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-nsec/1024 to Mbyte-usec, see __acct_update_integrals */ 97 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE; 98 do_div(stats->coremem, 1000 * KB); 99 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE; 100 do_div(stats->virtmem, 1000 * KB); 101 mm = get_task_mm(p); 102 if (mm) { 103 /* adjust to KB unit */ 104 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; 105 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; 106 mmput(mm); 107 } 108 stats->read_char = p->ioac.rchar & KB_MASK; 109 stats->write_char = p->ioac.wchar & KB_MASK; 110 stats->read_syscalls = p->ioac.syscr & KB_MASK; 111 stats->write_syscalls = p->ioac.syscw & KB_MASK; 112 #ifdef CONFIG_TASK_IO_ACCOUNTING 113 stats->read_bytes = p->ioac.read_bytes & KB_MASK; 114 stats->write_bytes = p->ioac.write_bytes & KB_MASK; 115 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; 116 #else 117 stats->read_bytes = 0; 118 stats->write_bytes = 0; 119 stats->cancelled_write_bytes = 0; 120 #endif 121 } 122 #undef KB 123 #undef MB 124 125 static void __acct_update_integrals(struct task_struct *tsk, 126 cputime_t utime, cputime_t stime) 127 { 128 if (likely(tsk->mm)) { 129 cputime_t time, dtime; 130 unsigned long flags; 131 u64 delta; 132 133 local_irq_save(flags); 134 time = stime + utime; 135 dtime = time - tsk->acct_timexpd; 136 /* Avoid division: cputime_t is often in nanoseconds already. */ 137 delta = cputime_to_nsecs(dtime); 138 139 if (delta < TICK_NSEC) 140 goto out; 141 142 tsk->acct_timexpd = time; 143 /* 144 * Divide by 1024 to avoid overflow, and to avoid division. 145 * The final unit reported to userspace is Mbyte-usecs, 146 * the rest of the math is done in xacct_add_tsk. 147 */ 148 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10; 149 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10; 150 out: 151 local_irq_restore(flags); 152 } 153 } 154 155 /** 156 * acct_update_integrals - update mm integral fields in task_struct 157 * @tsk: task_struct for accounting 158 */ 159 void acct_update_integrals(struct task_struct *tsk) 160 { 161 cputime_t utime, stime; 162 163 task_cputime(tsk, &utime, &stime); 164 __acct_update_integrals(tsk, utime, stime); 165 } 166 167 /** 168 * acct_account_cputime - update mm integral after cputime update 169 * @tsk: task_struct for accounting 170 */ 171 void acct_account_cputime(struct task_struct *tsk) 172 { 173 __acct_update_integrals(tsk, tsk->utime, tsk->stime); 174 } 175 176 /** 177 * acct_clear_integrals - clear the mm integral fields in task_struct 178 * @tsk: task_struct whose accounting fields are cleared 179 */ 180 void acct_clear_integrals(struct task_struct *tsk) 181 { 182 tsk->acct_timexpd = 0; 183 tsk->acct_rss_mem1 = 0; 184 tsk->acct_vm_mem1 = 0; 185 } 186 #endif 187