1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /*
3 * tsacct.c - System accounting over taskstats
4 *
5 * Copyright (C) Jay Lan, <jlan@sgi.com>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/sched/signal.h>
10 #include <linux/sched/mm.h>
11 #include <linux/sched/cputime.h>
12 #include <linux/tsacct_kern.h>
13 #include <linux/acct.h>
14 #include <linux/jiffies.h>
15 #include <linux/mm.h>
16
17 /*
18 * fill in basic accounting fields
19 */
20 void bacct_add_tsk(struct user_namespace *user
21 struct pid_namespace *pid_n
22 struct taskstats *stats, st
23 {
24 const struct cred *tcred;
25 u64 utime, stime, utimescaled, stimesc
26 u64 now_ns, delta;
27 time64_t btime;
28
29 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_L
30
31 /* calculate task elapsed time in nsec
32 now_ns = ktime_get_ns();
33 /* store whole group time first */
34 delta = now_ns - tsk->group_leader->st
35 /* Convert to micro seconds */
36 do_div(delta, NSEC_PER_USEC);
37 stats->ac_tgetime = delta;
38 delta = now_ns - tsk->start_time;
39 do_div(delta, NSEC_PER_USEC);
40 stats->ac_etime = delta;
41 /* Convert to seconds for btime (note
42 btime = ktime_get_real_seconds() - div
43 stats->ac_btime = clamp_t(time64_t, bt
44 stats->ac_btime64 = btime;
45
46 if (tsk->flags & PF_EXITING)
47 stats->ac_exitcode = tsk->exit
48 if (thread_group_leader(tsk) && (tsk->
49 stats->ac_flag |= AFORK;
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;
58 stats->ac_pid = task_pid_nr_ns(tsk,
59 stats->ac_tgid = task_tgid_nr_ns(tsk
60 rcu_read_lock();
61 tcred = __task_cred(tsk);
62 stats->ac_uid = from_kuid_munged(us
63 stats->ac_gid = from_kgid_munged(us
64 stats->ac_ppid = pid_alive(tsk) ?
65 task_tgid_nr_ns(rcu_dereferenc
66 rcu_read_unlock();
67
68 task_cputime(tsk, &utime, &stime);
69 stats->ac_utime = div_u64(utime, NSEC_
70 stats->ac_stime = div_u64(stime, NSEC_
71
72 task_cputime_scaled(tsk, &utimescaled,
73 stats->ac_utimescaled = div_u64(utimes
74 stats->ac_stimescaled = div_u64(stimes
75
76 stats->ac_minflt = tsk->min_flt;
77 stats->ac_majflt = tsk->maj_flt;
78
79 strscpy_pad(stats->ac_comm, tsk->comm)
80 }
81
82
83 #ifdef CONFIG_TASK_XACCT
84
85 #define KB 1024
86 #define MB (1024*KB)
87 #define KB_MASK (~(KB-1))
88 /*
89 * fill in extended accounting fields
90 */
91 void xacct_add_tsk(struct taskstats *stats, st
92 {
93 struct mm_struct *mm;
94
95 /* convert pages-nsec/1024 to Mbyte-us
96 stats->coremem = p->acct_rss_mem1 * PA
97 do_div(stats->coremem, 1000 * KB);
98 stats->virtmem = p->acct_vm_mem1 * PAG
99 do_div(stats->virtmem, 1000 * KB);
100 mm = get_task_mm(p);
101 if (mm) {
102 /* adjust to KB unit */
103 stats->hiwater_rss = get_mm_
104 stats->hiwater_vm = get_mm_
105 mmput(mm);
106 }
107 stats->read_char = p->ioac.rcha
108 stats->write_char = p->ioac.wcha
109 stats->read_syscalls = p->ioac.sysc
110 stats->write_syscalls = p->ioac.sysc
111 #ifdef CONFIG_TASK_IO_ACCOUNTING
112 stats->read_bytes = p->ioac.read
113 stats->write_bytes = p->ioac.writ
114 stats->cancelled_write_bytes = p->ioac
115 #else
116 stats->read_bytes = 0;
117 stats->write_bytes = 0;
118 stats->cancelled_write_bytes = 0;
119 #endif
120 }
121 #undef KB
122 #undef MB
123
124 static void __acct_update_integrals(struct tas
125 u64 utime,
126 {
127 u64 time, delta;
128
129 if (!likely(tsk->mm))
130 return;
131
132 time = stime + utime;
133 delta = time - tsk->acct_timexpd;
134
135 if (delta < TICK_NSEC)
136 return;
137
138 tsk->acct_timexpd = time;
139 /*
140 * Divide by 1024 to avoid overflow, a
141 * The final unit reported to userspac
142 * the rest of the math is done in xac
143 */
144 tsk->acct_rss_mem1 += delta * get_mm_r
145 tsk->acct_vm_mem1 += delta * READ_ONCE
146 }
147
148 /**
149 * acct_update_integrals - update mm integral
150 * @tsk: task_struct for accounting
151 */
152 void acct_update_integrals(struct task_struct
153 {
154 u64 utime, stime;
155 unsigned long flags;
156
157 local_irq_save(flags);
158 task_cputime(tsk, &utime, &stime);
159 __acct_update_integrals(tsk, utime, st
160 local_irq_restore(flags);
161 }
162
163 /**
164 * acct_account_cputime - update mm integral a
165 * @tsk: task_struct for accounting
166 */
167 void acct_account_cputime(struct task_struct *
168 {
169 __acct_update_integrals(tsk, tsk->utim
170 }
171
172 /**
173 * acct_clear_integrals - clear the mm integra
174 * @tsk: task_struct whose accounting fields a
175 */
176 void acct_clear_integrals(struct task_struct *
177 {
178 tsk->acct_timexpd = 0;
179 tsk->acct_rss_mem1 = 0;
180 tsk->acct_vm_mem1 = 0;
181 }
182 #endif
183
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