Root/kernel/tsacct.c

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 */
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    struct timespec uptime, ts;
35    cputime_t utime, stime, utimescaled, stimescaled;
36    u64 ac_etime;
37
38    BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
39
40    /* calculate task elapsed time in timespec */
41    do_posix_clock_monotonic_gettime(&uptime);
42    ts = timespec_sub(uptime, tsk->start_time);
43    /* rebase elapsed time to usec (should never be negative) */
44    ac_etime = timespec_to_ns(&ts);
45    do_div(ac_etime, NSEC_PER_USEC);
46    stats->ac_etime = ac_etime;
47    stats->ac_btime = get_seconds() - ts.tv_sec;
48    if (thread_group_leader(tsk)) {
49        stats->ac_exitcode = tsk->exit_code;
50        if (tsk->flags & PF_FORKNOEXEC)
51            stats->ac_flag |= AFORK;
52    }
53    if (tsk->flags & PF_SUPERPRIV)
54        stats->ac_flag |= ASU;
55    if (tsk->flags & PF_DUMPCORE)
56        stats->ac_flag |= ACORE;
57    if (tsk->flags & PF_SIGNALED)
58        stats->ac_flag |= AXSIG;
59    stats->ac_nice = task_nice(tsk);
60    stats->ac_sched = tsk->policy;
61    stats->ac_pid = task_pid_nr_ns(tsk, pid_ns);
62    rcu_read_lock();
63    tcred = __task_cred(tsk);
64    stats->ac_uid = from_kuid_munged(user_ns, tcred->uid);
65    stats->ac_gid = from_kgid_munged(user_ns, tcred->gid);
66    stats->ac_ppid = pid_alive(tsk) ?
67        task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
68    rcu_read_unlock();
69
70    task_cputime(tsk, &utime, &stime);
71    stats->ac_utime = cputime_to_usecs(utime);
72    stats->ac_stime = cputime_to_usecs(stime);
73
74    task_cputime_scaled(tsk, &utimescaled, &stimescaled);
75    stats->ac_utimescaled = cputime_to_usecs(utimescaled);
76    stats->ac_stimescaled = cputime_to_usecs(stimescaled);
77
78    stats->ac_minflt = tsk->min_flt;
79    stats->ac_majflt = tsk->maj_flt;
80
81    strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
82}
83
84
85#ifdef CONFIG_TASK_XACCT
86
87#define KB 1024
88#define MB (1024*KB)
89#define KB_MASK (~(KB-1))
90/*
91 * fill in extended accounting fields
92 */
93void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
94{
95    struct mm_struct *mm;
96
97    /* convert pages-usec to Mbyte-usec */
98    stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
99    stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
100    mm = get_task_mm(p);
101    if (mm) {
102        /* adjust to KB unit */
103        stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
104        stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
105        mmput(mm);
106    }
107    stats->read_char = p->ioac.rchar & KB_MASK;
108    stats->write_char = p->ioac.wchar & KB_MASK;
109    stats->read_syscalls = p->ioac.syscr & KB_MASK;
110    stats->write_syscalls = p->ioac.syscw & KB_MASK;
111#ifdef CONFIG_TASK_IO_ACCOUNTING
112    stats->read_bytes = p->ioac.read_bytes & KB_MASK;
113    stats->write_bytes = p->ioac.write_bytes & KB_MASK;
114    stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
115#else
116    stats->read_bytes = 0;
117    stats->write_bytes = 0;
118    stats->cancelled_write_bytes = 0;
119#endif
120}
121#undef KB
122#undef MB
123
124static void __acct_update_integrals(struct task_struct *tsk,
125                    cputime_t utime, cputime_t stime)
126{
127    if (likely(tsk->mm)) {
128        cputime_t time, dtime;
129        struct timeval value;
130        unsigned long flags;
131        u64 delta;
132
133        local_irq_save(flags);
134        time = stime + utime;
135        dtime = time - tsk->acct_timexpd;
136        jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
137        delta = value.tv_sec;
138        delta = delta * USEC_PER_SEC + value.tv_usec;
139
140        if (delta == 0)
141            goto out;
142        tsk->acct_timexpd = time;
143        tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
144        tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
145    out:
146        local_irq_restore(flags);
147    }
148}
149
150/**
151 * acct_update_integrals - update mm integral fields in task_struct
152 * @tsk: task_struct for accounting
153 */
154void acct_update_integrals(struct task_struct *tsk)
155{
156    cputime_t utime, stime;
157
158    task_cputime(tsk, &utime, &stime);
159    __acct_update_integrals(tsk, utime, stime);
160}
161
162/**
163 * acct_account_cputime - update mm integral after cputime update
164 * @tsk: task_struct for accounting
165 */
166void acct_account_cputime(struct task_struct *tsk)
167{
168    __acct_update_integrals(tsk, tsk->utime, tsk->stime);
169}
170
171/**
172 * acct_clear_integrals - clear the mm integral fields in task_struct
173 * @tsk: task_struct whose accounting fields are cleared
174 */
175void acct_clear_integrals(struct task_struct *tsk)
176{
177    tsk->acct_timexpd = 0;
178    tsk->acct_rss_mem1 = 0;
179    tsk->acct_vm_mem1 = 0;
180}
181#endif
182

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