Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | /* |
| 2 | * tsacct.c - System accounting over taskstats interface |
| 3 | * |
| 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 | * |
| 17 | */ |
| 18 | |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/tsacct_kern.h> |
| 22 | #include <linux/acct.h> |
| 23 | #include <linux/jiffies.h> |
| 24 | #include <linux/mm.h> |
| 25 | |
| 26 | /* |
| 27 | * fill in basic accounting fields |
| 28 | */ |
| 29 | void bacct_add_tsk(struct user_namespace *user_ns, |
| 30 | struct pid_namespace *pid_ns, |
| 31 | struct taskstats *stats, struct task_struct *tsk) |
| 32 | { |
| 33 | const struct cred *tcred; |
| 34 | cputime_t utime, stime, utimescaled, stimescaled; |
| 35 | u64 delta; |
| 36 | |
| 37 | BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); |
| 38 | |
| 39 | /* calculate task elapsed time in nsec */ |
| 40 | delta = ktime_get_ns() - tsk->start_time; |
| 41 | /* Convert to micro seconds */ |
| 42 | do_div(delta, NSEC_PER_USEC); |
| 43 | stats->ac_etime = delta; |
| 44 | /* Convert to seconds for btime */ |
| 45 | do_div(delta, USEC_PER_SEC); |
| 46 | stats->ac_btime = get_seconds() - delta; |
| 47 | if (thread_group_leader(tsk)) { |
| 48 | stats->ac_exitcode = tsk->exit_code; |
| 49 | if (tsk->flags & PF_FORKNOEXEC) |
| 50 | stats->ac_flag |= AFORK; |
| 51 | } |
| 52 | if (tsk->flags & PF_SUPERPRIV) |
| 53 | stats->ac_flag |= ASU; |
| 54 | if (tsk->flags & PF_DUMPCORE) |
| 55 | stats->ac_flag |= ACORE; |
| 56 | if (tsk->flags & PF_SIGNALED) |
| 57 | stats->ac_flag |= AXSIG; |
| 58 | stats->ac_nice = task_nice(tsk); |
| 59 | stats->ac_sched = tsk->policy; |
| 60 | stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); |
| 61 | rcu_read_lock(); |
| 62 | tcred = __task_cred(tsk); |
| 63 | stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); |
| 64 | stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); |
| 65 | stats->ac_ppid = pid_alive(tsk) ? |
| 66 | task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; |
| 67 | rcu_read_unlock(); |
| 68 | |
| 69 | task_cputime(tsk, &utime, &stime); |
| 70 | stats->ac_utime = cputime_to_usecs(utime); |
| 71 | stats->ac_stime = cputime_to_usecs(stime); |
| 72 | |
| 73 | task_cputime_scaled(tsk, &utimescaled, &stimescaled); |
| 74 | stats->ac_utimescaled = cputime_to_usecs(utimescaled); |
| 75 | stats->ac_stimescaled = cputime_to_usecs(stimescaled); |
| 76 | |
| 77 | stats->ac_minflt = tsk->min_flt; |
| 78 | stats->ac_majflt = tsk->maj_flt; |
| 79 | |
| 80 | strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); |
| 81 | } |
| 82 | |
| 83 | |
| 84 | #ifdef CONFIG_TASK_XACCT |
| 85 | |
| 86 | #define KB 1024 |
| 87 | #define MB (1024*KB) |
| 88 | #define KB_MASK (~(KB-1)) |
| 89 | /* |
| 90 | * fill in extended accounting fields |
| 91 | */ |
| 92 | void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) |
| 93 | { |
| 94 | struct mm_struct *mm; |
| 95 | |
| 96 | /* convert pages-usec to Mbyte-usec */ |
| 97 | stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB; |
| 98 | stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB; |
| 99 | mm = get_task_mm(p); |
| 100 | if (mm) { |
| 101 | /* adjust to KB unit */ |
| 102 | stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; |
| 103 | stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; |
| 104 | mmput(mm); |
| 105 | } |
| 106 | stats->read_char = p->ioac.rchar & KB_MASK; |
| 107 | stats->write_char = p->ioac.wchar & KB_MASK; |
| 108 | stats->read_syscalls = p->ioac.syscr & KB_MASK; |
| 109 | stats->write_syscalls = p->ioac.syscw & KB_MASK; |
| 110 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
| 111 | stats->read_bytes = p->ioac.read_bytes & KB_MASK; |
| 112 | stats->write_bytes = p->ioac.write_bytes & KB_MASK; |
| 113 | stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; |
| 114 | #else |
| 115 | stats->read_bytes = 0; |
| 116 | stats->write_bytes = 0; |
| 117 | stats->cancelled_write_bytes = 0; |
| 118 | #endif |
| 119 | } |
| 120 | #undef KB |
| 121 | #undef MB |
| 122 | |
| 123 | static void __acct_update_integrals(struct task_struct *tsk, |
| 124 | cputime_t utime, cputime_t stime) |
| 125 | { |
| 126 | if (likely(tsk->mm)) { |
| 127 | cputime_t time, dtime; |
| 128 | struct timeval value; |
| 129 | unsigned long flags; |
| 130 | u64 delta; |
| 131 | |
| 132 | local_irq_save(flags); |
| 133 | time = stime + utime; |
| 134 | dtime = time - tsk->acct_timexpd; |
| 135 | jiffies_to_timeval(cputime_to_jiffies(dtime), &value); |
| 136 | delta = value.tv_sec; |
| 137 | delta = delta * USEC_PER_SEC + value.tv_usec; |
| 138 | |
| 139 | if (delta == 0) |
| 140 | goto out; |
| 141 | tsk->acct_timexpd = time; |
| 142 | tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); |
| 143 | tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; |
| 144 | out: |
| 145 | local_irq_restore(flags); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * acct_update_integrals - update mm integral fields in task_struct |
| 151 | * @tsk: task_struct for accounting |
| 152 | */ |
| 153 | void acct_update_integrals(struct task_struct *tsk) |
| 154 | { |
| 155 | cputime_t utime, stime; |
| 156 | |
| 157 | task_cputime(tsk, &utime, &stime); |
| 158 | __acct_update_integrals(tsk, utime, stime); |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * acct_account_cputime - update mm integral after cputime update |
| 163 | * @tsk: task_struct for accounting |
| 164 | */ |
| 165 | void acct_account_cputime(struct task_struct *tsk) |
| 166 | { |
| 167 | __acct_update_integrals(tsk, tsk->utime, tsk->stime); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * acct_clear_integrals - clear the mm integral fields in task_struct |
| 172 | * @tsk: task_struct whose accounting fields are cleared |
| 173 | */ |
| 174 | void acct_clear_integrals(struct task_struct *tsk) |
| 175 | { |
| 176 | tsk->acct_timexpd = 0; |
| 177 | tsk->acct_rss_mem1 = 0; |
| 178 | tsk->acct_vm_mem1 = 0; |
| 179 | } |
| 180 | #endif |