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