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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 taskstats *stats, struct task_struct *tsk) | |
30 | { | |
31 | const struct cred *tcred; | |
32 | struct timespec uptime, ts; | |
33 | u64 ac_etime; | |
34 | ||
35 | BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); | |
36 | ||
37 | /* calculate task elapsed time in timespec */ | |
38 | do_posix_clock_monotonic_gettime(&uptime); | |
39 | ts = timespec_sub(uptime, tsk->start_time); | |
40 | /* rebase elapsed time to usec (should never be negative) */ | |
41 | ac_etime = timespec_to_ns(&ts); | |
42 | do_div(ac_etime, NSEC_PER_USEC); | |
43 | stats->ac_etime = ac_etime; | |
44 | stats->ac_btime = get_seconds() - ts.tv_sec; | |
45 | if (thread_group_leader(tsk)) { | |
46 | stats->ac_exitcode = tsk->exit_code; | |
47 | if (tsk->flags & PF_FORKNOEXEC) | |
48 | stats->ac_flag |= AFORK; | |
49 | } | |
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 = tsk->pid; | |
59 | rcu_read_lock(); | |
60 | tcred = __task_cred(tsk); | |
61 | stats->ac_uid = tcred->uid; | |
62 | stats->ac_gid = tcred->gid; | |
63 | stats->ac_ppid = pid_alive(tsk) ? | |
64 | rcu_dereference(tsk->real_parent)->tgid : 0; | |
65 | rcu_read_unlock(); | |
66 | stats->ac_utime = cputime_to_usecs(tsk->utime); | |
67 | stats->ac_stime = cputime_to_usecs(tsk->stime); | |
68 | stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled); | |
69 | stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled); | |
70 | stats->ac_minflt = tsk->min_flt; | |
71 | stats->ac_majflt = tsk->maj_flt; | |
72 | ||
73 | strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); | |
74 | } | |
75 | ||
76 | ||
77 | #ifdef CONFIG_TASK_XACCT | |
78 | ||
79 | #define KB 1024 | |
80 | #define MB (1024*KB) | |
81 | /* | |
82 | * fill in extended accounting fields | |
83 | */ | |
84 | void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) | |
85 | { | |
86 | struct mm_struct *mm; | |
87 | ||
88 | /* convert pages-usec to Mbyte-usec */ | |
89 | stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB; | |
90 | stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB; | |
91 | mm = get_task_mm(p); | |
92 | if (mm) { | |
93 | /* adjust to KB unit */ | |
94 | stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; | |
95 | stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; | |
96 | mmput(mm); | |
97 | } | |
98 | stats->read_char = p->ioac.rchar; | |
99 | stats->write_char = p->ioac.wchar; | |
100 | stats->read_syscalls = p->ioac.syscr; | |
101 | stats->write_syscalls = p->ioac.syscw; | |
102 | #ifdef CONFIG_TASK_IO_ACCOUNTING | |
103 | stats->read_bytes = p->ioac.read_bytes; | |
104 | stats->write_bytes = p->ioac.write_bytes; | |
105 | stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes; | |
106 | #else | |
107 | stats->read_bytes = 0; | |
108 | stats->write_bytes = 0; | |
109 | stats->cancelled_write_bytes = 0; | |
110 | #endif | |
111 | } | |
112 | #undef KB | |
113 | #undef MB | |
114 | ||
115 | /** | |
116 | * acct_update_integrals - update mm integral fields in task_struct | |
117 | * @tsk: task_struct for accounting | |
118 | */ | |
119 | void acct_update_integrals(struct task_struct *tsk) | |
120 | { | |
121 | if (likely(tsk->mm)) { | |
122 | cputime_t time, dtime; | |
123 | struct timeval value; | |
124 | unsigned long flags; | |
125 | u64 delta; | |
126 | ||
127 | local_irq_save(flags); | |
128 | time = tsk->stime + tsk->utime; | |
129 | dtime = cputime_sub(time, tsk->acct_timexpd); | |
130 | jiffies_to_timeval(cputime_to_jiffies(dtime), &value); | |
131 | delta = value.tv_sec; | |
132 | delta = delta * USEC_PER_SEC + value.tv_usec; | |
133 | ||
134 | if (delta == 0) | |
135 | goto out; | |
136 | tsk->acct_timexpd = time; | |
137 | tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); | |
138 | tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; | |
139 | out: | |
140 | local_irq_restore(flags); | |
141 | } | |
142 | } | |
143 | ||
144 | /** | |
145 | * acct_clear_integrals - clear the mm integral fields in task_struct | |
146 | * @tsk: task_struct whose accounting fields are cleared | |
147 | */ | |
148 | void acct_clear_integrals(struct task_struct *tsk) | |
149 | { | |
150 | tsk->acct_timexpd = 0; | |
151 | tsk->acct_rss_mem1 = 0; | |
152 | tsk->acct_vm_mem1 = 0; | |
153 | } | |
154 | #endif |