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 taskstats *stats, struct task_struct *tsk)
30{
31    const struct cred *tcred;
32    struct timespec uptime, ts;
33    u64 ac_etime;
34
35    BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
36
37    /* calculate task elapsed time in timespec */
38    do_posix_clock_monotonic_gettime(&uptime);
39    ts = timespec_sub(uptime, tsk->start_time);
40    /* rebase elapsed time to usec (should never be negative) */
41    ac_etime = timespec_to_ns(&ts);
42    do_div(ac_etime, NSEC_PER_USEC);
43    stats->ac_etime = ac_etime;
44    stats->ac_btime = get_seconds() - ts.tv_sec;
45    if (thread_group_leader(tsk)) {
46        stats->ac_exitcode = tsk->exit_code;
47        if (tsk->flags & PF_FORKNOEXEC)
48            stats->ac_flag |= AFORK;
49    }
50    if (tsk->flags & PF_SUPERPRIV)
51        stats->ac_flag |= ASU;
52    if (tsk->flags & PF_DUMPCORE)
53        stats->ac_flag |= ACORE;
54    if (tsk->flags & PF_SIGNALED)
55        stats->ac_flag |= AXSIG;
56    stats->ac_nice = task_nice(tsk);
57    stats->ac_sched = tsk->policy;
58    stats->ac_pid = tsk->pid;
59    rcu_read_lock();
60    tcred = __task_cred(tsk);
61    stats->ac_uid = tcred->uid;
62    stats->ac_gid = tcred->gid;
63    stats->ac_ppid = pid_alive(tsk) ?
64                rcu_dereference(tsk->real_parent)->tgid : 0;
65    rcu_read_unlock();
66    stats->ac_utime = cputime_to_usecs(tsk->utime);
67    stats->ac_stime = cputime_to_usecs(tsk->stime);
68    stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled);
69    stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled);
70    stats->ac_minflt = tsk->min_flt;
71    stats->ac_majflt = tsk->maj_flt;
72
73    strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
74}
75
76
77#ifdef CONFIG_TASK_XACCT
78
79#define KB 1024
80#define MB (1024*KB)
81#define KB_MASK (~(KB-1))
82/*
83 * fill in extended accounting fields
84 */
85void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
86{
87    struct mm_struct *mm;
88
89    /* convert pages-usec to Mbyte-usec */
90    stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
91    stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
92    mm = get_task_mm(p);
93    if (mm) {
94        /* adjust to KB unit */
95        stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
96        stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
97        mmput(mm);
98    }
99    stats->read_char = p->ioac.rchar & KB_MASK;
100    stats->write_char = p->ioac.wchar & KB_MASK;
101    stats->read_syscalls = p->ioac.syscr & KB_MASK;
102    stats->write_syscalls = p->ioac.syscw & KB_MASK;
103#ifdef CONFIG_TASK_IO_ACCOUNTING
104    stats->read_bytes = p->ioac.read_bytes & KB_MASK;
105    stats->write_bytes = p->ioac.write_bytes & KB_MASK;
106    stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
107#else
108    stats->read_bytes = 0;
109    stats->write_bytes = 0;
110    stats->cancelled_write_bytes = 0;
111#endif
112}
113#undef KB
114#undef MB
115
116/**
117 * acct_update_integrals - update mm integral fields in task_struct
118 * @tsk: task_struct for accounting
119 */
120void acct_update_integrals(struct task_struct *tsk)
121{
122    if (likely(tsk->mm)) {
123        cputime_t time, dtime;
124        struct timeval value;
125        unsigned long flags;
126        u64 delta;
127
128        local_irq_save(flags);
129        time = tsk->stime + tsk->utime;
130        dtime = time - tsk->acct_timexpd;
131        jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
132        delta = value.tv_sec;
133        delta = delta * USEC_PER_SEC + value.tv_usec;
134
135        if (delta == 0)
136            goto out;
137        tsk->acct_timexpd = time;
138        tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
139        tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
140    out:
141        local_irq_restore(flags);
142    }
143}
144
145/**
146 * acct_clear_integrals - clear the mm integral fields in task_struct
147 * @tsk: task_struct whose accounting fields are cleared
148 */
149void acct_clear_integrals(struct task_struct *tsk)
150{
151    tsk->acct_timexpd = 0;
152    tsk->acct_rss_mem1 = 0;
153    tsk->acct_vm_mem1 = 0;
154}
155#endif
156

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