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 struct timespec uptime, ts; 35 u64 ac_etime; 36 37 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); 38 39 /* calculate task elapsed time in timespec */ 40 do_posix_clock_monotonic_gettime(&uptime); 41 ts = timespec_sub(uptime, tsk->start_time); 42 /* rebase elapsed time to usec (should never be negative) */ 43 ac_etime = timespec_to_ns(&ts); 44 do_div(ac_etime, NSEC_PER_USEC); 45 stats->ac_etime = ac_etime; 46 stats->ac_btime = get_seconds() - ts.tv_sec; 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 stats->ac_utime = cputime_to_usecs(tsk->utime); 69 stats->ac_stime = cputime_to_usecs(tsk->stime); 70 stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled); 71 stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled); 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 #define KB_MASK (~(KB-1)) 84 /* 85 * fill in extended accounting fields 86 */ 87 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) 88 { 89 struct mm_struct *mm; 90 91 /* convert pages-usec to Mbyte-usec */ 92 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB; 93 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB; 94 mm = get_task_mm(p); 95 if (mm) { 96 /* adjust to KB unit */ 97 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; 98 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; 99 mmput(mm); 100 } 101 stats->read_char = p->ioac.rchar & KB_MASK; 102 stats->write_char = p->ioac.wchar & KB_MASK; 103 stats->read_syscalls = p->ioac.syscr & KB_MASK; 104 stats->write_syscalls = p->ioac.syscw & KB_MASK; 105 #ifdef CONFIG_TASK_IO_ACCOUNTING 106 stats->read_bytes = p->ioac.read_bytes & KB_MASK; 107 stats->write_bytes = p->ioac.write_bytes & KB_MASK; 108 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; 109 #else 110 stats->read_bytes = 0; 111 stats->write_bytes = 0; 112 stats->cancelled_write_bytes = 0; 113 #endif 114 } 115 #undef KB 116 #undef MB 117 118 /** 119 * acct_update_integrals - update mm integral fields in task_struct 120 * @tsk: task_struct for accounting 121 */ 122 void acct_update_integrals(struct task_struct *tsk) 123 { 124 if (likely(tsk->mm)) { 125 cputime_t time, dtime; 126 struct timeval value; 127 unsigned long flags; 128 u64 delta; 129 130 local_irq_save(flags); 131 time = tsk->stime + tsk->utime; 132 dtime = time - tsk->acct_timexpd; 133 jiffies_to_timeval(cputime_to_jiffies(dtime), &value); 134 delta = value.tv_sec; 135 delta = delta * USEC_PER_SEC + value.tv_usec; 136 137 if (delta == 0) 138 goto out; 139 tsk->acct_timexpd = time; 140 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); 141 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; 142 out: 143 local_irq_restore(flags); 144 } 145 } 146 147 /** 148 * acct_clear_integrals - clear the mm integral fields in task_struct 149 * @tsk: task_struct whose accounting fields are cleared 150 */ 151 void acct_clear_integrals(struct task_struct *tsk) 152 { 153 tsk->acct_timexpd = 0; 154 tsk->acct_rss_mem1 = 0; 155 tsk->acct_vm_mem1 = 0; 156 } 157 #endif 158