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
25 /*
26 * fill in basic accounting fields
27 */
28 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
29 {
30 struct timespec uptime, ts;
31 s64 ac_etime;
32
33 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
34
35 /* calculate task elapsed time in timespec */
36 do_posix_clock_monotonic_gettime(&uptime);
37 ts = timespec_sub(uptime, tsk->start_time);
38 /* rebase elapsed time to usec */
39 ac_etime = timespec_to_ns(&ts);
40 do_div(ac_etime, NSEC_PER_USEC);
41 stats->ac_etime = ac_etime;
42 stats->ac_btime = get_seconds() - ts.tv_sec;
43 if (thread_group_leader(tsk)) {
44 stats->ac_exitcode = tsk->exit_code;
45 if (tsk->flags & PF_FORKNOEXEC)
46 stats->ac_flag |= AFORK;
47 }
48 if (tsk->flags & PF_SUPERPRIV)
49 stats->ac_flag |= ASU;
50 if (tsk->flags & PF_DUMPCORE)
51 stats->ac_flag |= ACORE;
52 if (tsk->flags & PF_SIGNALED)
53 stats->ac_flag |= AXSIG;
54 stats->ac_nice = task_nice(tsk);
55 stats->ac_sched = tsk->policy;
56 stats->ac_uid = tsk->uid;
57 stats->ac_gid = tsk->gid;
58 stats->ac_pid = tsk->pid;
59 rcu_read_lock();
60 stats->ac_ppid = pid_alive(tsk) ?
61 rcu_dereference(tsk->real_parent)->tgid : 0;
62 rcu_read_unlock();
63 stats->ac_utime = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;
64 stats->ac_stime = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;
65 stats->ac_utimescaled =
66 cputime_to_msecs(tsk->utimescaled) * USEC_PER_MSEC;
67 stats->ac_stimescaled =
68 cputime_to_msecs(tsk->stimescaled) * USEC_PER_MSEC;
69 stats->ac_minflt = tsk->min_flt;
70 stats->ac_majflt = tsk->maj_flt;
71
72 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
73 }
74
75
76 #ifdef CONFIG_TASK_XACCT
77
78 #define KB 1024
79 #define MB (1024*KB)
80 /*
81 * fill in extended accounting fields
82 */
83 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
84 {
85 struct mm_struct *mm;
86
87 /* convert pages-jiffies to Mbyte-usec */
88 stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;
89 stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;
90 mm = get_task_mm(p);
91 if (mm) {
92 /* adjust to KB unit */
93 stats->hiwater_rss = mm->hiwater_rss * PAGE_SIZE / KB;
94 stats->hiwater_vm = mm->hiwater_vm * PAGE_SIZE / KB;
95 mmput(mm);
96 }
97 stats->read_char = p->rchar;
98 stats->write_char = p->wchar;
99 stats->read_syscalls = p->syscr;
100 stats->write_syscalls = p->syscw;
101 #ifdef CONFIG_TASK_IO_ACCOUNTING
102 stats->read_bytes = p->ioac.read_bytes;
103 stats->write_bytes = p->ioac.write_bytes;
104 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
105 #else
106 stats->read_bytes = 0;
107 stats->write_bytes = 0;
108 stats->cancelled_write_bytes = 0;
109 #endif
110 }
111 #undef KB
112 #undef MB
113
114 /**
115 * acct_update_integrals - update mm integral fields in task_struct
116 * @tsk: task_struct for accounting
117 */
118 void acct_update_integrals(struct task_struct *tsk)
119 {
120 if (likely(tsk->mm)) {
121 long delta = cputime_to_jiffies(
122 cputime_sub(tsk->stime, tsk->acct_stimexpd));
123
124 if (delta == 0)
125 return;
126 tsk->acct_stimexpd = tsk->stime;
127 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
128 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
129 }
130 }
131
132 /**
133 * acct_clear_integrals - clear the mm integral fields in task_struct
134 * @tsk: task_struct whose accounting fields are cleared
135 */
136 void acct_clear_integrals(struct task_struct *tsk)
137 {
138 tsk->acct_stimexpd = 0;
139 tsk->acct_rss_mem1 = 0;
140 tsk->acct_vm_mem1 = 0;
141 }
142 #endif
143
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