| 1 | |
| 2 | * tsacct.c - System accounting over taskstats interface
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| 3 | *
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| 4 | * Copyright (C) Jay Lan, <[email protected]>
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| 5 | *
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| 6 | *
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| 7 | * This program is free software; you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation; either version 2 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * This program is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 |
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| 18 |
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| 19 | #include <linux/kernel.h>
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| 20 | #include <linux/sched.h>
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| 21 | #include <linux/tsacct_kern.h>
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| 22 | #include <linux/acct.h>
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| 23 | #include <linux/jiffies.h>
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| 24 | #include <linux/mm.h>
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| 25 |
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| 26 | |
| 27 | * fill in basic accounting fields
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| 28 |
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| 29 | void bacct_add_tsk(struct user_namespace *user_ns,
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| 30 | struct pid_namespace *pid_ns,
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| 31 | struct taskstats *stats, struct task_struct *tsk)
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| 32 | {
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| 33 | const struct cred *tcred;
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| 34 | struct timespec uptime, ts;
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| 35 | u64 ac_etime;
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| 36 |
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| 37 | BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
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| 38 |
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| 39 |
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| 40 | do_posix_clock_monotonic_gettime(&uptime);
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| 41 | ts = timespec_sub(uptime, tsk->start_time);
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| 42 |
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| 43 | ac_etime = timespec_to_ns(&ts);
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| 44 | do_div(ac_etime, NSEC_PER_USEC);
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| 45 | stats->ac_etime = ac_etime;
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| 46 | stats->ac_btime = get_seconds() - ts.tv_sec;
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| 47 | if (thread_group_leader(tsk)) {
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| 48 | stats->ac_exitcode = tsk->exit_code;
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| 49 | if (tsk->flags & PF_FORKNOEXEC)
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| 50 | stats->ac_flag |= AFORK;
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| 51 | }
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| 52 | if (tsk->flags & PF_SUPERPRIV)
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| 53 | stats->ac_flag |= ASU;
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| 54 | if (tsk->flags & PF_DUMPCORE)
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| 55 | stats->ac_flag |= ACORE;
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| 56 | if (tsk->flags & PF_SIGNALED)
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| 57 | stats->ac_flag |= AXSIG;
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| 58 | stats->ac_nice = task_nice(tsk);
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| 59 | stats->ac_sched = tsk->policy;
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| 60 | stats->ac_pid = task_pid_nr_ns(tsk, pid_ns);
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| 61 | rcu_read_lock();
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| 62 | tcred = __task_cred(tsk);
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| 63 | stats->ac_uid = from_kuid_munged(user_ns, tcred->uid);
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| 64 | stats->ac_gid = from_kgid_munged(user_ns, tcred->gid);
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| 65 | stats->ac_ppid = pid_alive(tsk) ?
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| 66 | task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
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| 67 | rcu_read_unlock();
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| 68 | stats->ac_utime = cputime_to_usecs(tsk->utime);
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| 69 | stats->ac_stime = cputime_to_usecs(tsk->stime);
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| 70 | stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled);
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| 71 | stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled);
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| 72 | stats->ac_minflt = tsk->min_flt;
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| 73 | stats->ac_majflt = tsk->maj_flt;
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| 74 |
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| 75 | strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
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| 76 | }
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| 77 |
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| 78 |
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| 79 | #ifdef CONFIG_TASK_XACCT
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| 80 |
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| 81 | #define KB 1024
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| 82 | #define MB (1024*KB)
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| 83 | #define KB_MASK (~(KB-1))
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| 84 | |
| 85 | * fill in extended accounting fields
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| 86 |
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| 87 | void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
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| 88 | {
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| 89 | struct mm_struct *mm;
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| 90 |
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| 91 |
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| 92 | stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
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| 93 | stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
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| 94 | mm = get_task_mm(p);
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| 95 | if (mm) {
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| 96 |
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| 97 | stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
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| 98 | stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
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| 99 | mmput(mm);
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| 100 | }
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| 101 | stats->read_char = p->ioac.rchar & KB_MASK;
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| 102 | stats->write_char = p->ioac.wchar & KB_MASK;
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| 103 | stats->read_syscalls = p->ioac.syscr & KB_MASK;
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| 104 | stats->write_syscalls = p->ioac.syscw & KB_MASK;
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| 105 | #ifdef CONFIG_TASK_IO_ACCOUNTING
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| 106 | stats->read_bytes = p->ioac.read_bytes & KB_MASK;
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| 107 | stats->write_bytes = p->ioac.write_bytes & KB_MASK;
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| 108 | stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
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| 109 | #else
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| 110 | stats->read_bytes = 0;
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| 111 | stats->write_bytes = 0;
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| 112 | stats->cancelled_write_bytes = 0;
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| 113 | #endif
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| 114 | }
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| 115 | #undef KB
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| 116 | #undef MB
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| 117 |
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| 118 | |
| 119 | * acct_update_integrals - update mm integral fields in task_struct
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| 120 | * @tsk: task_struct for accounting
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| 121 |
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| 122 | void acct_update_integrals(struct task_struct *tsk)
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| 123 | {
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| 124 | if (likely(tsk->mm)) {
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| 125 | cputime_t time, dtime;
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| 126 | struct timeval value;
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| 127 | unsigned long flags;
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| 128 | u64 delta;
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| 129 |
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| 130 | local_irq_save(flags);
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| 131 | time = tsk->stime + tsk->utime;
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| 132 | dtime = time - tsk->acct_timexpd;
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| 133 | jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
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| 134 | delta = value.tv_sec;
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| 135 | delta = delta * USEC_PER_SEC + value.tv_usec;
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| 136 |
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| 137 | if (delta == 0)
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| 138 | goto out;
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| 139 | tsk->acct_timexpd = time;
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| 140 | tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
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| 141 | tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
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| 142 | out:
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| 143 | local_irq_restore(flags);
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| 144 | }
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| 145 | }
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| 146 |
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| 147 | |
| 148 | * acct_clear_integrals - clear the mm integral fields in task_struct
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| 149 | * @tsk: task_struct whose accounting fields are cleared
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| 150 |
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| 151 | void acct_clear_integrals(struct task_struct *tsk)
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| 152 | {
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| 153 | tsk->acct_timexpd = 0;
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| 154 | tsk->acct_rss_mem1 = 0;
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| 155 | tsk->acct_vm_mem1 = 0;
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| 156 | }
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| 157 | #endif
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