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_msecs(tsk->utime) * USEC_PER_MSEC; 67 stats->ac_stime = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC; 68 stats->ac_utimescaled = 69 cputime_to_msecs(tsk->utimescaled) * USEC_PER_MSEC; 70 stats->ac_stimescaled = 71 cputime_to_msecs(tsk->stimescaled) * USEC_PER_MSEC; 72 stats->ac_minflt = tsk->min_flt; 73 stats->ac_majflt = tsk->maj_flt; 74 75 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); 76 } 77 78 79 #ifdef CONFIG_TASK_XACCT 80 81 #define KB 1024 82 #define MB (1024*KB) 83 /* 84 * fill in extended accounting fields 85 */ 86 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) 87 { 88 struct mm_struct *mm; 89 90 /* convert pages-usec to Mbyte-usec */ 91 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB; 92 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB; 93 mm = get_task_mm(p); 94 if (mm) { 95 /* adjust to KB unit */ 96 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; 97 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; 98 mmput(mm); 99 } 100 stats->read_char = p->ioac.rchar; 101 stats->write_char = p->ioac.wchar; 102 stats->read_syscalls = p->ioac.syscr; 103 stats->write_syscalls = p->ioac.syscw; 104 #ifdef CONFIG_TASK_IO_ACCOUNTING 105 stats->read_bytes = p->ioac.read_bytes; 106 stats->write_bytes = p->ioac.write_bytes; 107 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes; 108 #else 109 stats->read_bytes = 0; 110 stats->write_bytes = 0; 111 stats->cancelled_write_bytes = 0; 112 #endif 113 } 114 #undef KB 115 #undef MB 116 117 /** 118 * acct_update_integrals - update mm integral fields in task_struct 119 * @tsk: task_struct for accounting 120 */ 121 void acct_update_integrals(struct task_struct *tsk) 122 { 123 if (likely(tsk->mm)) { 124 cputime_t time, dtime; 125 struct timeval value; 126 unsigned long flags; 127 u64 delta; 128 129 local_irq_save(flags); 130 time = tsk->stime + tsk->utime; 131 dtime = cputime_sub(time, tsk->acct_timexpd); 132 jiffies_to_timeval(cputime_to_jiffies(dtime), &value); 133 delta = value.tv_sec; 134 delta = delta * USEC_PER_SEC + value.tv_usec; 135 136 if (delta == 0) 137 goto out; 138 tsk->acct_timexpd = time; 139 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); 140 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; 141 out: 142 local_irq_restore(flags); 143 } 144 } 145 146 /** 147 * acct_clear_integrals - clear the mm integral fields in task_struct 148 * @tsk: task_struct whose accounting fields are cleared 149 */ 150 void acct_clear_integrals(struct task_struct *tsk) 151 { 152 tsk->acct_timexpd = 0; 153 tsk->acct_rss_mem1 = 0; 154 tsk->acct_vm_mem1 = 0; 155 } 156 #endif 157