diff options
Diffstat (limited to 'kernel/tsacct.c')
| -rw-r--r-- | kernel/tsacct.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/kernel/tsacct.c b/kernel/tsacct.c new file mode 100644 index 000000000..4252f0645 --- /dev/null +++ b/kernel/tsacct.c @@ -0,0 +1,182 @@ +// 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); + 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 * 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 |