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/tsacct_kern.h> 23 #include <linux/acct.h> 24 #include <linux/jiffies.h> 25 #include <linux/mm.h> 26 27 /* 28 * fill in basic accounting fields 29 */ 30 void bacct_add_tsk(struct user_namespace *user_ns, 31 struct pid_namespace *pid_ns, 32 struct taskstats *stats, struct task_struct *tsk) 33 { 34 const struct cred *tcred; 35 u64 utime, stime, utimescaled, stimescaled; 36 u64 delta; 37 38 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); 39 40 /* calculate task elapsed time in nsec */ 41 delta = ktime_get_ns() - tsk->start_time; 42 /* Convert to micro seconds */ 43 do_div(delta, NSEC_PER_USEC); 44 stats->ac_etime = delta; 45 /* Convert to seconds for btime */ 46 do_div(delta, USEC_PER_SEC); 47 stats->ac_btime = get_seconds() - delta; 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 = div_u64(utime, NSEC_PER_USEC); 72 stats->ac_stime = div_u64(stime, NSEC_PER_USEC); 73 74 task_cputime_scaled(tsk, &utimescaled, &stimescaled); 75 stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC); 76 stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC); 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-nsec/1024 to Mbyte-usec, see __acct_update_integrals */ 98 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE; 99 do_div(stats->coremem, 1000 * KB); 100 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE; 101 do_div(stats->virtmem, 1000 * KB); 102 mm = get_task_mm(p); 103 if (mm) { 104 /* adjust to KB unit */ 105 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; 106 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; 107 mmput(mm); 108 } 109 stats->read_char = p->ioac.rchar & KB_MASK; 110 stats->write_char = p->ioac.wchar & KB_MASK; 111 stats->read_syscalls = p->ioac.syscr & KB_MASK; 112 stats->write_syscalls = p->ioac.syscw & KB_MASK; 113 #ifdef CONFIG_TASK_IO_ACCOUNTING 114 stats->read_bytes = p->ioac.read_bytes & KB_MASK; 115 stats->write_bytes = p->ioac.write_bytes & KB_MASK; 116 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; 117 #else 118 stats->read_bytes = 0; 119 stats->write_bytes = 0; 120 stats->cancelled_write_bytes = 0; 121 #endif 122 } 123 #undef KB 124 #undef MB 125 126 static void __acct_update_integrals(struct task_struct *tsk, 127 u64 utime, u64 stime) 128 { 129 u64 time, delta; 130 131 if (!likely(tsk->mm)) 132 return; 133 134 time = stime + utime; 135 delta = time - tsk->acct_timexpd; 136 137 if (delta < TICK_NSEC) 138 return; 139 140 tsk->acct_timexpd = time; 141 /* 142 * Divide by 1024 to avoid overflow, and to avoid division. 143 * The final unit reported to userspace is Mbyte-usecs, 144 * the rest of the math is done in xacct_add_tsk. 145 */ 146 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10; 147 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10; 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 u64 utime, stime; 157 unsigned long flags; 158 159 local_irq_save(flags); 160 task_cputime(tsk, &utime, &stime); 161 __acct_update_integrals(tsk, utime, stime); 162 local_irq_restore(flags); 163 } 164 165 /** 166 * acct_account_cputime - update mm integral after cputime update 167 * @tsk: task_struct for accounting 168 */ 169 void acct_account_cputime(struct task_struct *tsk) 170 { 171 __acct_update_integrals(tsk, tsk->utime, tsk->stime); 172 } 173 174 /** 175 * acct_clear_integrals - clear the mm integral fields in task_struct 176 * @tsk: task_struct whose accounting fields are cleared 177 */ 178 void acct_clear_integrals(struct task_struct *tsk) 179 { 180 tsk->acct_timexpd = 0; 181 tsk->acct_rss_mem1 = 0; 182 tsk->acct_vm_mem1 = 0; 183 } 184 #endif 185