Line data Source code
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 0 : 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 : cputime_t utime, stime, utimescaled, stimescaled;
35 : u64 delta;
36 :
37 : BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
38 :
39 : /* calculate task elapsed time in nsec */
40 0 : delta = ktime_get_ns() - tsk->start_time;
41 : /* Convert to micro seconds */
42 0 : do_div(delta, NSEC_PER_USEC);
43 0 : stats->ac_etime = delta;
44 : /* Convert to seconds for btime */
45 0 : do_div(delta, USEC_PER_SEC);
46 0 : stats->ac_btime = get_seconds() - delta;
47 0 : if (thread_group_leader(tsk)) {
48 0 : stats->ac_exitcode = tsk->exit_code;
49 0 : if (tsk->flags & PF_FORKNOEXEC)
50 0 : stats->ac_flag |= AFORK;
51 : }
52 0 : if (tsk->flags & PF_SUPERPRIV)
53 0 : stats->ac_flag |= ASU;
54 0 : if (tsk->flags & PF_DUMPCORE)
55 0 : stats->ac_flag |= ACORE;
56 0 : if (tsk->flags & PF_SIGNALED)
57 0 : stats->ac_flag |= AXSIG;
58 0 : stats->ac_nice = task_nice(tsk);
59 0 : stats->ac_sched = tsk->policy;
60 0 : stats->ac_pid = task_pid_nr_ns(tsk, pid_ns);
61 : rcu_read_lock();
62 0 : tcred = __task_cred(tsk);
63 0 : stats->ac_uid = from_kuid_munged(user_ns, tcred->uid);
64 0 : stats->ac_gid = from_kgid_munged(user_ns, tcred->gid);
65 0 : stats->ac_ppid = pid_alive(tsk) ?
66 0 : task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
67 : rcu_read_unlock();
68 :
69 : task_cputime(tsk, &utime, &stime);
70 0 : stats->ac_utime = cputime_to_usecs(utime);
71 0 : stats->ac_stime = cputime_to_usecs(stime);
72 :
73 : task_cputime_scaled(tsk, &utimescaled, &stimescaled);
74 0 : stats->ac_utimescaled = cputime_to_usecs(utimescaled);
75 0 : stats->ac_stimescaled = cputime_to_usecs(stimescaled);
76 :
77 0 : stats->ac_minflt = tsk->min_flt;
78 0 : stats->ac_majflt = tsk->maj_flt;
79 :
80 0 : strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
81 0 : }
82 :
83 :
84 : #ifdef CONFIG_TASK_XACCT
85 :
86 : #define KB 1024
87 : #define MB (1024*KB)
88 : #define KB_MASK (~(KB-1))
89 : /*
90 : * fill in extended accounting fields
91 : */
92 0 : void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
93 : {
94 0 : struct mm_struct *mm;
95 :
96 : /* convert pages-usec to Mbyte-usec */
97 0 : stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
98 0 : stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
99 0 : mm = get_task_mm(p);
100 0 : if (mm) {
101 : /* adjust to KB unit */
102 0 : stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
103 0 : stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
104 0 : mmput(mm);
105 : }
106 0 : stats->read_char = p->ioac.rchar & KB_MASK;
107 0 : stats->write_char = p->ioac.wchar & KB_MASK;
108 0 : stats->read_syscalls = p->ioac.syscr & KB_MASK;
109 0 : stats->write_syscalls = p->ioac.syscw & KB_MASK;
110 : #ifdef CONFIG_TASK_IO_ACCOUNTING
111 0 : stats->read_bytes = p->ioac.read_bytes & KB_MASK;
112 0 : stats->write_bytes = p->ioac.write_bytes & KB_MASK;
113 0 : stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
114 : #else
115 : stats->read_bytes = 0;
116 : stats->write_bytes = 0;
117 : stats->cancelled_write_bytes = 0;
118 : #endif
119 0 : }
120 : #undef KB
121 : #undef MB
122 :
123 144172 : static void __acct_update_integrals(struct task_struct *tsk,
124 : cputime_t utime, cputime_t stime)
125 : {
126 144172 : if (likely(tsk->mm)) {
127 : cputime_t time, dtime;
128 : struct timeval value;
129 : unsigned long flags;
130 : u64 delta;
131 :
132 : local_irq_save(flags);
133 138711 : time = stime + utime;
134 138711 : dtime = time - tsk->acct_timexpd;
135 138711 : jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
136 138711 : delta = value.tv_sec;
137 138711 : delta = delta * USEC_PER_SEC + value.tv_usec;
138 :
139 138711 : if (delta == 0)
140 : goto out;
141 133684 : tsk->acct_timexpd = time;
142 267368 : tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
143 133684 : tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
144 : out:
145 138711 : local_irq_restore(flags);
146 : }
147 144172 : }
148 :
149 : /**
150 : * acct_update_integrals - update mm integral fields in task_struct
151 : * @tsk: task_struct for accounting
152 : */
153 5063 : void acct_update_integrals(struct task_struct *tsk)
154 : {
155 : cputime_t utime, stime;
156 :
157 : task_cputime(tsk, &utime, &stime);
158 5063 : __acct_update_integrals(tsk, utime, stime);
159 5063 : }
160 :
161 : /**
162 : * acct_account_cputime - update mm integral after cputime update
163 : * @tsk: task_struct for accounting
164 : */
165 139109 : void acct_account_cputime(struct task_struct *tsk)
166 : {
167 139109 : __acct_update_integrals(tsk, tsk->utime, tsk->stime);
168 139109 : }
169 :
170 : /**
171 : * acct_clear_integrals - clear the mm integral fields in task_struct
172 : * @tsk: task_struct whose accounting fields are cleared
173 : */
174 2993 : void acct_clear_integrals(struct task_struct *tsk)
175 : {
176 2993 : tsk->acct_timexpd = 0;
177 2993 : tsk->acct_rss_mem1 = 0;
178 2993 : tsk->acct_vm_mem1 = 0;
179 2993 : }
180 : #endif
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