152 * acct_update_integrals - update mm integral fields in task_struct
153 * @tsk: task_struct for accounting
154 */
155void acct_update_integrals(struct task_struct *tsk)
156{
157 u64 utime, stime;
158 unsigned long flags;
159
160 local_irq_save(flags);
161 task_cputime(tsk, &utime, &stime);
162 __acct_update_integrals(tsk, utime, stime);
163 local_irq_restore(flags);
164}
165
166/**
167 * acct_account_cputime - update mm integral after cputime update
168 * @tsk: task_struct for accounting
169 */
170void acct_account_cputime(struct task_struct *tsk)
171{
172 __acct_update_integrals(tsk, tsk->utime, tsk->stime);
173}
174
175/**
176 * acct_clear_integrals - clear the mm integral fields in task_struct
177 * @tsk: task_struct whose accounting fields are cleared
178 */
179void acct_clear_integrals(struct task_struct *tsk)
180{
181 tsk->acct_timexpd = 0;
182 tsk->acct_rss_mem1 = 0;
183 tsk->acct_vm_mem1 = 0;
184}
185#endif
186