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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 |
155 |
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