/* * 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 taskstats *stats, struct task_struct *tsk){	const struct cred *tcred;	struct timespec uptime, ts;	u64 ac_etime; 	BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); 	/* calculate task elapsed time in timespec */	do_posix_clock_monotonic_gettime(&uptime);	ts = timespec_sub(uptime, tsk->start_time);	/* rebase elapsed time to usec (should never be negative) */	ac_etime = timespec_to_ns(&ts);	do_div(ac_etime, NSEC_PER_USEC);	stats->ac_etime = ac_etime;	stats->ac_btime = get_seconds() - ts.tv_sec;	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	 = tsk->pid;	rcu_read_lock();	tcred = __task_cred(tsk);	stats->ac_uid	 = tcred->uid;	stats->ac_gid	 = tcred->gid;	stats->ac_ppid	 = pid_alive(tsk) ?				rcu_dereference(tsk->real_parent)->tgid : 0;	rcu_read_unlock();	stats->ac_utime = cputime_to_usecs(tsk->utime);	stats->ac_stime = cputime_to_usecs(tsk->stime);	stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled);	stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled);	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)/* * fill in extended accounting fields */void xacct_add_tsk(struct taskstats *stats, struct task_struct *p){	struct mm_struct *mm; 	/* convert pages-usec to Mbyte-usec */	stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;	stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;	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;	stats->write_char	= p->ioac.wchar;	stats->read_syscalls	= p->ioac.syscr;	stats->write_syscalls	= p->ioac.syscw;#ifdef CONFIG_TASK_IO_ACCOUNTING	stats->read_bytes	= p->ioac.read_bytes;	stats->write_bytes	= p->ioac.write_bytes;	stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;#else	stats->read_bytes	= 0;	stats->write_bytes	= 0;	stats->cancelled_write_bytes = 0;#endif}#undef KB#undef MB /** * acct_update_integrals - update mm integral fields in task_struct * @tsk: task_struct for accounting */void acct_update_integrals(struct task_struct *tsk){	if (likely(tsk->mm)) {		cputime_t time, dtime;		struct timeval value;		unsigned long flags;		u64 delta; 		local_irq_save(flags);		time = tsk->stime + tsk->utime;		dtime = cputime_sub(time, tsk->acct_timexpd);		jiffies_to_timeval(cputime_to_jiffies(dtime), &value);		delta = value.tv_sec;		delta = delta * USEC_PER_SEC + value.tv_usec; 		if (delta == 0)			goto out;		tsk->acct_timexpd = time;		tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);		tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;	out:		local_irq_restore(flags);	}} /** * 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