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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - kernel/tsacct.c
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/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;