Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f3cef7a9 JL |
2 | /* |
3 | * tsacct.c - System accounting over taskstats interface | |
4 | * | |
5 | * Copyright (C) Jay Lan, <jlan@sgi.com> | |
f3cef7a9 JL |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
3f07c014 | 9 | #include <linux/sched/signal.h> |
6e84f315 | 10 | #include <linux/sched/mm.h> |
32ef5517 | 11 | #include <linux/sched/cputime.h> |
f3cef7a9 JL |
12 | #include <linux/tsacct_kern.h> |
13 | #include <linux/acct.h> | |
db5fed26 | 14 | #include <linux/jiffies.h> |
d559db08 | 15 | #include <linux/mm.h> |
f3cef7a9 | 16 | |
f3cef7a9 JL |
17 | /* |
18 | * fill in basic accounting fields | |
19 | */ | |
4bd6e32a EB |
20 | void bacct_add_tsk(struct user_namespace *user_ns, |
21 | struct pid_namespace *pid_ns, | |
22 | struct taskstats *stats, struct task_struct *tsk) | |
f3cef7a9 | 23 | { |
c69e8d9c | 24 | const struct cred *tcred; |
605dc2b3 | 25 | u64 utime, stime, utimescaled, stimescaled; |
0e0af57e | 26 | u64 now_ns, delta; |
2d602bf2 | 27 | time64_t btime; |
f3cef7a9 JL |
28 | |
29 | BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); | |
30 | ||
ccbf62d8 | 31 | /* calculate task elapsed time in nsec */ |
0e0af57e DTO |
32 | now_ns = ktime_get_ns(); |
33 | /* store whole group time first */ | |
34 | delta = now_ns - tsk->group_leader->start_time; | |
ccbf62d8 TG |
35 | /* Convert to micro seconds */ |
36 | do_div(delta, NSEC_PER_USEC); | |
0e0af57e DTO |
37 | stats->ac_tgetime = delta; |
38 | delta = now_ns - tsk->start_time; | |
39 | do_div(delta, NSEC_PER_USEC); | |
ccbf62d8 | 40 | stats->ac_etime = delta; |
2d602bf2 AB |
41 | /* Convert to seconds for btime (note y2106 limit) */ |
42 | btime = ktime_get_real_seconds() - div_u64(delta, USEC_PER_SEC); | |
43 | stats->ac_btime = clamp_t(time64_t, btime, 0, U32_MAX); | |
352c912b | 44 | stats->ac_btime64 = btime; |
2d602bf2 | 45 | |
1b5a42d9 | 46 | if (tsk->flags & PF_EXITING) |
f3cef7a9 | 47 | stats->ac_exitcode = tsk->exit_code; |
1b5a42d9 EB |
48 | if (thread_group_leader(tsk) && (tsk->flags & PF_FORKNOEXEC)) |
49 | stats->ac_flag |= AFORK; | |
f3cef7a9 JL |
50 | if (tsk->flags & PF_SUPERPRIV) |
51 | stats->ac_flag |= ASU; | |
52 | if (tsk->flags & PF_DUMPCORE) | |
53 | stats->ac_flag |= ACORE; | |
54 | if (tsk->flags & PF_SIGNALED) | |
55 | stats->ac_flag |= AXSIG; | |
56 | stats->ac_nice = task_nice(tsk); | |
57 | stats->ac_sched = tsk->policy; | |
4bd6e32a | 58 | stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); |
0e0af57e | 59 | stats->ac_tgid = task_tgid_nr_ns(tsk, pid_ns); |
05d5bcd6 | 60 | rcu_read_lock(); |
c69e8d9c | 61 | tcred = __task_cred(tsk); |
4bd6e32a EB |
62 | stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); |
63 | stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); | |
05d5bcd6 | 64 | stats->ac_ppid = pid_alive(tsk) ? |
4bd6e32a | 65 | task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; |
05d5bcd6 | 66 | rcu_read_unlock(); |
6fac4829 | 67 | |
605dc2b3 FW |
68 | task_cputime(tsk, &utime, &stime); |
69 | stats->ac_utime = div_u64(utime, NSEC_PER_USEC); | |
70 | stats->ac_stime = div_u64(stime, NSEC_PER_USEC); | |
6fac4829 | 71 | |
605dc2b3 FW |
72 | task_cputime_scaled(tsk, &utimescaled, &stimescaled); |
73 | stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC); | |
74 | stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC); | |
6fac4829 | 75 | |
f3cef7a9 JL |
76 | stats->ac_minflt = tsk->min_flt; |
77 | stats->ac_majflt = tsk->maj_flt; | |
f3cef7a9 JL |
78 | |
79 | strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); | |
80 | } | |
81 | ||
9acc1853 JL |
82 | |
83 | #ifdef CONFIG_TASK_XACCT | |
db5fed26 JL |
84 | |
85 | #define KB 1024 | |
86 | #define MB (1024*KB) | |
58c3c3aa | 87 | #define KB_MASK (~(KB-1)) |
