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177 lines
4.7 KiB
177 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* tsacct.c - System accounting over taskstats interface |
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* |
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* Copyright (C) Jay Lan, <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/sched/signal.h> |
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#include <linux/sched/mm.h> |
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#include <linux/sched/cputime.h> |
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#include <linux/tsacct_kern.h> |
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#include <linux/acct.h> |
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#include <linux/jiffies.h> |
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#include <linux/mm.h> |
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/* |
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* fill in basic accounting fields |
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*/ |
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void bacct_add_tsk(struct user_namespace *user_ns, |
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struct pid_namespace *pid_ns, |
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struct taskstats *stats, struct task_struct *tsk) |
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{ |
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const struct cred *tcred; |
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u64 utime, stime, utimescaled, stimescaled; |
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u64 delta; |
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time64_t btime; |
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BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); |
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/* calculate task elapsed time in nsec */ |
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delta = ktime_get_ns() - tsk->start_time; |
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/* Convert to micro seconds */ |
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do_div(delta, NSEC_PER_USEC); |
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stats->ac_etime = delta; |
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/* Convert to seconds for btime (note y2106 limit) */ |
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btime = ktime_get_real_seconds() - div_u64(delta, USEC_PER_SEC); |
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stats->ac_btime = clamp_t(time64_t, btime, 0, U32_MAX); |
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stats->ac_btime64 = btime; |
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if (thread_group_leader(tsk)) { |
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stats->ac_exitcode = tsk->exit_code; |
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if (tsk->flags & PF_FORKNOEXEC) |
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stats->ac_flag |= AFORK; |
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} |
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if (tsk->flags & PF_SUPERPRIV) |
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stats->ac_flag |= ASU; |
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if (tsk->flags & PF_DUMPCORE) |
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stats->ac_flag |= ACORE; |
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if (tsk->flags & PF_SIGNALED) |
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stats->ac_flag |= AXSIG; |
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stats->ac_nice = task_nice(tsk); |
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stats->ac_sched = tsk->policy; |
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stats->ac_pid = task_pid_nr_ns(tsk, pid_ns); |
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rcu_read_lock(); |
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tcred = __task_cred(tsk); |
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stats->ac_uid = from_kuid_munged(user_ns, tcred->uid); |
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stats->ac_gid = from_kgid_munged(user_ns, tcred->gid); |
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stats->ac_ppid = pid_alive(tsk) ? |
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task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0; |
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rcu_read_unlock(); |
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task_cputime(tsk, &utime, &stime); |
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stats->ac_utime = div_u64(utime, NSEC_PER_USEC); |
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stats->ac_stime = div_u64(stime, NSEC_PER_USEC); |
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task_cputime_scaled(tsk, &utimescaled, &stimescaled); |
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stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC); |
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stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC); |
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stats->ac_minflt = tsk->min_flt; |
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stats->ac_majflt = tsk->maj_flt; |
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strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); |
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} |
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#ifdef CONFIG_TASK_XACCT |
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#define KB 1024 |
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#define MB (1024*KB) |
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#define KB_MASK (~(KB-1)) |
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/* |
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* fill in extended accounting fields |
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*/ |
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void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) |
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{ |
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struct mm_struct *mm; |
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/* convert pages-nsec/1024 to Mbyte-usec, see __acct_update_integrals */ |
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stats->coremem = p->acct_rss_mem1 * PAGE_SIZE; |
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do_div(stats->coremem, 1000 * KB); |
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stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE; |
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do_div(stats->virtmem, 1000 * KB); |
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mm = get_task_mm(p); |
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if (mm) { |
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/* adjust to KB unit */ |
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stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; |
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stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; |
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mmput(mm); |
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} |
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stats->read_char = p->ioac.rchar & KB_MASK; |
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stats->write_char = p->ioac.wchar & KB_MASK; |
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stats->read_syscalls = p->ioac.syscr & KB_MASK; |
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stats->write_syscalls = p->ioac.syscw & KB_MASK; |
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#ifdef CONFIG_TASK_IO_ACCOUNTING |
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stats->read_bytes = p->ioac.read_bytes & KB_MASK; |
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stats->write_bytes = p->ioac.write_bytes & KB_MASK; |
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stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK; |
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#else |
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stats->read_bytes = 0; |
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stats->write_bytes = 0; |
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stats->cancelled_write_bytes = 0; |
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#endif |
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} |
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#undef KB |
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#undef MB |
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static void __acct_update_integrals(struct task_struct *tsk, |
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u64 utime, u64 stime) |
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{ |
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u64 time, delta; |
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if (!likely(tsk->mm)) |
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return; |
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time = stime + utime; |
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delta = time - tsk->acct_timexpd; |
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if (delta < TICK_NSEC) |
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return; |
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tsk->acct_timexpd = time; |
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/* |
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* Divide by 1024 to avoid overflow, and to avoid division. |
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* The final unit reported to userspace is Mbyte-usecs, |
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* the rest of the math is done in xacct_add_tsk. |
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*/ |
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tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10; |
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tsk->acct_vm_mem1 += delta * tsk->mm->total_vm >> 10; |
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} |
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/** |
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* acct_update_integrals - update mm integral fields in task_struct |
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* @tsk: task_struct for accounting |
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*/ |
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void acct_update_integrals(struct task_struct *tsk) |
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{ |
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u64 utime, stime; |
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unsigned long flags; |
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local_irq_save(flags); |
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task_cputime(tsk, &utime, &stime); |
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__acct_update_integrals(tsk, utime, stime); |
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local_irq_restore(flags); |
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} |
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/** |
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* acct_account_cputime - update mm integral after cputime update |
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* @tsk: task_struct for accounting |
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*/ |
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void acct_account_cputime(struct task_struct *tsk) |
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{ |
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__acct_update_integrals(tsk, tsk->utime, tsk->stime); |
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} |
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/** |
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* acct_clear_integrals - clear the mm integral fields in task_struct |
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* @tsk: task_struct whose accounting fields are cleared |
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*/ |
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void acct_clear_integrals(struct task_struct *tsk) |
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{ |
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tsk->acct_timexpd = 0; |
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tsk->acct_rss_mem1 = 0; |
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tsk->acct_vm_mem1 = 0; |
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} |
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#endif
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