1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * tsacct.c - System accounting over taskstats 2 * tsacct.c - System accounting over taskstats interface
4 * 3 *
5 * Copyright (C) Jay Lan, <jlan@sgi.com> 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 *
6 */ 17 */
7 18
8 #include <linux/kernel.h> 19 #include <linux/kernel.h>
9 #include <linux/sched/signal.h> 20 #include <linux/sched/signal.h>
10 #include <linux/sched/mm.h> 21 #include <linux/sched/mm.h>
11 #include <linux/sched/cputime.h> 22 #include <linux/sched/cputime.h>
12 #include <linux/tsacct_kern.h> 23 #include <linux/tsacct_kern.h>
13 #include <linux/acct.h> 24 #include <linux/acct.h>
14 #include <linux/jiffies.h> 25 #include <linux/jiffies.h>
15 #include <linux/mm.h> 26 #include <linux/mm.h>
16 27
17 /* 28 /*
18 * fill in basic accounting fields 29 * fill in basic accounting fields
19 */ 30 */
20 void bacct_add_tsk(struct user_namespace *user 31 void bacct_add_tsk(struct user_namespace *user_ns,
21 struct pid_namespace *pid_n 32 struct pid_namespace *pid_ns,
22 struct taskstats *stats, st 33 struct taskstats *stats, struct task_struct *tsk)
23 { 34 {
24 const struct cred *tcred; 35 const struct cred *tcred;
25 u64 utime, stime, utimescaled, stimesc 36 u64 utime, stime, utimescaled, stimescaled;
26 u64 now_ns, delta; !! 37 u64 delta;
27 time64_t btime; <<
28 38
29 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_L 39 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
30 40
31 /* calculate task elapsed time in nsec 41 /* calculate task elapsed time in nsec */
32 now_ns = ktime_get_ns(); !! 42 delta = ktime_get_ns() - tsk->start_time;
33 /* store whole group time first */ <<
34 delta = now_ns - tsk->group_leader->st <<
35 /* Convert to micro seconds */ 43 /* Convert to micro seconds */
36 do_div(delta, NSEC_PER_USEC); 44 do_div(delta, NSEC_PER_USEC);
37 stats->ac_tgetime = delta; <<
38 delta = now_ns - tsk->start_time; <<
39 do_div(delta, NSEC_PER_USEC); <<
40 stats->ac_etime = delta; 45 stats->ac_etime = delta;
41 /* Convert to seconds for btime (note !! 46 /* Convert to seconds for btime */
42 btime = ktime_get_real_seconds() - div !! 47 do_div(delta, USEC_PER_SEC);
43 stats->ac_btime = clamp_t(time64_t, bt !! 48 stats->ac_btime = get_seconds() - delta;
44 stats->ac_btime64 = btime; <<
45 <<
46 if (tsk->flags & PF_EXITING) 49 if (tsk->flags & PF_EXITING)
47 stats->ac_exitcode = tsk->exit 50 stats->ac_exitcode = tsk->exit_code;
48 if (thread_group_leader(tsk) && (tsk-> 51 if (thread_group_leader(tsk) && (tsk->flags & PF_FORKNOEXEC))
49 stats->ac_flag |= AFORK; 52 stats->ac_flag |= AFORK;
50 if (tsk->flags & PF_SUPERPRIV) 53 if (tsk->flags & PF_SUPERPRIV)
51 stats->ac_flag |= ASU; 54 stats->ac_flag |= ASU;
52 if (tsk->flags & PF_DUMPCORE) 55 if (tsk->flags & PF_DUMPCORE)
53 stats->ac_flag |= ACORE; 56 stats->ac_flag |= ACORE;
54 if (tsk->flags & PF_SIGNALED) 57 if (tsk->flags & PF_SIGNALED)
55 stats->ac_flag |= AXSIG; 58 stats->ac_flag |= AXSIG;
56 stats->ac_nice = task_nice(tsk); 59 stats->ac_nice = task_nice(tsk);
57 stats->ac_sched = tsk->policy; 60 stats->ac_sched = tsk->policy;
58 stats->ac_pid = task_pid_nr_ns(tsk, 61 stats->ac_pid = task_pid_nr_ns(tsk, pid_ns);
59 stats->ac_tgid = task_tgid_nr_ns(tsk <<
60 rcu_read_lock(); 62 rcu_read_lock();
61 tcred = __task_cred(tsk); 63 tcred = __task_cred(tsk);
62 stats->ac_uid = from_kuid_munged(us 64 stats->ac_uid = from_kuid_munged(user_ns, tcred->uid);
63 stats->ac_gid = from_kgid_munged(us 65 stats->ac_gid = from_kgid_munged(user_ns, tcred->gid);
64 stats->ac_ppid = pid_alive(tsk) ? 66 stats->ac_ppid = pid_alive(tsk) ?
