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| 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 taskstats *stats, struct task_struct *tsk) |
| 30 | { |
| 31 | const struct cred *tcred; |
| 32 | struct timespec uptime, ts; |
| 33 | u64 ac_etime; |
| 34 | |
| 35 | BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); |
| 36 | |
| 37 | /* calculate task elapsed time in timespec */ |
| 38 | do_posix_clock_monotonic_gettime(&uptime); |
| 39 | ts = timespec_sub(uptime, tsk->start_time); |
| 40 | /* rebase elapsed time to usec (should never be negative) */ |
| 41 | ac_etime = timespec_to_ns(&ts); |
| 42 | do_div(ac_etime, NSEC_PER_USEC); |
| 43 | stats->ac_etime = ac_etime; |
| 44 | stats->ac_btime = get_seconds() - ts.tv_sec; |
| 45 | if (thread_group_leader(tsk)) { |
| 46 | stats->ac_exitcode = tsk->exit_code; |
| 47 | if (tsk->flags & PF_FORKNOEXEC) |
| 48 | stats->ac_flag |= AFORK; |
| 49 | } |
| 50 | if (tsk->flags & PF_SUPERPRIV) |
| 51 | stats->ac_flag |= ASU; |
| 52 | if (tsk->flags & PF_DUMPCORE) |
| 53 | stats->ac_flag |= ACORE; |
| 54 | if (tsk->flags & PF_SIGNALED) |
| 55 | stats->ac_flag |= AXSIG; |
| 56 | stats->ac_nice = task_nice(tsk); |
| 57 | stats->ac_sched = tsk->policy; |
| 58 | stats->ac_pid = tsk->pid; |
| 59 | rcu_read_lock(); |
| 60 | tcred = __task_cred(tsk); |
| 61 | stats->ac_uid = tcred->uid; |
| 62 | stats->ac_gid = tcred->gid; |
| 63 | stats->ac_ppid = pid_alive(tsk) ? |
| 64 | rcu_dereference(tsk->real_parent)->tgid : 0; |
| 65 | rcu_read_unlock(); |
| 66 | stats->ac_utime = cputime_to_usecs(tsk->utime); |
| 67 | stats->ac_stime = cputime_to_usecs(tsk->stime); |
| 68 | stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled); |
| 69 | stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled); |
| 70 | stats->ac_minflt = tsk->min_flt; |
| 71 | stats->ac_majflt = tsk->maj_flt; |
| 72 | |
| 73 | strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); |
| 74 | } |
| 75 | |
| 76 | |
| 77 | #ifdef CONFIG_TASK_XACCT |
| 78 | |
| 79 | #define KB 1024 |
| 80 | #define MB (1024*KB) |
| 81 | /* |
| 82 | * fill in extended accounting fields |
| 83 | */ |
| 84 | void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) |
| 85 | { |
| 86 | struct mm_struct *mm; |
| 87 | |
| 88 | /* convert pages-usec to Mbyte-usec */ |
| 89 | stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB; |
| 90 | stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB; |
| 91 | mm = get_task_mm(p); |
| 92 | if (mm) { |
| 93 | /* adjust to KB unit */ |
| 94 | stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; |
| 95 | stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; |
| 96 | mmput(mm); |
| 97 | } |
| 98 | stats->read_char = p->ioac.rchar; |
| 99 | stats->write_char = p->ioac.wchar; |
| 100 | stats->read_syscalls = p->ioac.syscr; |
| 101 | stats->write_syscalls = p->ioac.syscw; |
| 102 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
| 103 | stats->read_bytes = p->ioac.read_bytes; |
| 104 | stats->write_bytes = p->ioac.write_bytes; |
| 105 | stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes; |
| 106 | #else |
| 107 | stats->read_bytes = 0; |
| 108 | stats->write_bytes = 0; |
| 109 | stats->cancelled_write_bytes = 0; |
| 110 | #endif |
| 111 | } |
| 112 | #undef KB |
| 113 | #undef MB |
| 114 | |
| 115 | /** |
| 116 | * acct_update_integrals - update mm integral fields in task_struct |
| 117 | * @tsk: task_struct for accounting |
| 118 | */ |
| 119 | void acct_update_integrals(struct task_struct *tsk) |
| 120 | { |
| 121 | if (likely(tsk->mm)) { |
| 122 | cputime_t time, dtime; |
| 123 | struct timeval value; |
| 124 | unsigned long flags; |
| 125 | u64 delta; |
| 126 | |
| 127 | local_irq_save(flags); |
| 128 | time = tsk->stime + tsk->utime; |
| 129 | dtime = cputime_sub(time, tsk->acct_timexpd); |
| 130 | jiffies_to_timeval(cputime_to_jiffies(dtime), &value); |
| 131 | delta = value.tv_sec; |
| 132 | delta = delta * USEC_PER_SEC + value.tv_usec; |
| 133 | |
| 134 | if (delta == 0) |
| 135 | goto out; |
| 136 | tsk->acct_timexpd = time; |
| 137 | tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); |
| 138 | tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; |
| 139 | out: |
| 140 | local_irq_restore(flags); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * acct_clear_integrals - clear the mm integral fields in task_struct |
| 146 | * @tsk: task_struct whose accounting fields are cleared |
| 147 | */ |
| 148 | void acct_clear_integrals(struct task_struct *tsk) |
| 149 | { |
| 150 | tsk->acct_timexpd = 0; |
| 151 | tsk->acct_rss_mem1 = 0; |
| 152 | tsk->acct_vm_mem1 = 0; |
| 153 | } |
| 154 | #endif |
| 155 |
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