9acc1853 JL |
88 | /* |
89 | * fill in extended accounting fields | |
90 | */ | |
91 | void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) | |
92 | { | |
f0ec1aaf ON |
93 | struct mm_struct *mm; |
94 | ||
382c2fe9 RR |
95 | /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */ |
96 | stats->coremem = p->acct_rss_mem1 * PAGE_SIZE; | |
97 | do_div(stats->coremem, 1000 * KB); | |
98 | stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE; | |
99 | do_div(stats->virtmem, 1000 * KB); | |
f0ec1aaf ON |
100 | mm = get_task_mm(p); |
101 | if (mm) { | |
db5fed26 | 102 | /* adjust to KB unit */ |
901608d9 ON |
103 | stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; |
104 | stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; | |
f0ec1aaf | 105 | mmput(mm); |
9acc1853 | 106 | } |
58c3c3aa LT |
107 | stats->read_char = p->ioac.rchar & KB_MASK; |
108 | stats->write_char = p->ioac.wchar & KB_MASK; | |
109 | stats->read_syscalls = p->ioac.syscr & KB_MASK; | |
110 | stats->write_syscalls = p->ioac.syscw & KB_MASK; | |
4a7864ca | 111 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
58c3c3aa LT |
112 | stats->read_bytes = p->ioac.read_bytes & KB_MASK; |
113 | stats->write_bytes = p->ioac.write_bytes & KB_MASK; | |
114 | stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; | |
4a7864ca AM |
115 | #else |
116 | stats->read_bytes = 0; | |
117 | stats->write_bytes = 0; | |
118 | stats->cancelled_write_bytes = 0; | |
119 | #endif | |
9acc1853 | 120 | } |
db5fed26 JL |
121 | #undef KB |
122 | #undef MB | |
8f0ab514 | 123 | |
6fac4829 | 124 | static void __acct_update_integrals(struct task_struct *tsk, |
605dc2b3 | 125 | u64 utime, u64 stime) |
8f0ab514 | 126 | { |
605dc2b3 | 127 | u64 time, delta; |
b2add86e RR |
128 | |
129 | if (!likely(tsk->mm)) | |
130 | return; | |
131 | ||
b2add86e | 132 | time = stime + utime; |
605dc2b3 | 133 | delta = time - tsk->acct_timexpd; |
b2add86e RR |
134 | |
135 | if (delta < TICK_NSEC) | |
9344c92c | 136 | return; |
b2add86e RR |
137 | |
138 | tsk->acct_timexpd = time; | |
139 | /* | |
140 | * Divide by 1024 to avoid overflow, and to avoid division. | |
141 | * The final unit reported to userspace is Mbyte-usecs, | |
142 | * the rest of the math is done in xacct_add_tsk. | |
143 | */ | |
144 | tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10; | |
7866076b | 145 | tsk->acct_vm_mem1 += delta * READ_ONCE(tsk->mm->total_vm) >> 10; |
8f0ab514 JL |
146 | } |
147 | ||
6fac4829 FW |
148 | /** |
149 | * acct_update_integrals - update mm integral fields in task_struct | |
150 | * @tsk: task_struct for accounting | |
151 | */ | |
152 | void acct_update_integrals(struct task_struct *tsk) | |
153 | { | |
605dc2b3 | 154 | u64 utime, stime; |
9344c92c | 155 | unsigned long flags; |
6fac4829 | 156 | |
9344c92c | 157 | local_irq_save(flags); |
605dc2b3 | 158 | task_cputime(tsk, &utime, &stime); |
6fac4829 | 159 | __acct_update_integrals(tsk, utime, stime); |
9344c92c | 160 | local_irq_restore(flags); |
6fac4829 FW |
161 | } |
162 | ||
163 | /** | |
164 | * acct_account_cputime - update mm integral after cputime update | |
165 | * @tsk: task_struct for accounting | |
166 | */ | |
167 | void acct_account_cputime(struct task_struct *tsk) | |
168 | { | |
169 | __acct_update_integrals(tsk, tsk->utime, tsk->stime); | |
170 | } | |
171 | ||
8f0ab514 JL |
172 | /** |
173 | * acct_clear_integrals - clear the mm integral fields in task_struct | |
174 | * @tsk: task_struct whose accounting fields are cleared | |
175 | */ | |
176 | void acct_clear_integrals(struct task_struct *tsk) | |
177 | { | |
49b5cf34 | 178 | tsk->acct_timexpd = 0; |
8f0ab514 JL |
179 | tsk->acct_rss_mem1 = 0; |
180 | tsk->acct_vm_mem1 = 0; | |
181 | } | |
9acc1853 | 182 | #endif |