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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182// SPDX-License-Identifier: GPL-2.0-or-later/* * tsacct.c - System accounting over taskstats interface * * Copyright (C) Jay Lan, <jlan@sgi.com> */
#include <linux/kernel.h>#include <linux/sched/signal.h>#include <linux/sched/mm.h>#include <linux/sched/cputime.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 now_ns, delta; time64_t btime;
BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
/* calculate task elapsed time in nsec */ now_ns = ktime_get_ns(); /* store whole group time first */ delta = now_ns - tsk->group_leader->start_time; /* Convert to micro seconds */ do_div(delta, NSEC_PER_USEC); stats->ac_tgetime = delta; delta = now_ns - tsk->start_time; do_div(delta, NSEC_PER_USEC); stats->ac_etime = delta; /* Convert to seconds for btime (note y2106 limit) */ btime = ktime_get_real_seconds() - div_u64(delta, USEC_PER_SEC); stats->ac_btime = clamp_t(time64_t, btime, 0, U32_MAX); stats->ac_btime64 = btime;
if (tsk->flags & PF_EXITING) stats->ac_exitcode = tsk->exit_code; if (thread_group_leader(tsk) && (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); stats->ac_tgid = task_tgid_nr_ns(tsk, pid_ns); stats->ac_ppid = task_ppid_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); 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;
strscpy_pad(stats->ac_comm, tsk->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 (unlikely(!tsk->mm || (tsk->flags & PF_KTHREAD))) 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 * READ_ONCE(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