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 cputime_t utime, stime, utimescaled, stimescaled; 35 u64 delta; 36 37 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); 38 39 /* calculate task elapsed time in nsec */ 40 delta = ktime_get_ns() - tsk->start_time; 41 /* Convert to micro seconds */ 42 do_div(delta, NSEC_PER_USEC); 43 stats->ac_etime = delta; 44 /* Convert to seconds for btime */ 45 do_div(delta, USEC_PER_SEC); 46 stats->ac_btime = get_seconds() - delta; 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 69 task_cputime(tsk, &utime, &stime); 70 stats->ac_utime = cputime_to_usecs(utime); 71 stats->ac_stime = cputime_to_usecs(stime); 72 73 task_cputime_scaled(tsk, &utimescaled, &stimescaled); 74 stats->ac_utimescaled = cputime_to_usecs(utimescaled); 75 stats->ac_stimescaled = cputime_to_usecs(stimescaled); 76 77 stats->ac_minflt = tsk->min_flt; 78 stats->ac_majflt = tsk->maj_flt; 79 80 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); 81 } 82 83 84 #ifdef CONFIG_TASK_XACCT 85 86 #define KB 1024 87 #define MB (1024*KB) 88 #define KB_MASK (~(KB-1)) 89 /* 90 * fill in extended accounting fields 91 */ 92 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) 93 { 94 struct mm_struct *mm; 95 96 /* convert pages-usec to Mbyte-usec */ 97 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB; 98 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB; 99 mm = get_task_mm(p); 100 if (mm) { 101 /* adjust to KB unit */ 102 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; 103 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; 104 mmput(mm); 105 } 106 stats->read_char = p->ioac.rchar & KB_MASK; 107 stats->write_char = p->ioac.wchar & KB_MASK; 108 stats->read_syscalls = p->ioac.syscr & KB_MASK; 109 stats->write_syscalls = p->ioac.syscw & KB_MASK; 110 #ifdef CONFIG_TASK_IO_ACCOUNTING 111 stats->read_bytes = p->ioac.read_bytes & KB_MASK; 112 stats->write_bytes = p->ioac.write_bytes & KB_MASK; 113 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; 114 #else 115 stats->read_bytes = 0; 116 stats->write_bytes = 0; 117 stats->cancelled_write_bytes = 0; 118 #endif 119 } 120 #undef KB 121 #undef MB 122 123 static void __acct_update_integrals(struct task_struct *tsk, 124 cputime_t utime, cputime_t stime) 125 { 126 if (likely(tsk->mm)) { 127 cputime_t time, dtime; 128 struct timeval value; 129 unsigned long flags; 130 u64 delta; 131 132 local_irq_save(flags); 133 time = stime + utime; 134 dtime = time - tsk->acct_timexpd; 135 jiffies_to_timeval(cputime_to_jiffies(dtime), &value); 136 delta = value.tv_sec; 137 delta = delta * USEC_PER_SEC + value.tv_usec; 138 139 if (delta == 0) 140 goto out; 141 tsk->acct_timexpd = time; 142 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); 143 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; 144 out: 145 local_irq_restore(flags); 146 } 147 } 148 149 /** 150 * acct_update_integrals - update mm integral fields in task_struct 151 * @tsk: task_struct for accounting 152 */ 153 void acct_update_integrals(struct task_struct *tsk) 154 { 155 cputime_t utime, stime; 156 157 task_cputime(tsk, &utime, &stime); 158 __acct_update_integrals(tsk, utime, stime); 159 } 160 161 /** 162 * acct_account_cputime - update mm integral after cputime update 163 * @tsk: task_struct for accounting 164 */ 165 void acct_account_cputime(struct task_struct *tsk) 166 { 167 __acct_update_integrals(tsk, tsk->utime, tsk->stime); 168 } 169 170 /** 171 * acct_clear_integrals - clear the mm integral fields in task_struct 172 * @tsk: task_struct whose accounting fields are cleared 173 */ 174 void acct_clear_integrals(struct task_struct *tsk) 175 { 176 tsk->acct_timexpd = 0; 177 tsk->acct_rss_mem1 = 0; 178 tsk->acct_vm_mem1 = 0; 179 } 180 #endif 181