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 cputime_t utime, stime, utimescaled, stimescaled; 36 u64 ac_etime; 37 38 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); 39 40 /* calculate task elapsed time in timespec */ 41 do_posix_clock_monotonic_gettime(&uptime); 42 ts = timespec_sub(uptime, tsk->start_time); 43 /* rebase elapsed time to usec (should never be negative) */ 44 ac_etime = timespec_to_ns(&ts); 45 do_div(ac_etime, NSEC_PER_USEC); 46 stats->ac_etime = ac_etime; 47 stats->ac_btime = get_seconds() - ts.tv_sec; 48 if (thread_group_leader(tsk)) { 49 stats->ac_exitcode = tsk->exit_code; 50 if (tsk->flags & PF_FORKNOEXEC) 51 stats->ac_flag |= AFORK; 52 } 53 if (tsk->flags & PF_SUPERPRIV) 54 stats->ac_flag |= ASU; 55 if (tsk->flags & PF_DUMPCORE) 56 stats->ac_flag |= ACORE; 57 if (tsk->flags & PF_SIGNALED) 58 stats->ac_flag |= AXSIG; 59 stats->ac_nice = task_nice(tsk); 60 stats->ac_sched = tsk->policy; 61 stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); 62 rcu_read_lock(); 63 tcred = __task_cred(tsk); 64 stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); 65 stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); 66 stats->ac_ppid = pid_alive(tsk) ? 67 task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; 68 rcu_read_unlock(); 69 70 task_cputime(tsk, &utime, &stime); 71 stats->ac_utime = cputime_to_usecs(utime); 72 stats->ac_stime = cputime_to_usecs(stime); 73 74 task_cputime_scaled(tsk, &utimescaled, &stimescaled); 75 stats->ac_utimescaled = cputime_to_usecs(utimescaled); 76 stats->ac_stimescaled = cputime_to_usecs(stimescaled); 77 78 stats->ac_minflt = tsk->min_flt; 79 stats->ac_majflt = tsk->maj_flt; 80 81 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); 82 } 83 84 85 #ifdef CONFIG_TASK_XACCT 86 87 #define KB 1024 88 #define MB (1024*KB) 89 #define KB_MASK (~(KB-1)) 90 /* 91 * fill in extended accounting fields 92 */ 93 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) 94 { 95 struct mm_struct *mm; 96 97 /* convert pages-usec to Mbyte-usec */ 98 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB; 99 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB; 100 mm = get_task_mm(p); 101 if (mm) { 102 /* adjust to KB unit */ 103 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; 104 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; 105 mmput(mm); 106 } 107 stats->read_char = p->ioac.rchar & KB_MASK; 108 stats->write_char = p->ioac.wchar & KB_MASK; 109 stats->read_syscalls = p->ioac.syscr & KB_MASK; 110 stats->write_syscalls = p->ioac.syscw & KB_MASK; 111 #ifdef CONFIG_TASK_IO_ACCOUNTING 112 stats->read_bytes = p->ioac.read_bytes & KB_MASK; 113 stats->write_bytes = p->ioac.write_bytes & KB_MASK; 114 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; 115 #else 116 stats->read_bytes = 0; 117 stats->write_bytes = 0; 118 stats->cancelled_write_bytes = 0; 119 #endif 120 } 121 #undef KB 122 #undef MB 123 124 static void __acct_update_integrals(struct task_struct *tsk, 125 cputime_t utime, cputime_t stime) 126 { 127 if (likely(tsk->mm)) { 128 cputime_t time, dtime; 129 struct timeval value; 130 unsigned long flags; 131 u64 delta; 132 133 local_irq_save(flags); 134 time = stime + utime; 135 dtime = time - tsk->acct_timexpd; 136 jiffies_to_timeval(cputime_to_jiffies(dtime), &value); 137 delta = value.tv_sec; 138 delta = delta * USEC_PER_SEC + value.tv_usec; 139 140 if (delta == 0) 141 goto out; 142 tsk->acct_timexpd = time; 143 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); 144 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; 145 out: 146 local_irq_restore(flags); 147 } 148 } 149 150 /** 151 * acct_update_integrals - update mm integral fields in task_struct 152 * @tsk: task_struct for accounting 153 */ 154 void acct_update_integrals(struct task_struct *tsk) 155 { 156 cputime_t utime, stime; 157 158 task_cputime(tsk, &utime, &stime); 159 __acct_update_integrals(tsk, utime, stime); 160 } 161 162 /** 163 * acct_account_cputime - update mm integral after cputime update 164 * @tsk: task_struct for accounting 165 */ 166 void acct_account_cputime(struct task_struct *tsk) 167 { 168 __acct_update_integrals(tsk, tsk->utime, tsk->stime); 169 } 170 171 /** 172 * acct_clear_integrals - clear the mm integral fields in task_struct 173 * @tsk: task_struct whose accounting fields are cleared 174 */ 175 void acct_clear_integrals(struct task_struct *tsk) 176 { 177 tsk->acct_timexpd = 0; 178 tsk->acct_rss_mem1 = 0; 179 tsk->acct_vm_mem1 = 0; 180 } 181 #endif 182