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