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.h>
10 #include <linux/sched/mm.h> <<
11 #include <linux/sched/cputime.h> <<
12 #include <linux/tsacct_kern.h> 21 #include <linux/tsacct_kern.h>
13 #include <linux/acct.h> 22 #include <linux/acct.h>
14 #include <linux/jiffies.h> 23 #include <linux/jiffies.h>
15 #include <linux/mm.h> 24 #include <linux/mm.h>
16 25
17 /* 26 /*
18 * fill in basic accounting fields 27 * fill in basic accounting fields
19 */ 28 */
20 void bacct_add_tsk(struct user_namespace *user 29 void bacct_add_tsk(struct user_namespace *user_ns,
21 struct pid_namespace *pid_n 30 struct pid_namespace *pid_ns,
22 struct taskstats *stats, st 31 struct taskstats *stats, struct task_struct *tsk)
23 { 32 {
24 const struct cred *tcred; 33 const struct cred *tcred;
25 u64 utime, stime, utimescaled, stimesc !! 34 struct timespec uptime, ts;
26 u64 now_ns, delta; !! 35 cputime_t utime, stime, utimescaled, stimescaled;
27 time64_t btime; !! 36 u64 ac_etime;
28 37
29 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_L 38 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
30 39
31 /* calculate task elapsed time in nsec !! 40 /* calculate task elapsed time in timespec */
32 now_ns = ktime_get_ns(); !! 41 do_posix_clock_monotonic_gettime(&uptime);
33 /* store whole group time first */ !! 42 ts = timespec_sub(uptime, tsk->start_time);
34 delta = now_ns - tsk->group_leader->st !! 43 /* rebase elapsed time to usec (should never be negative) */
35 /* Convert to micro seconds */ !! 44 ac_etime = timespec_to_ns(&ts);
36 do_div(delta, NSEC_PER_USEC); !! 45 do_div(ac_etime, NSEC_PER_USEC);
37 stats->ac_tgetime = delta; !! 46 stats->ac_etime = ac_etime;
38 delta = now_ns - tsk->start_time; !! 47 stats->ac_btime = get_seconds() - ts.tv_sec;
39 do_div(delta, NSEC_PER_USEC); !! 48 if (thread_group_leader(tsk)) {
40 stats->ac_etime = delta; <<
41 /* Convert to seconds for btime (note <<
42 btime = ktime_get_real_seconds() - div <<
43 stats->ac_btime = clamp_t(time64_t, bt <<
44 stats->ac_btime64 = btime; <<
45 <<
46 if (tsk->flags & PF_EXITING) <<
47 stats->ac_exitcode = tsk->exit 49 stats->ac_exitcode = tsk->exit_code;
48 if (thread_group_leader(tsk) && (tsk-> !! 50 if (tsk->flags & PF_FORKNOEXEC)
49 stats->ac_flag |= AFORK; !! 51 stats->ac_flag |= AFORK;
>> 52 }
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 = cputime_to_usecs(utime);
70 stats->ac_stime = div_u64(stime, NSEC_ !! 72 stats->ac_stime = cputime_to_usecs(stime);
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 = cputime_to_usecs(utimescaled);
74 stats->ac_stimescaled = div_u64(stimes !! 76 stats->ac_stimescaled = cputime_to_usecs(stimescaled);
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-usec to Mbyte-usec */
96 stats->coremem = p->acct_rss_mem1 * PA !! 98 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
97 do_div(stats->coremem, 1000 * KB); !! 99 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
98 stats->virtmem = p->acct_vm_mem1 * PAG <<
99 do_div(stats->virtmem, 1000 * KB); <<
100 mm = get_task_mm(p); 100 mm = get_task_mm(p);
101 if (mm) { 101 if (mm) {
102 /* adjust to KB unit */ 102 /* adjust to KB unit */
103 stats->hiwater_rss = get_mm_ 103 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
104 stats->hiwater_vm = get_mm_ 104 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
105 mmput(mm); 105 mmput(mm);
106 } 106 }
107 stats->read_char = p->ioac.rcha 107 stats->read_char = p->ioac.rchar & KB_MASK;
108 stats->write_char = p->ioac.wcha 108 stats->write_char = p->ioac.wchar & KB_MASK;
