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/signal.h>
21 #include <linux/sched/mm.h>
22 #include <linux/tsacct_kern.h>
23 #include <linux/acct.h>
24 #include <linux/jiffies.h>
28 * fill in basic accounting fields
30 void bacct_add_tsk(struct user_namespace *user_ns,
31 struct pid_namespace *pid_ns,
32 struct taskstats *stats, struct task_struct *tsk)
34 const struct cred *tcred;
35 u64 utime, stime, utimescaled, stimescaled;
38 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
40 /* calculate task elapsed time in nsec */
41 delta = ktime_get_ns() - tsk->start_time;
42 /* Convert to micro seconds */
43 do_div(delta, NSEC_PER_USEC);
44 stats->ac_etime = delta;
45 /* Convert to seconds for btime */
46 do_div(delta, USEC_PER_SEC);
47 stats->ac_btime = get_seconds() - delta;
48 if (thread_group_leader(tsk)) {
49 stats->ac_exitcode = tsk->exit_code;
50 if (tsk->flags & PF_FORKNOEXEC)
51 stats->ac_flag |= AFORK;
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);
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;
70 task_cputime(tsk, &utime, &stime);
71 stats->ac_utime = div_u64(utime, NSEC_PER_USEC);
72 stats->ac_stime = div_u64(stime, NSEC_PER_USEC);
74 task_cputime_scaled(tsk, &utimescaled, &stimescaled);
75 stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC);
76 stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC);
78 stats->ac_minflt = tsk->min_flt;
79 stats->ac_majflt = tsk->maj_flt;
81 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
85 #ifdef CONFIG_TASK_XACCT
89 #define KB_MASK (~(KB-1))
91 * fill in extended accounting fields
93 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
97 /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */
98 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE;
99 do_div(stats->coremem, 1000 * KB);
100 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE;
101 do_div(stats->virtmem, 1000 * KB);
104 /* adjust to KB unit */
105 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
106 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
109 stats->read_char = p->ioac.rchar & KB_MASK;
110 stats->write_char = p->ioac.wchar & KB_MASK;
111 stats->read_syscalls = p->ioac.syscr & KB_MASK;
112 stats->write_syscalls = p->ioac.syscw & KB_MASK;
113 #ifdef CONFIG_TASK_IO_ACCOUNTING
114 stats->read_bytes = p->ioac.read_bytes & KB_MASK;
115 stats->write_bytes = p->ioac.write_bytes & KB_MASK;
116 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
118 stats->read_bytes = 0;
119 stats->write_bytes = 0;
120 stats->cancelled_write_bytes = 0;
126 static void __acct_update_integrals(struct task_struct *tsk,
127 u64 utime, u64 stime)
131 if (!likely(tsk->mm))
134 time = stime + utime;
135 delta = time - tsk->acct_timexpd;
137 if (delta < TICK_NSEC)
140 tsk->acct_timexpd = time;
142 * Divide by 1024 to avoid overflow, and to avoid division.
143 * The final unit reported to userspace is Mbyte-usecs,
144 * the rest of the math is done in xacct_add_tsk.
146 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10;
147 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10;
151 * acct_update_integrals - update mm integral fields in task_struct
152 * @tsk: task_struct for accounting
154 void acct_update_integrals(struct task_struct *tsk)
159 local_irq_save(flags);
160 task_cputime(tsk, &utime, &stime);
161 __acct_update_integrals(tsk, utime, stime);
162 local_irq_restore(flags);
166 * acct_account_cputime - update mm integral after cputime update
167 * @tsk: task_struct for accounting
169 void acct_account_cputime(struct task_struct *tsk)
171 __acct_update_integrals(tsk, tsk->utime, tsk->stime);
175 * acct_clear_integrals - clear the mm integral fields in task_struct
176 * @tsk: task_struct whose accounting fields are cleared
178 void acct_clear_integrals(struct task_struct *tsk)
180 tsk->acct_timexpd = 0;
181 tsk->acct_rss_mem1 = 0;
182 tsk->acct_vm_mem1 = 0;