| /* |
| * tsacct.c - System accounting over taskstats interface |
| * |
| * Copyright (C) Jay Lan, <jlan@sgi.com> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/tsacct_kern.h> |
| #include <linux/acct.h> |
| #include <linux/jiffies.h> |
| #include <linux/mm.h> |
| |
| /* |
| * fill in basic accounting fields |
| */ |
| void bacct_add_tsk(struct user_namespace *user_ns, |
| struct pid_namespace *pid_ns, |
| struct taskstats *stats, struct task_struct *tsk) |
| { |
| const struct cred *tcred; |
| u64 utime, stime, utimescaled, stimescaled; |
| u64 delta; |
| |
| BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); |
| |
| /* calculate task elapsed time in nsec */ |
| delta = ktime_get_ns() - tsk->start_time; |
| /* Convert to micro seconds */ |
| do_div(delta, NSEC_PER_USEC); |
| stats->ac_etime = delta; |
| /* Convert to seconds for btime */ |
| do_div(delta, USEC_PER_SEC); |
| stats->ac_btime = get_seconds() - delta; |
| if (thread_group_leader(tsk)) { |
| stats->ac_exitcode = tsk->exit_code; |
| if (tsk->flags & PF_FORKNOEXEC) |
| stats->ac_flag |= AFORK; |
| } |
| if (tsk->flags & PF_SUPERPRIV) |
| stats->ac_flag |= ASU; |
| if (tsk->flags & PF_DUMPCORE) |
| stats->ac_flag |= ACORE; |
| if (tsk->flags & PF_SIGNALED) |
| stats->ac_flag |= AXSIG; |
| stats->ac_nice = task_nice(tsk); |
| stats->ac_sched = tsk->policy; |
| stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); |
| rcu_read_lock(); |
| tcred = __task_cred(tsk); |
| stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); |
| stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); |
| stats->ac_ppid = pid_alive(tsk) ? |
| task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; |
| rcu_read_unlock(); |
| |
| task_cputime(tsk, &utime, &stime); |
| stats->ac_utime = div_u64(utime, NSEC_PER_USEC); |
| stats->ac_stime = div_u64(stime, NSEC_PER_USEC); |
| |
| task_cputime_scaled(tsk, &utimescaled, &stimescaled); |
| stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC); |
| stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC); |
| |
| stats->ac_minflt = tsk->min_flt; |
| stats->ac_majflt = tsk->maj_flt; |
| |
| strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); |
| } |
| |
| |
| #ifdef CONFIG_TASK_XACCT |
| |
| #define KB 1024 |
| #define MB (1024*KB) |
| #define KB_MASK (~(KB-1)) |
| /* |
| * fill in extended accounting fields |
| */ |
| void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) |
| { |
| struct mm_struct *mm; |
| |
| /* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */ |
| stats->coremem = p->acct_rss_mem1 * PAGE_SIZE; |
| do_div(stats->coremem, 1000 * KB); |
| stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE; |
| do_div(stats->virtmem, 1000 * KB); |
| mm = get_task_mm(p); |
| if (mm) { |
| /* adjust to KB unit */ |
| stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; |
| stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; |
| mmput(mm); |
| } |
| stats->read_char = p->ioac.rchar & KB_MASK; |
| stats->write_char = p->ioac.wchar & KB_MASK; |
| stats->read_syscalls = p->ioac.syscr & KB_MASK; |
| stats->write_syscalls = p->ioac.syscw & KB_MASK; |
| #ifdef CONFIG_TASK_IO_ACCOUNTING |
| stats->read_bytes = p->ioac.read_bytes & KB_MASK; |
| stats->write_bytes = p->ioac.write_bytes & KB_MASK; |
| stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; |
| #else |
| stats->read_bytes = 0; |
| stats->write_bytes = 0; |
| stats->cancelled_write_bytes = 0; |
| #endif |
| } |
| #undef KB |
| #undef MB |
| |
| static void __acct_update_integrals(struct task_struct *tsk, |
| u64 utime, u64 stime) |
| { |
| u64 time, delta; |
| |
| if (!likely(tsk->mm)) |
| return; |
| |
| time = stime + utime; |
| delta = time - tsk->acct_timexpd; |
| |
| if (delta < TICK_NSEC) |
| return; |
| |
| tsk->acct_timexpd = time; |
| /* |
| * Divide by 1024 to avoid overflow, and to avoid division. |
| * The final unit reported to userspace is Mbyte-usecs, |
| * the rest of the math is done in xacct_add_tsk. |
| */ |
| tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10; |
| tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10; |
| } |
| |
| /** |
| * acct_update_integrals - update mm integral fields in task_struct |
| * @tsk: task_struct for accounting |
| */ |
| void acct_update_integrals(struct task_struct *tsk) |
| { |
| u64 utime, stime; |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| task_cputime(tsk, &utime, &stime); |
| __acct_update_integrals(tsk, utime, stime); |
| local_irq_restore(flags); |
| } |
| |
| /** |
| * acct_account_cputime - update mm integral after cputime update |
| * @tsk: task_struct for accounting |
| */ |
| void acct_account_cputime(struct task_struct *tsk) |
| { |
| __acct_update_integrals(tsk, tsk->utime, tsk->stime); |
| } |
| |
| /** |
| * acct_clear_integrals - clear the mm integral fields in task_struct |
| * @tsk: task_struct whose accounting fields are cleared |
| */ |
| void acct_clear_integrals(struct task_struct *tsk) |
| { |
| tsk->acct_timexpd = 0; |
| tsk->acct_rss_mem1 = 0; |
| tsk->acct_vm_mem1 = 0; |
| } |
| #endif |