blob: f8e26ab963ed2fc057db395bee59d6f25307b5d5
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 | 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 | delta = ktime_get_ns() - tsk->start_time; |
41 | /* Convert to micro seconds */ |
42 | do_div(delta, NSEC_PER_USEC); |
43 | stats->ac_etime = delta; |
44 | /* Convert to seconds for btime */ |
45 | do_div(delta, USEC_PER_SEC); |
46 | stats->ac_btime = get_seconds() - delta; |
47 | if (thread_group_leader(tsk)) { |
48 | stats->ac_exitcode = tsk->exit_code; |
49 | if (tsk->flags & PF_FORKNOEXEC) |
50 | stats->ac_flag |= AFORK; |
51 | } |
52 | if (tsk->flags & PF_SUPERPRIV) |
53 | stats->ac_flag |= ASU; |
54 | if (tsk->flags & PF_DUMPCORE) |
55 | stats->ac_flag |= ACORE; |
56 | if (tsk->flags & PF_SIGNALED) |
57 | stats->ac_flag |= AXSIG; |
58 | stats->ac_nice = task_nice(tsk); |
59 | stats->ac_sched = tsk->policy; |
60 | stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); |
61 | rcu_read_lock(); |
62 | tcred = __task_cred(tsk); |
63 | stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); |
64 | stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); |
65 | stats->ac_ppid = pid_alive(tsk) ? |
66 | task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; |
67 | rcu_read_unlock(); |
68 | |
69 | task_cputime(tsk, &utime, &stime); |
70 | stats->ac_utime = cputime_to_usecs(utime); |
71 | stats->ac_stime = cputime_to_usecs(stime); |
72 | |
73 | task_cputime_scaled(tsk, &utimescaled, &stimescaled); |
74 | stats->ac_utimescaled = cputime_to_usecs(utimescaled); |
75 | stats->ac_stimescaled = cputime_to_usecs(stimescaled); |
76 | |
77 | stats->ac_minflt = tsk->min_flt; |
78 | stats->ac_majflt = tsk->maj_flt; |
79 | |
80 | strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); |
81 | } |
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 | void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) |
93 | { |
94 | struct mm_struct *mm; |
95 | |
96 | /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */ |
97 | stats->coremem = p->acct_rss_mem1 * PAGE_SIZE; |
98 | do_div(stats->coremem, 1000 * KB); |
99 | stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE; |
100 | do_div(stats->virtmem, 1000 * KB); |
101 | mm = get_task_mm(p); |
102 | if (mm) { |
103 | /* adjust to KB unit */ |
104 | stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; |
105 | stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; |
106 | mmput(mm); |
107 | } |
108 | stats->read_char = p->ioac.rchar & KB_MASK; |
109 | stats->write_char = p->ioac.wchar & KB_MASK; |
110 | stats->read_syscalls = p->ioac.syscr & KB_MASK; |
111 | stats->write_syscalls = p->ioac.syscw & KB_MASK; |
112 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
113 | stats->read_bytes = p->ioac.read_bytes & KB_MASK; |
114 | stats->write_bytes = p->ioac.write_bytes & KB_MASK; |
115 | stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; |
116 | #else |
117 | stats->read_bytes = 0; |
118 | stats->write_bytes = 0; |
119 | stats->cancelled_write_bytes = 0; |
120 | #endif |
121 | } |
122 | #undef KB |
123 | #undef MB |
124 | |
125 | static void __acct_update_integrals(struct task_struct *tsk, |
126 | cputime_t utime, cputime_t stime) |
127 | { |
128 | cputime_t time, dtime; |
129 | u64 delta; |
130 | |
131 | if (!likely(tsk->mm)) |
132 | return; |
133 | |
134 | time = stime + utime; |
135 | dtime = time - tsk->acct_timexpd; |
136 | /* Avoid division: cputime_t is often in nanoseconds already. */ |
137 | delta = cputime_to_nsecs(dtime); |
138 | |
139 | if (delta < TICK_NSEC) |
140 | return; |
141 | |
142 | tsk->acct_timexpd = time; |
143 | /* |
144 | * Divide by 1024 to avoid overflow, and to avoid division. |
145 | * The final unit reported to userspace is Mbyte-usecs, |
146 | * the rest of the math is done in xacct_add_tsk. |
147 | */ |
148 | tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10; |
149 | tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10; |
150 | } |
151 | |
152 | /** |
153 | * acct_update_integrals - update mm integral fields in task_struct |
154 | * @tsk: task_struct for accounting |
155 | */ |
156 | void acct_update_integrals(struct task_struct *tsk) |
157 | { |
158 | cputime_t utime, stime; |
159 | unsigned long flags; |
160 | |
161 | local_irq_save(flags); |
162 | task_cputime(tsk, &utime, &stime); |
163 | __acct_update_integrals(tsk, utime, stime); |
164 | local_irq_restore(flags); |
165 | } |
166 | |
167 | /** |
168 | * acct_account_cputime - update mm integral after cputime update |
169 | * @tsk: task_struct for accounting |
170 | */ |
171 | void acct_account_cputime(struct task_struct *tsk) |
172 | { |
173 | __acct_update_integrals(tsk, tsk->utime, tsk->stime); |
174 | } |
175 | |
176 | /** |
177 | * acct_clear_integrals - clear the mm integral fields in task_struct |
178 | * @tsk: task_struct whose accounting fields are cleared |
179 | */ |
180 | void acct_clear_integrals(struct task_struct *tsk) |
181 | { |
182 | tsk->acct_timexpd = 0; |
183 | tsk->acct_rss_mem1 = 0; |
184 | tsk->acct_vm_mem1 = 0; |
185 | } |
186 | #endif |
187 |