// 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 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