projects/linux·blob v4.6 · refs

186 lines · 5.1 KiB

1/*
2 * tsacct.c - System accounting over taskstats interface
3 *
4 * Copyright (C) Jay Lan, <[email protected]>
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 */
29void 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 */
92void 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
125static 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 */
156void 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 */
171void 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 */
180void 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