Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-or-later
2 : /*
3 : * tsacct.c - System accounting over taskstats interface
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 0 : void bacct_add_tsk(struct user_namespace *user_ns,
21 : struct pid_namespace *pid_ns,
22 : struct taskstats *stats, struct task_struct *tsk)
23 : {
24 0 : const struct cred *tcred;
25 0 : u64 utime, stime, utimescaled, stimescaled;
26 0 : u64 delta;
27 0 : time64_t btime;
28 :
29 0 : BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
30 :
31 : /* calculate task elapsed time in nsec */
32 0 : delta = ktime_get_ns() - tsk->start_time;
33 : /* Convert to micro seconds */
34 0 : do_div(delta, NSEC_PER_USEC);
35 0 : stats->ac_etime = delta;
36 : /* Convert to seconds for btime (note y2106 limit) */
37 0 : btime = ktime_get_real_seconds() - div_u64(delta, USEC_PER_SEC);
38 0 : stats->ac_btime = clamp_t(time64_t, btime, 0, U32_MAX);
39 0 : stats->ac_btime64 = btime;
40 :
41 0 : if (thread_group_leader(tsk)) {
42 0 : stats->ac_exitcode = tsk->exit_code;
43 0 : if (tsk->flags & PF_FORKNOEXEC)
44 0 : stats->ac_flag |= AFORK;
45 : }
46 0 : if (tsk->flags & PF_SUPERPRIV)
47 0 : stats->ac_flag |= ASU;
48 0 : if (tsk->flags & PF_DUMPCORE)
49 0 : stats->ac_flag |= ACORE;
50 0 : if (tsk->flags & PF_SIGNALED)
51 0 : stats->ac_flag |= AXSIG;
52 0 : stats->ac_nice = task_nice(tsk);
53 0 : stats->ac_sched = tsk->policy;
54 0 : stats->ac_pid = task_pid_nr_ns(tsk, pid_ns);
55 0 : rcu_read_lock();
56 0 : tcred = __task_cred(tsk);
57 0 : stats->ac_uid = from_kuid_munged(user_ns, tcred->uid);
58 0 : stats->ac_gid = from_kgid_munged(user_ns, tcred->gid);
59 0 : stats->ac_ppid = pid_alive(tsk) ?
60 0 : task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
61 0 : rcu_read_unlock();
62 :
63 0 : task_cputime(tsk, &utime, &stime);
64 0 : stats->ac_utime = div_u64(utime, NSEC_PER_USEC);
65 0 : stats->ac_stime = div_u64(stime, NSEC_PER_USEC);
66 :
67 0 : task_cputime_scaled(tsk, &utimescaled, &stimescaled);
68 0 : stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC);
69 0 : stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC);
70 :
71 0 : stats->ac_minflt = tsk->min_flt;
72 0 : stats->ac_majflt = tsk->maj_flt;
73 :
74 0 : strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
75 0 : }
76 :
77 :
78 : #ifdef CONFIG_TASK_XACCT
79 :
80 : #define KB 1024
81 : #define MB (1024*KB)
82 : #define KB_MASK (~(KB-1))
83 : /*
84 : * fill in extended accounting fields
85 : */
86 0 : void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
87 : {
88 0 : struct mm_struct *mm;
89 :
90 : /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */
91 0 : stats->coremem = p->acct_rss_mem1 * PAGE_SIZE;
92 0 : do_div(stats->coremem, 1000 * KB);
93 0 : stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE;
94 0 : do_div(stats->virtmem, 1000 * KB);
95 0 : mm = get_task_mm(p);
96 0 : if (mm) {
97 : /* adjust to KB unit */
98 0 : stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
99 0 : stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
100 0 : mmput(mm);
101 : }
102 0 : stats->read_char = p->ioac.rchar & KB_MASK;
103 0 : stats->write_char = p->ioac.wchar & KB_MASK;
104 0 : stats->read_syscalls = p->ioac.syscr & KB_MASK;
105 0 : stats->write_syscalls = p->ioac.syscw & KB_MASK;
106 : #ifdef CONFIG_TASK_IO_ACCOUNTING
107 0 : stats->read_bytes = p->ioac.read_bytes & KB_MASK;
108 0 : stats->write_bytes = p->ioac.write_bytes & KB_MASK;
109 0 : stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
110 : #else
111 : stats->read_bytes = 0;
112 : stats->write_bytes = 0;
113 : stats->cancelled_write_bytes = 0;
114 : #endif
115 0 : }
116 : #undef KB
117 : #undef MB
118 :
119 19349 : static void __acct_update_integrals(struct task_struct *tsk,
120 : u64 utime, u64 stime)
121 : {
122 19349 : u64 time, delta;
123 :
124 19349 : if (!likely(tsk->mm))
125 : return;
126 :
127 14804 : time = stime + utime;
128 14804 : delta = time - tsk->acct_timexpd;
129 :
130 14804 : if (delta < TICK_NSEC)
131 : return;
132 :
133 10725 : tsk->acct_timexpd = time;
134 : /*
135 : * Divide by 1024 to avoid overflow, and to avoid division.
136 : * The final unit reported to userspace is Mbyte-usecs,
137 : * the rest of the math is done in xacct_add_tsk.
138 : */
139 10725 : tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10;
140 10732 : tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10;
141 : }
142 :
143 : /**
144 : * acct_update_integrals - update mm integral fields in task_struct
145 : * @tsk: task_struct for accounting
146 : */
147 1933 : void acct_update_integrals(struct task_struct *tsk)
148 : {
149 1933 : u64 utime, stime;
150 1933 : unsigned long flags;
151 :
152 3866 : local_irq_save(flags);
153 1933 : task_cputime(tsk, &utime, &stime);
154 1933 : __acct_update_integrals(tsk, utime, stime);
155 1933 : local_irq_restore(flags);
156 1933 : }
157 :
158 : /**
159 : * acct_account_cputime - update mm integral after cputime update
160 : * @tsk: task_struct for accounting
161 : */
162 17358 : void acct_account_cputime(struct task_struct *tsk)
163 : {
164 17358 : __acct_update_integrals(tsk, tsk->utime, tsk->stime);
165 17578 : }
166 :
167 : /**
168 : * acct_clear_integrals - clear the mm integral fields in task_struct
169 : * @tsk: task_struct whose accounting fields are cleared
170 : */
171 1188 : void acct_clear_integrals(struct task_struct *tsk)
172 : {
173 1188 : tsk->acct_timexpd = 0;
174 1188 : tsk->acct_rss_mem1 = 0;
175 1188 : tsk->acct_vm_mem1 = 0;
176 1188 : }
177 : #endif
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