Pull button into test branch
[pandora-kernel.git] / 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
25
26 #define USEC_PER_TICK   (USEC_PER_SEC/HZ)
27 /*
28  * fill in basic accounting fields
29  */
30 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
31 {
32         struct timespec uptime, ts;
33         s64 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 */
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 = xtime.tv_sec - 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_uid    = tsk->uid;
59         stats->ac_gid    = tsk->gid;
60         stats->ac_pid    = tsk->pid;
61         rcu_read_lock();
62         stats->ac_ppid   = pid_alive(tsk) ?
63                                 rcu_dereference(tsk->real_parent)->tgid : 0;
64         rcu_read_unlock();
65         stats->ac_utime  = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;
66         stats->ac_stime  = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;
67         stats->ac_minflt = tsk->min_flt;
68         stats->ac_majflt = tsk->maj_flt;
69
70         strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
71 }
72
73
74 #ifdef CONFIG_TASK_XACCT
75
76 #define KB 1024
77 #define MB (1024*KB)
78 /*
79  * fill in extended accounting fields
80  */
81 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
82 {
83         struct mm_struct *mm;
84
85         /* convert pages-jiffies to Mbyte-usec */
86         stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;
87         stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;
88         mm = get_task_mm(p);
89         if (mm) {
90                 /* adjust to KB unit */
91                 stats->hiwater_rss   = mm->hiwater_rss * PAGE_SIZE / KB;
92                 stats->hiwater_vm    = mm->hiwater_vm * PAGE_SIZE / KB;
93                 mmput(mm);
94         }
95         stats->read_char        = p->rchar;
96         stats->write_char       = p->wchar;
97         stats->read_syscalls    = p->syscr;
98         stats->write_syscalls   = p->syscw;
99 #ifdef CONFIG_TASK_IO_ACCOUNTING
100         stats->read_bytes       = p->ioac.read_bytes;
101         stats->write_bytes      = p->ioac.write_bytes;
102         stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
103 #else
104         stats->read_bytes       = 0;
105         stats->write_bytes      = 0;
106         stats->cancelled_write_bytes = 0;
107 #endif
108 }
109 #undef KB
110 #undef MB
111
112 /**
113  * acct_update_integrals - update mm integral fields in task_struct
114  * @tsk: task_struct for accounting
115  */
116 void acct_update_integrals(struct task_struct *tsk)
117 {
118         if (likely(tsk->mm)) {
119                 long delta = cputime_to_jiffies(
120                         cputime_sub(tsk->stime, tsk->acct_stimexpd));
121
122                 if (delta == 0)
123                         return;
124                 tsk->acct_stimexpd = tsk->stime;
125                 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
126                 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
127         }
128 }
129
130 /**
131  * acct_clear_integrals - clear the mm integral fields in task_struct
132  * @tsk: task_struct whose accounting fields are cleared
133  */
134 void acct_clear_integrals(struct task_struct *tsk)
135 {
136         tsk->acct_stimexpd = 0;
137         tsk->acct_rss_mem1 = 0;
138         tsk->acct_vm_mem1 = 0;
139 }
140 #endif