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; 27 time64_t btime;
28 28
29 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_L 29 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
30 30
31 /* calculate task elapsed time in nsec 31 /* calculate task elapsed time in nsec */
32 now_ns = ktime_get_ns(); !! 32 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 */ 33 /* Convert to micro seconds */
36 do_div(delta, NSEC_PER_USEC); 34 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; 35 stats->ac_etime = delta;
41 /* Convert to seconds for btime (note 36 /* Convert to seconds for btime (note y2106 limit) */
42 btime = ktime_get_real_seconds() - div 37 btime = ktime_get_real_seconds() - div_u64(delta, USEC_PER_SEC);
43 stats->ac_btime = clamp_t(time64_t, bt 38 stats->ac_btime = clamp_t(time64_t, btime, 0, U32_MAX);
44 stats->ac_btime64 = btime; 39 stats->ac_btime64 = btime;
45 40
46 if (tsk->flags & PF_EXITING) !! 41 if (thread_group_leader(tsk)) {
47 stats->ac_exitcode = tsk->exit 42 stats->ac_exitcode = tsk->exit_code;
48 if (thread_group_leader(tsk) && (tsk-> !! 43 if (tsk->flags & PF_FORKNOEXEC)
49 stats->ac_flag |= AFORK; !! 44 stats->ac_flag |= AFORK;
>> 45 }
50 if (tsk->flags & PF_SUPERPRIV) 46 if (tsk->flags & PF_SUPERPRIV)
51 stats->ac_flag |= ASU; 47 stats->ac_flag |= ASU;
52 if (tsk->flags & PF_DUMPCORE) 48 if (tsk->flags & PF_DUMPCORE)
53 stats->ac_flag |= ACORE; 49 stats->ac_flag |= ACORE;
54 if (tsk->flags & PF_SIGNALED) 50 if (tsk->flags & PF_SIGNALED)
55 stats->ac_flag |= AXSIG; 51 stats->ac_flag |= AXSIG;
56 stats->ac_nice = task_nice(tsk); 52 stats->ac_nice = task_nice(tsk);
57 stats->ac_sched = tsk->policy; 53 stats->ac_sched = tsk->policy;
58 stats->ac_pid = task_pid_nr_ns(tsk, 54 stats->ac_pid = task_pid_nr_ns(tsk, pid_ns);
59 stats->ac_tgid = task_tgid_nr_ns(tsk <<
60 rcu_read_lock(); 55 rcu_read_lock();
61 tcred = __task_cred(tsk); 56 tcred = __task_cred(tsk);
62 stats->ac_uid = from_kuid_munged(us 57 stats->ac_uid = from_kuid_munged(user_ns, tcred->uid);
63 stats->ac_gid = from_kgid_munged(us 58 stats->ac_gid = from_kgid_munged(user_ns, tcred->gid);
64 stats->ac_ppid = pid_alive(tsk) ? 59 stats->ac_ppid = pid_alive(tsk) ?
65 task_tgid_nr_ns(rcu_dereferenc 60 task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
66 rcu_read_unlock(); 61 rcu_read_unlock();
67 62
68 task_cputime(tsk, &utime, &stime); 63 task_cputime(tsk, &utime, &stime);
69 stats->ac_utime = div_u64(utime, NSEC_ 64 stats->ac_utime = div_u64(utime, NSEC_PER_USEC);
70 stats->ac_stime = div_u64(stime, NSEC_ 65 stats->ac_stime = div_u64(stime, NSEC_PER_USEC);
71 66
72 task_cputime_scaled(tsk, &utimescaled, 67 task_cputime_scaled(tsk, &utimescaled, &stimescaled);
73 stats->ac_utimescaled = div_u64(utimes 68 stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC);
74 stats->ac_stimescaled = div_u64(stimes 69 stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC);
75 70
76 stats->ac_minflt = tsk->min_flt; 71 stats->ac_minflt = tsk->min_flt;
77 stats->ac_majflt = tsk->maj_flt; 72 stats->ac_majflt = tsk->maj_flt;
78 73
79 strscpy_pad(stats->ac_comm, tsk->comm) !! 74 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
80 } 75 }
81 76
82 77
83 #ifdef CONFIG_TASK_XACCT 78 #ifdef CONFIG_TASK_XACCT
84 79
85 #define KB 1024 80 #define KB 1024
86 #define MB (1024*KB) 81 #define MB (1024*KB)
87 #define KB_MASK (~(KB-1)) 82 #define KB_MASK (~(KB-1))
88 /* 83 /*
89 * fill in extended accounting fields 84 * fill in extended accounting fields
90 */ 85 */
91 void xacct_add_tsk(struct taskstats *stats, st 86 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
92 { 87 {
93 struct mm_struct *mm; 88 struct mm_struct *mm;
94 89
95 /* convert pages-nsec/1024 to Mbyte-us 90 /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */
96 stats->coremem = p->acct_rss_mem1 * PA 91 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE;
97 do_div(stats->coremem, 1000 * KB); 92 do_div(stats->coremem, 1000 * KB);
98 stats->virtmem = p->acct_vm_mem1 * PAG 93 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE;
99 do_div(stats->virtmem, 1000 * KB); 94 do_div(stats->virtmem, 1000 * KB);
100 mm = get_task_mm(p); 95 mm = get_task_mm(p);
101 if (mm) { 96 if (mm) {
102 /* adjust to KB unit */ 97 /* adjust to KB unit */
