xref: /openbmc/linux/kernel/tsacct.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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  * fill in basic accounting fields
27  */
28 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
29 {
30 	struct timespec uptime, ts;
31 	s64 ac_etime;
32 
33 	BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
34 
35 	/* calculate task elapsed time in timespec */
36 	do_posix_clock_monotonic_gettime(&uptime);
37 	ts = timespec_sub(uptime, tsk->start_time);
38 	/* rebase elapsed time to usec */
39 	ac_etime = timespec_to_ns(&ts);
40 	do_div(ac_etime, NSEC_PER_USEC);
41 	stats->ac_etime = ac_etime;
42 	stats->ac_btime = xtime.tv_sec - ts.tv_sec;
43 	if (thread_group_leader(tsk)) {
44 		stats->ac_exitcode = tsk->exit_code;
45 		if (tsk->flags & PF_FORKNOEXEC)
46 			stats->ac_flag |= AFORK;
47 	}
48 	if (tsk->flags & PF_SUPERPRIV)
49 		stats->ac_flag |= ASU;
50 	if (tsk->flags & PF_DUMPCORE)
51 		stats->ac_flag |= ACORE;
52 	if (tsk->flags & PF_SIGNALED)
53 		stats->ac_flag |= AXSIG;
54 	stats->ac_nice	 = task_nice(tsk);
55 	stats->ac_sched	 = tsk->policy;
56 	stats->ac_uid	 = tsk->uid;
57 	stats->ac_gid	 = tsk->gid;
58 	stats->ac_pid	 = tsk->pid;
59 	rcu_read_lock();
60 	stats->ac_ppid	 = pid_alive(tsk) ?
61 				rcu_dereference(tsk->real_parent)->tgid : 0;
62 	rcu_read_unlock();
63 	stats->ac_utime	 = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;
64 	stats->ac_stime	 = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;
65 	stats->ac_minflt = tsk->min_flt;
66 	stats->ac_majflt = tsk->maj_flt;
67 
68 	strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
69 }
70 
71 
72 #ifdef CONFIG_TASK_XACCT
73 
74 #define KB 1024
75 #define MB (1024*KB)
76 /*
77  * fill in extended accounting fields
78  */
79 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
80 {
81 	struct mm_struct *mm;
82 
83 	/* convert pages-jiffies to Mbyte-usec */
84 	stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;
85 	stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;
86 	mm = get_task_mm(p);
87 	if (mm) {
88 		/* adjust to KB unit */
89 		stats->hiwater_rss   = mm->hiwater_rss * PAGE_SIZE / KB;
90 		stats->hiwater_vm    = mm->hiwater_vm * PAGE_SIZE / KB;
91 		mmput(mm);
92 	}
93 	stats->read_char	= p->rchar;
94 	stats->write_char	= p->wchar;
95 	stats->read_syscalls	= p->syscr;
96 	stats->write_syscalls	= p->syscw;
97 #ifdef CONFIG_TASK_IO_ACCOUNTING
98 	stats->read_bytes	= p->ioac.read_bytes;
99 	stats->write_bytes	= p->ioac.write_bytes;
100 	stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
101 #else
102 	stats->read_bytes	= 0;
103 	stats->write_bytes	= 0;
104 	stats->cancelled_write_bytes = 0;
105 #endif
106 }
107 #undef KB
108 #undef MB
109 
110 /**
111  * acct_update_integrals - update mm integral fields in task_struct
112  * @tsk: task_struct for accounting
113  */
114 void acct_update_integrals(struct task_struct *tsk)
115 {
116 	if (likely(tsk->mm)) {
117 		long delta = cputime_to_jiffies(
118 			cputime_sub(tsk->stime, tsk->acct_stimexpd));
119 
120 		if (delta == 0)
121 			return;
122 		tsk->acct_stimexpd = tsk->stime;
123 		tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
124 		tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
125 	}
126 }
127 
128 /**
129  * acct_clear_integrals - clear the mm integral fields in task_struct
130  * @tsk: task_struct whose accounting fields are cleared
131  */
132 void acct_clear_integrals(struct task_struct *tsk)
133 {
134 	tsk->acct_stimexpd = 0;
135 	tsk->acct_rss_mem1 = 0;
136 	tsk->acct_vm_mem1 = 0;
137 }
138 #endif
139