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Linux/kernel/tsacct.c

  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         cputime_t time, dtime;
129         u64 delta;
130 
131         if (!likely(tsk->mm))
132                 return;
133 
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                 return;
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 }
151 
152 /**
153  * acct_update_integrals - update mm integral fields in task_struct
154  * @tsk: task_struct for accounting
155  */
156 void acct_update_integrals(struct task_struct *tsk)
157 {
158         cputime_t utime, stime;
159         unsigned long flags;
160 
161         local_irq_save(flags);
162         task_cputime(tsk, &utime, &stime);
163         __acct_update_integrals(tsk, utime, stime);
164         local_irq_restore(flags);
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 

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