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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 | */ | |
31 | void 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 | */ | |
94 | void 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 | ||
127 | static 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 | */ | |
155 | void 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 | */ | |
170 | void 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 | */ | |
179 | void 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 |