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/signal.h> 21 #include <linux/sched/mm.h> 22 #include <linux/sched/cputime.h> 23 #include <linux/tsacct_kern.h> 24 #include <linux/acct.h> 25 #include <linux/jiffies.h> 26 #include <linux/mm.h> 27 28 /* 29 * fill in basic accounting fields 30 */ 31 void bacct_add_tsk(struct user_namespace *user_ns, 32 struct pid_namespace *pid_ns, 33 struct taskstats *stats, struct task_struct *tsk) 34 { 35 const struct cred *tcred; 36 u64 utime, stime, utimescaled, stimescaled; 37 u64 delta; 38 39 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); 40 41 /* calculate task elapsed time in nsec */ 42 delta = ktime_get_ns() - tsk->start_time; 43 /* Convert to micro seconds */ 44 do_div(delta, NSEC_PER_USEC); 45 stats->ac_etime = delta; 46 /* Convert to seconds for btime */ 47 do_div(delta, USEC_PER_SEC); 48 stats->ac_btime = get_seconds() - delta; 49 if (thread_group_leader(tsk)) { 50 stats->ac_exitcode = tsk->exit_code; 51 if (tsk->flags & PF_FORKNOEXEC) 52 stats->ac_flag |= AFORK; 53 } 54 if (tsk->flags & PF_SUPERPRIV) 55 stats->ac_flag |= ASU; 56 if (tsk->flags & PF_DUMPCORE) 57 stats->ac_flag |= ACORE; 58 if (tsk->flags & PF_SIGNALED) 59 stats->ac_flag |= AXSIG; 60 stats->ac_nice = task_nice(tsk); 61 stats->ac_sched = tsk->policy; 62 stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); 63 rcu_read_lock(); 64 tcred = __task_cred(tsk); 65 stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); 66 stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); 67 stats->ac_ppid = pid_alive(tsk) ? 68 task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; 69 rcu_read_unlock(); 70 71 task_cputime(tsk, &utime, &stime); 72 stats->ac_utime = div_u64(utime, NSEC_PER_USEC); 73 stats->ac_stime = div_u64(stime, NSEC_PER_USEC); 74 75 task_cputime_scaled(tsk, &utimescaled, &stimescaled); 76 stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC); 77 stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC); 78 79 stats->ac_minflt = tsk->min_flt; 80 stats->ac_majflt = tsk->maj_flt; 81 82 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); 83 } 84 85 86 #ifdef CONFIG_TASK_XACCT 87 88 #define KB 1024 89 #define MB (1024*KB) 90 #define KB_MASK (~(KB-1)) 91 /* 92 * fill in extended accounting fields 93 */ 94 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) 95 { 96 struct mm_struct *mm; 97 98 /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */ 99 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE; 100 do_div(stats->coremem, 1000 * KB); 101 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE; 102 do_div(stats->virtmem, 1000 * KB); 103 mm = get_task_mm(p); 104 if (mm) { 105 /* adjust to KB unit */ 106 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; 107 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; 108 mmput(mm); 109 } 110 stats->read_char = p->ioac.rchar & KB_MASK; 111 stats->write_char = p->ioac.wchar & KB_MASK; 112 stats->read_syscalls = p->ioac.syscr & KB_MASK; 113 stats->write_syscalls = p->ioac.syscw & KB_MASK; 114 #ifdef CONFIG_TASK_IO_ACCOUNTING 115 stats->read_bytes = p->ioac.read_bytes & KB_MASK; 116 stats->write_bytes = p->ioac.write_bytes & KB_MASK; 117 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; 118 #else 119 stats->read_bytes = 0; 120 stats->write_bytes = 0; 121 stats->cancelled_write_bytes = 0; 122 #endif 123 } 124 #undef KB 125 #undef MB 126 127 static void __acct_update_integrals(struct task_struct *tsk, 128 u64 utime, u64 stime) 129 { 130 u64 time, delta; 131 132 if (!likely(tsk->mm)) 133 return; 134 135 time = stime + utime; 136 delta = time - tsk->acct_timexpd; 137 138 if (delta < TICK_NSEC) 139 return; 140 141 tsk->acct_timexpd = time; 142 /* 143 * Divide by 1024 to avoid overflow, and to avoid division. 144 * The final unit reported to userspace is Mbyte-usecs, 145 * the rest of the math is done in xacct_add_tsk. 146 */ 147 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10; 148 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10; 149 } 150 151 /** 152 * acct_update_integrals - update mm integral fields in task_struct 153 * @tsk: task_struct for accounting 154 */ 155 void acct_update_integrals(struct task_struct *tsk) 156 { 157 u64 utime, stime; 158 unsigned long flags; 159 160 local_irq_save(flags); 161 task_cputime(tsk, &utime, &stime); 162 __acct_update_integrals(tsk, utime, stime); 163 local_irq_restore(flags); 164 } 165 166 /** 167 * acct_account_cputime - update mm integral after cputime update 168 * @tsk: task_struct for accounting 169 */ 170 void acct_account_cputime(struct task_struct *tsk) 171 { 172 __acct_update_integrals(tsk, tsk->utime, tsk->stime); 173 } 174 175 /** 176 * acct_clear_integrals - clear the mm integral fields in task_struct 177 * @tsk: task_struct whose accounting fields are cleared 178 */ 179 void acct_clear_integrals(struct task_struct *tsk) 180 { 181 tsk->acct_timexpd = 0; 182 tsk->acct_rss_mem1 = 0; 183 tsk->acct_vm_mem1 = 0; 184 } 185 #endif 186