103 stats->hiwater_rss = get_mm_ 98 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
104 stats->hiwater_vm = get_mm_ 99 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
105 mmput(mm); 100 mmput(mm);
106 } 101 }
107 stats->read_char = p->ioac.rcha 102 stats->read_char = p->ioac.rchar & KB_MASK;
108 stats->write_char = p->ioac.wcha 103 stats->write_char = p->ioac.wchar & KB_MASK;
109 stats->read_syscalls = p->ioac.sysc 104 stats->read_syscalls = p->ioac.syscr & KB_MASK;
110 stats->write_syscalls = p->ioac.sysc 105 stats->write_syscalls = p->ioac.syscw & KB_MASK;
111 #ifdef CONFIG_TASK_IO_ACCOUNTING 106 #ifdef CONFIG_TASK_IO_ACCOUNTING
112 stats->read_bytes = p->ioac.read 107 stats->read_bytes = p->ioac.read_bytes & KB_MASK;
113 stats->write_bytes = p->ioac.writ 108 stats->write_bytes = p->ioac.write_bytes & KB_MASK;
114 stats->cancelled_write_bytes = p->ioac 109 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
115 #else 110 #else
116 stats->read_bytes = 0; 111 stats->read_bytes = 0;
117 stats->write_bytes = 0; 112 stats->write_bytes = 0;
118 stats->cancelled_write_bytes = 0; 113 stats->cancelled_write_bytes = 0;
119 #endif 114 #endif
120 } 115 }
121 #undef KB 116 #undef KB
122 #undef MB 117 #undef MB
123 118
124 static void __acct_update_integrals(struct tas 119 static void __acct_update_integrals(struct task_struct *tsk,
125 u64 utime, 120 u64 utime, u64 stime)
126 { 121 {
127 u64 time, delta; 122 u64 time, delta;
128 123
129 if (!likely(tsk->mm)) 124 if (!likely(tsk->mm))
130 return; 125 return;
131 126
132 time = stime + utime; 127 time = stime + utime;
133 delta = time - tsk->acct_timexpd; 128 delta = time - tsk->acct_timexpd;
134 129
135 if (delta < TICK_NSEC) 130 if (delta < TICK_NSEC)
136 return; 131 return;
137 132
138 tsk->acct_timexpd = time; 133 tsk->acct_timexpd = time;
139 /* 134 /*
140 * Divide by 1024 to avoid overflow, a 135 * Divide by 1024 to avoid overflow, and to avoid division.
141 * The final unit reported to userspac 136 * The final unit reported to userspace is Mbyte-usecs,
142 * the rest of the math is done in xac 137 * the rest of the math is done in xacct_add_tsk.
143 */ 138 */
144 tsk->acct_rss_mem1 += delta * get_mm_r 139 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10;
145 tsk->acct_vm_mem1 += delta * READ_ONCE !! 140 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10;
146 } 141 }
147 142
148 /** 143 /**
149 * acct_update_integrals - update mm integral 144 * acct_update_integrals - update mm integral fields in task_struct
150 * @tsk: task_struct for accounting 145 * @tsk: task_struct for accounting
151 */ 146 */
152 void acct_update_integrals(struct task_struct 147 void acct_update_integrals(struct task_struct *tsk)
153 { 148 {
154 u64 utime, stime; 149 u64 utime, stime;
155 unsigned long flags; 150 unsigned long flags;
156 151
157 local_irq_save(flags); 152 local_irq_save(flags);
158 task_cputime(tsk, &utime, &stime); 153 task_cputime(tsk, &utime, &stime);
159 __acct_update_integrals(tsk, utime, st 154 __acct_update_integrals(tsk, utime, stime);
160 local_irq_restore(flags); 155 local_irq_restore(flags);
161 } 156 }
162 157
163 /** 158 /**
164 * acct_account_cputime - update mm integral a 159 * acct_account_cputime - update mm integral after cputime update
165 * @tsk: task_struct for accounting 160 * @tsk: task_struct for accounting
166 */ 161 */
167 void acct_account_cputime(struct task_struct * 162 void acct_account_cputime(struct task_struct *tsk)
168 { 163 {
169 __acct_update_integrals(tsk, tsk->utim 164 __acct_update_integrals(tsk, tsk->utime, tsk->stime);
170 } 165 }
171 166
172 /** 167 /**
173 * acct_clear_integrals - clear the mm integra 168 * acct_clear_integrals - clear the mm integral fields in task_struct
174 * @tsk: task_struct whose accounting fields a 169 * @tsk: task_struct whose accounting fields are cleared
175 */ 170 */
176 void acct_clear_integrals(struct task_struct * 171 void acct_clear_integrals(struct task_struct *tsk)
177 { 172 {
178 tsk->acct_timexpd = 0; 173 tsk->acct_timexpd = 0;
179 tsk->acct_rss_mem1 = 0; 174 tsk->acct_rss_mem1 = 0;
180 tsk->acct_vm_mem1 = 0; 175 tsk->acct_vm_mem1 = 0;
181 } 176 }
182 #endif 177 #endif
183 178
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