1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * tsacct.c - System accounting over taskstats interface 4 * 5 * Copyright (C) Jay Lan, <jlan@sgi.com> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/sched/signal.h> 10 #include <linux/sched/mm.h> 11 #include <linux/sched/cputime.h> 12 #include <linux/tsacct_kern.h> 13 #include <linux/acct.h> 14 #include <linux/jiffies.h> 15 #include <linux/mm.h> 16 17 /* 18 * fill in basic accounting fields 19 */ 20 void bacct_add_tsk(struct user_namespace *user_ns, 21 struct pid_namespace *pid_ns, 22 struct taskstats *stats, struct task_struct *tsk) 23 { 24 const struct cred *tcred; 25 u64 utime, stime, utimescaled, stimescaled; 26 u64 delta; 27 28 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); 29 30 /* calculate task elapsed time in nsec */ 31 delta = ktime_get_ns() - tsk->start_time; 32 /* Convert to micro seconds */ 33 do_div(delta, NSEC_PER_USEC); 34 stats->ac_etime = delta; 35 /* Convert to seconds for btime */ 36 do_div(delta, USEC_PER_SEC); 37 stats->ac_btime = get_seconds() - delta; 38 if (thread_group_leader(tsk)) { 39 stats->ac_exitcode = tsk->exit_code; 40 if (tsk->flags & PF_FORKNOEXEC) 41 stats->ac_flag |= AFORK; 42 } 43 if (tsk->flags & PF_SUPERPRIV) 44 stats->ac_flag |= ASU; 45 if (tsk->flags & PF_DUMPCORE) 46 stats->ac_flag |= ACORE; 47 if (tsk->flags & PF_SIGNALED) 48 stats->ac_flag |= AXSIG; 49 stats->ac_nice = task_nice(tsk); 50 stats->ac_sched = tsk->policy; 51 stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); 52 rcu_read_lock(); 53 tcred = __task_cred(tsk); 54 stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); 55 stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); 56 stats->ac_ppid = pid_alive(tsk) ? 57 task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; 58 rcu_read_unlock(); 59 60 task_cputime(tsk, &utime, &stime); 61 stats->ac_utime = div_u64(utime, NSEC_PER_USEC); 62 stats->ac_stime = div_u64(stime, NSEC_PER_USEC); 63 64 task_cputime_scaled(tsk, &utimescaled, &stimescaled); 65 stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC); 66 stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC); 67 68 stats->ac_minflt = tsk->min_flt; 69 stats->ac_majflt = tsk->maj_flt; 70 71 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); 72 } 73 74 75 #ifdef CONFIG_TASK_XACCT 76 77 #define KB 1024 78 #define MB (1024*KB) 79 #define KB_MASK (~(KB-1)) 80 /* 81 * fill in extended accounting fields 82 */ 83 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) 84 { 85 struct mm_struct *mm; 86 87 /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */ 88 stats->coremem = p->acct_rss_mem1 * PAGE_SIZE; 89 do_div(stats->coremem, 1000 * KB); 90 stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE; 91 do_div(stats->virtmem, 1000 * KB); 92 mm = get_task_mm(p); 93 if (mm) { 94 /* adjust to KB unit */ 95 stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; 96 stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; 97 mmput(mm); 98 } 99 stats->read_char = p->ioac.rchar & KB_MASK; 100 stats->write_char = p->ioac.wchar & KB_MASK; 101 stats->read_syscalls = p->ioac.syscr & KB_MASK; 102 stats->write_syscalls = p->ioac.syscw & KB_MASK; 103 #ifdef CONFIG_TASK_IO_ACCOUNTING 104 stats->read_bytes = p->ioac.read_bytes & KB_MASK; 105 stats->write_bytes = p->ioac.write_bytes & KB_MASK; 106 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; 107 #else 108 stats->read_bytes = 0; 109 stats->write_bytes = 0; 110 stats->cancelled_write_bytes = 0; 111 #endif 112 } 113 #undef KB 114 #undef MB 115 116 static void __acct_update_integrals(struct task_struct *tsk, 117 u64 utime, u64 stime) 118 { 119 u64 time, delta; 120 121 if (!likely(tsk->mm)) 122 return; 123 124 time = stime + utime; 125 delta = time - tsk->acct_timexpd; 126 127 if (delta < TICK_NSEC) 128 return; 129 130 tsk->acct_timexpd = time; 131 /* 132 * Divide by 1024 to avoid overflow, and to avoid division. 133 * The final unit reported to userspace is Mbyte-usecs, 134 * the rest of the math is done in xacct_add_tsk. 135 */ 136 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10; 137 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10; 138 } 139 140 /** 141 * acct_update_integrals - update mm integral fields in task_struct 142 * @tsk: task_struct for accounting 143 */ 144 void acct_update_integrals(struct task_struct *tsk) 145 { 146 u64 utime, stime; 147 unsigned long flags; 148 149 local_irq_save(flags); 150 task_cputime(tsk, &utime, &stime); 151 __acct_update_integrals(tsk, utime, stime); 152 local_irq_restore(flags); 153 } 154 155 /** 156 * acct_account_cputime - update mm integral after cputime update 157 * @tsk: task_struct for accounting 158 */ 159 void acct_account_cputime(struct task_struct *tsk) 160 { 161 __acct_update_integrals(tsk, tsk->utime, tsk->stime); 162 } 163 164 /** 165 * acct_clear_integrals - clear the mm integral fields in task_struct 166 * @tsk: task_struct whose accounting fields are cleared 167 */ 168 void acct_clear_integrals(struct task_struct *tsk) 169 { 170 tsk->acct_timexpd = 0; 171 tsk->acct_rss_mem1 = 0; 172 tsk->acct_vm_mem1 = 0; 173 } 174 #endif 175