109 stats->read_syscalls = p->ioac.sysc 109 stats->read_syscalls = p->ioac.syscr & KB_MASK;
110 stats->write_syscalls = p->ioac.sysc 110 stats->write_syscalls = p->ioac.syscw & KB_MASK;
111 #ifdef CONFIG_TASK_IO_ACCOUNTING 111 #ifdef CONFIG_TASK_IO_ACCOUNTING
112 stats->read_bytes = p->ioac.read 112 stats->read_bytes = p->ioac.read_bytes & KB_MASK;
113 stats->write_bytes = p->ioac.writ 113 stats->write_bytes = p->ioac.write_bytes & KB_MASK;
114 stats->cancelled_write_bytes = p->ioac 114 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
115 #else 115 #else
116 stats->read_bytes = 0; 116 stats->read_bytes = 0;
117 stats->write_bytes = 0; 117 stats->write_bytes = 0;
118 stats->cancelled_write_bytes = 0; 118 stats->cancelled_write_bytes = 0;
119 #endif 119 #endif
120 } 120 }
121 #undef KB 121 #undef KB
122 #undef MB 122 #undef MB
123 123
124 static void __acct_update_integrals(struct tas 124 static void __acct_update_integrals(struct task_struct *tsk,
125 u64 utime, !! 125 cputime_t utime, cputime_t stime)
126 { 126 {
127 u64 time, delta; !! 127 if (likely(tsk->mm)) {
128 !! 128 cputime_t time, dtime;
129 if (!likely(tsk->mm)) !! 129 struct timeval value;
130 return; !! 130 unsigned long flags;
131 !! 131 u64 delta;
132 time = stime + utime; !! 132
133 delta = time - tsk->acct_timexpd; !! 133 local_irq_save(flags);
134 !! 134 time = stime + utime;
135 if (delta < TICK_NSEC) !! 135 dtime = time - tsk->acct_timexpd;
136 return; !! 136 jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
137 !! 137 delta = value.tv_sec;
138 tsk->acct_timexpd = time; !! 138 delta = delta * USEC_PER_SEC + value.tv_usec;
139 /* !! 139
140 * Divide by 1024 to avoid overflow, a !! 140 if (delta == 0)
141 * The final unit reported to userspac !! 141 goto out;
142 * the rest of the math is done in xac !! 142 tsk->acct_timexpd = time;
143 */ !! 143 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
144 tsk->acct_rss_mem1 += delta * get_mm_r !! 144 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
145 tsk->acct_vm_mem1 += delta * READ_ONCE !! 145 out:
>> 146 local_irq_restore(flags);
>> 147 }
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 cputime_t utime, stime;
155 unsigned long flags; <<
156 157
157 local_irq_save(flags); <<
158 task_cputime(tsk, &utime, &stime); 158 task_cputime(tsk, &utime, &stime);
159 __acct_update_integrals(tsk, utime, st 159 __acct_update_integrals(tsk, utime, stime);
160 local_irq_restore(flags); <<
161 } 160 }
162 161
163 /** 162 /**
164 * acct_account_cputime - update mm integral a 163 * acct_account_cputime - update mm integral after cputime update
165 * @tsk: task_struct for accounting 164 * @tsk: task_struct for accounting
166 */ 165 */
167 void acct_account_cputime(struct task_struct * 166 void acct_account_cputime(struct task_struct *tsk)
168 { 167 {
169 __acct_update_integrals(tsk, tsk->utim 168 __acct_update_integrals(tsk, tsk->utime, tsk->stime);
170 } 169 }
171 170
172 /** 171 /**
173 * acct_clear_integrals - clear the mm integra 172 * acct_clear_integrals - clear the mm integral fields in task_struct
174 * @tsk: task_struct whose accounting fields a 173 * @tsk: task_struct whose accounting fields are cleared
175 */ 174 */
176 void acct_clear_integrals(struct task_struct * 175 void acct_clear_integrals(struct task_struct *tsk)
177 { 176 {
178 tsk->acct_timexpd = 0; 177 tsk->acct_timexpd = 0;
179 tsk->acct_rss_mem1 = 0; 178 tsk->acct_rss_mem1 = 0;
180 tsk->acct_vm_mem1 = 0; 179 tsk->acct_vm_mem1 = 0;
181 } 180 }
182 #endif 181 #endif
183 182
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