65 task_tgid_nr_ns(rcu_dereferenc 67 task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
66 rcu_read_unlock(); 68 rcu_read_unlock();
67 69
68 task_cputime(tsk, &utime, &stime); 70 task_cputime(tsk, &utime, &stime);
69 stats->ac_utime = div_u64(utime, NSEC_ 71 stats->ac_utime = div_u64(utime, NSEC_PER_USEC);
70 stats->ac_stime = div_u64(stime, NSEC_ 72 stats->ac_stime = div_u64(stime, NSEC_PER_USEC);
71 73
72 task_cputime_scaled(tsk, &utimescaled, 74 task_cputime_scaled(tsk, &utimescaled, &stimescaled);
73 stats->ac_utimescaled = div_u64(utimes 75 stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC);
74 stats->ac_stimescaled = div_u64(stimes 76 stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC);
75 77
76 stats->ac_minflt = tsk->min_flt; 78 stats->ac_minflt = tsk->min_flt;
77 stats->ac_majflt = tsk->maj_flt; 79 stats->ac_majflt = tsk->maj_flt;
78 80
79 strscpy_pad(stats->ac_comm, tsk->comm) !! 81 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
80 } 82 }
81 83
82 84
83 #ifdef CONFIG_TASK_XACCT 85 #ifdef CONFIG_TASK_XACCT
84 86
85 #define KB 1024 87 #define KB 1024
86 #define MB (1024*KB) 88 #define MB (1024*KB)
87 #define KB_MASK (~(KB-1)) 89 #define KB_MASK (~(KB-1))
88 /* 90 /*
89 * fill in extended accounting fields 91 * fill in extended accounting fields
90 */ 92 */
91 void xacct_add_tsk(struct taskstats *stats, st 93 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
92 { 94 {
93 struct mm_struct *mm; 95 struct mm_struct *mm;
94 96
95 /* convert pages-nsec/1024 to Mbyte-us 97 /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */
96 stats->coremem = p->acct_rss_mem1 * PA 98 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE;
97 do_div(stats->coremem, 1000 * KB); 99 do_div(stats->coremem, 1000 * KB);
98 stats->virtmem = p->acct_vm_mem1 * PAG 100 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE;
99 do_div(stats->virtmem, 1000 * KB); 101 do_div(stats->virtmem, 1000 * KB);
100 mm = get_task_mm(p); 102 mm = get_task_mm(p);
101 if (mm) { 103 if (mm) {
102 /* adjust to KB unit */ 104 /* adjust to KB unit */
103 stats->hiwater_rss = get_mm_ 105 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
104 stats->hiwater_vm = get_mm_ 106 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
105 mmput(mm); 107 mmput(mm);
106 } 108 }
107 stats->read_char = p->ioac.rcha 109 stats->read_char = p->ioac.rchar & KB_MASK;
108 stats->write_char = p->ioac.wcha 110 stats->write_char = p->ioac.wchar & KB_MASK;
109 stats->read_syscalls = p->ioac.sysc 111 stats->read_syscalls = p->ioac.syscr & KB_MASK;
110 stats->write_syscalls = p->ioac.sysc 112 stats->write_syscalls = p->ioac.syscw & KB_MASK;
111 #ifdef CONFIG_TASK_IO_ACCOUNTING 113 #ifdef CONFIG_TASK_IO_ACCOUNTING
112 stats->read_bytes = p->ioac.read 114 stats->read_bytes = p->ioac.read_bytes & KB_MASK;
113 stats->write_bytes = p->ioac.writ 115 stats->write_bytes = p->ioac.write_bytes & KB_MASK;
114 stats->cancelled_write_bytes = p->ioac 116 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
115 #else 117 #else
116 stats->read_bytes = 0; 118 stats->read_bytes = 0;
117 stats->write_bytes = 0; 119 stats->write_bytes = 0;
