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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.h> |
21 | #include <linux/tsacct_kern.h> |
22 | #include <linux/acct.h> |
23 | #include <linux/jiffies.h> |
24 | #include <linux/mm.h> |
25 | |
26 | /* |
27 | * fill in basic accounting fields |
28 | */ |
29 | void bacct_add_tsk(struct user_namespace *user_ns, |
30 | struct pid_namespace *pid_ns, |
31 | struct taskstats *stats, struct task_struct *tsk) |
32 | { |
33 | const struct cred *tcred; |
34 | struct timespec uptime, ts; |
35 | cputime_t utime, stime, utimescaled, stimescaled; |
36 | u64 ac_etime; |
37 | |
38 | BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); |
39 | |
40 | /* calculate task elapsed time in timespec */ |
41 | do_posix_clock_monotonic_gettime(&uptime); |
42 | ts = timespec_sub(uptime, tsk->start_time); |
43 | /* rebase elapsed time to usec (should never be negative) */ |
44 | ac_etime = timespec_to_ns(&ts); |
45 | do_div(ac_etime, NSEC_PER_USEC); |
46 | stats->ac_etime = ac_etime; |
47 | stats->ac_btime = get_seconds() - ts.tv_sec; |
48 | if (thread_group_leader(tsk)) { |
49 | stats->ac_exitcode = tsk->exit_code; |
50 | if (tsk->flags & PF_FORKNOEXEC) |
51 | stats->ac_flag |= AFORK; |
52 | } |
53 | if (tsk->flags & PF_SUPERPRIV) |
54 | stats->ac_flag |= ASU; |
55 | if (tsk->flags & PF_DUMPCORE) |
56 | stats->ac_flag |= ACORE; |
57 | if (tsk->flags & PF_SIGNALED) |
58 | stats->ac_flag |= AXSIG; |
59 | stats->ac_nice = task_nice(tsk); |
60 | stats->ac_sched = tsk->policy; |
61 | stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); |
62 | rcu_read_lock(); |
63 | tcred = __task_cred(tsk); |
64 | stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); |
65 | stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); |
66 | stats->ac_ppid = pid_alive(tsk) ? |
67 | task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; |
68 | rcu_read_unlock(); |
69 | |
70 | task_cputime(tsk, &utime, &stime); |
71 | stats->ac_utime = cputime_to_usecs(utime); |
72 | stats->ac_stime = cputime_to_usecs(stime); |
73 | |
74 | task_cputime_scaled(tsk, &utimescaled, &stimescaled); |
75 | stats->ac_utimescaled = cputime_to_usecs(utimescaled); |
76 | stats->ac_stimescaled = cputime_to_usecs(stimescaled); |
77 | |
78 | stats->ac_minflt = tsk->min_flt; |
79 | stats->ac_majflt = tsk->maj_flt; |
80 | |
81 | strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); |
82 | } |
83 | |
84 | |
85 | #ifdef CONFIG_TASK_XACCT |
86 | |
87 | #define KB 1024 |
88 | #define MB (1024*KB) |
89 | #define KB_MASK (~(KB-1)) |
90 | /* |
91 | * fill in extended accounting fields |
92 | */ |
93 | void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) |
94 | { |
95 | struct mm_struct *mm; |
96 | |
97 | /* convert pages-usec to Mbyte-usec */ |
98 | stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB; |
99 | stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB; |
100 | mm = get_task_mm(p); |
101 | if (mm) { |
102 | /* adjust to KB unit */ |
103 | stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; |
104 | stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; |
105 | mmput(mm); |
106 | } |
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; |
111 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
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; |
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 task_struct *tsk, |
125 | cputime_t utime, cputime_t stime) |
126 | { |
127 | if (likely(tsk->mm)) { |
128 | cputime_t time, dtime; |
129 | struct timeval value; |
130 | unsigned long flags; |
131 | u64 delta; |
132 | |
133 | local_irq_save(flags); |
134 | time = stime + utime; |
135 | dtime = time - tsk->acct_timexpd; |
136 | jiffies_to_timeval(cputime_to_jiffies(dtime), &value); |
137 | delta = value.tv_sec; |
138 | delta = delta * USEC_PER_SEC + value.tv_usec; |
139 | |
140 | if (delta == 0) |
141 | goto out; |
142 | tsk->acct_timexpd = time; |
143 | tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); |
144 | tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; |
145 | out: |
146 | local_irq_restore(flags); |
147 | } |
148 | } |
149 | |
150 | /** |
151 | * acct_update_integrals - update mm integral fields in task_struct |
152 | * @tsk: task_struct for accounting |
153 | */ |
154 | void acct_update_integrals(struct task_struct *tsk) |
155 | { |
156 | cputime_t utime, stime; |
157 | |
158 | task_cputime(tsk, &utime, &stime); |
159 | __acct_update_integrals(tsk, utime, stime); |
160 | } |
161 | |
162 | /** |
163 | * acct_account_cputime - update mm integral after cputime update |
164 | * @tsk: task_struct for accounting |
165 | */ |
166 | void acct_account_cputime(struct task_struct *tsk) |
167 | { |
168 | __acct_update_integrals(tsk, tsk->utime, tsk->stime); |
169 | } |
170 | |
171 | /** |
172 | * acct_clear_integrals - clear the mm integral fields in task_struct |
173 | * @tsk: task_struct whose accounting fields are cleared |
174 | */ |
175 | void acct_clear_integrals(struct task_struct *tsk) |
176 | { |
177 | tsk->acct_timexpd = 0; |
178 | tsk->acct_rss_mem1 = 0; |
179 | tsk->acct_vm_mem1 = 0; |
180 | } |
181 | #endif |
182 |
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