2 * tsacct.c - System accounting over taskstats interface
4 * Copyright (C) Jay Lan, <jlan@sgi.com>
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.
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.
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>
26 #define USEC_PER_TICK (USEC_PER_SEC/HZ)
28 * fill in basic accounting fields
30 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
32 struct timespec uptime, ts;
35 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
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;
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;
62 stats->ac_ppid = pid_alive(tsk) ?
63 rcu_dereference(tsk->real_parent)->tgid : 0;
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;
70 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
74 #ifdef CONFIG_TASK_XACCT
79 * fill in extended accounting fields
81 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
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;
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;
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;
104 stats->read_bytes = 0;
105 stats->write_bytes = 0;
106 stats->cancelled_write_bytes = 0;
113 * acct_update_integrals - update mm integral fields in task_struct
114 * @tsk: task_struct for accounting
116 void acct_update_integrals(struct task_struct *tsk)
118 if (likely(tsk->mm)) {
119 long delta = cputime_to_jiffies(
120 cputime_sub(tsk->stime, tsk->acct_stimexpd));
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;
131 * acct_clear_integrals - clear the mm integral fields in task_struct
132 * @tsk: task_struct whose accounting fields are cleared
134 void acct_clear_integrals(struct task_struct *tsk)
136 tsk->acct_stimexpd = 0;
137 tsk->acct_rss_mem1 = 0;
138 tsk->acct_vm_mem1 = 0;