118 stats->cancelled_write_bytes = 0; 120 stats->cancelled_write_bytes = 0;
119 #endif 121 #endif
120 } 122 }
121 #undef KB 123 #undef KB
122 #undef MB 124 #undef MB
123 125
124 static void __acct_update_integrals(struct tas 126 static void __acct_update_integrals(struct task_struct *tsk,
125 u64 utime, 127 u64 utime, u64 stime)
126 { 128 {
127 u64 time, delta; 129 u64 time, delta;
128 130
129 if (!likely(tsk->mm)) 131 if (!likely(tsk->mm))
130 return; 132 return;
131 133
132 time = stime + utime; 134 time = stime + utime;
133 delta = time - tsk->acct_timexpd; 135 delta = time - tsk->acct_timexpd;
134 136
135 if (delta < TICK_NSEC) 137 if (delta < TICK_NSEC)
136 return; 138 return;
137 139
138 tsk->acct_timexpd = time; 140 tsk->acct_timexpd = time;
139 /* 141 /*
140 * Divide by 1024 to avoid overflow, a 142 * Divide by 1024 to avoid overflow, and to avoid division.
141 * The final unit reported to userspac 143 * The final unit reported to userspace is Mbyte-usecs,
142 * the rest of the math is done in xac 144 * the rest of the math is done in xacct_add_tsk.
143 */ 145 */
144 tsk->acct_rss_mem1 += delta * get_mm_r 146 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10;
145 tsk->acct_vm_mem1 += delta * READ_ONCE !! 147 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10;
146 } 148 }
147 149
148 /** 150 /**
149 * acct_update_integrals - update mm integral 151 * acct_update_integrals - update mm integral fields in task_struct
150 * @tsk: task_struct for accounting 152 * @tsk: task_struct for accounting
151 */ 153 */
152 void acct_update_integrals(struct task_struct 154 void acct_update_integrals(struct task_struct *tsk)
153 { 155 {
154 u64 utime, stime; 156 u64 utime, stime;
155 unsigned long flags; 157 unsigned long flags;
156 158
157 local_irq_save(flags); 159 local_irq_save(flags);
158 task_cputime(tsk, &utime, &stime); 160 task_cputime(tsk, &utime, &stime);
159 __acct_update_integrals(tsk, utime, st 161 __acct_update_integrals(tsk, utime, stime);
160 local_irq_restore(flags); 162 local_irq_restore(flags);
161 } 163 }
162 164
163 /** 165 /**
164 * acct_account_cputime - update mm integral a 166 * acct_account_cputime - update mm integral after cputime update
165 * @tsk: task_struct for accounting 167 * @tsk: task_struct for accounting
166 */ 168 */
167 void acct_account_cputime(struct task_struct * 169 void acct_account_cputime(struct task_struct *tsk)
168 { 170 {
169 __acct_update_integrals(tsk, tsk->utim 171 __acct_update_integrals(tsk, tsk->utime, tsk->stime);
170 } 172 }
171 173
172 /** 174 /**
173 * acct_clear_integrals - clear the mm integra 175 * acct_clear_integrals - clear the mm integral fields in task_struct
174 * @tsk: task_struct whose accounting fields a 176 * @tsk: task_struct whose accounting fields are cleared
175 */ 177 */
176 void acct_clear_integrals(struct task_struct * 178 void acct_clear_integrals(struct task_struct *tsk)
177 { 179 {
178 tsk->acct_timexpd = 0; 180 tsk->acct_timexpd = 0;
179 tsk->acct_rss_mem1 = 0; 181 tsk->acct_rss_mem1 = 0;
180 tsk->acct_vm_mem1 = 0; 182 tsk->acct_vm_mem1 = 0;
181 } 183 }
182 #endif 184 #endif
183 185
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