From: Jiri Olsa <jolsa@redhat.com>
Date: Tue, 12 Jan 2010 14:10:24 -0500
Subject: [misc] taskstats: upgrade to version 4
Message-id: <1263305427-17138-2-git-send-email-jolsa@redhat.com>
Patchwork-id: 22432
O-Subject: [PATCH v2 RHEL5.6 1/4] BZ 516961 taskstats - upgrade to version 4
Bugzilla: 516961
RH-Acked-by: Jerome Marchand <jmarchan@redhat.com>
RH-Acked-by: Anton Arapov <Anton@redhat.com>

This change will upgrade taskstats to version 4,
it is final diff of following patches:

taskstat version 4
    commit 7e40f2ab0a7e36706ee78b78b3792f08f208cd44
    Author: Balbir Singh <balbir@in.ibm.com>
    Date:   Mon Apr 23 14:41:05 2007 -0700
    Taskstats fix the structure members alignment issue

taskstat version 3
    commit 4a7864ca638e0a38307962ee8ef122822a351b65
    Author: Andrew Morton <akpm@osdl.org>
    Date:   Sun Dec 10 02:19:53 2006 -0800
    [PATCH] io-accounting: via taskstats

taskstat version 2
    commit db5fed26b2e0beed939b773dd5896077a1794d65
    Author: Jay Lan <jlan@sgi.com>
    Date:   Sat Sep 30 23:29:00 2006 -0700
    [PATCH] csa accounting taskstats update

taskstat version 2
    commit 8f0ab5147951267134612570604cf8341901a80c
    Author: Jay Lan <jlan@engr.sgi.com>
    Date:   Sat Sep 30 23:28:59 2006 -0700
    [PATCH] csa: convert CONFIG tag for extended accounting routines

taskstat version 2
    commit 9acc1853519a0473620d424105f9d49ea5b4e62e
    Author: Jay Lan <jlan@engr.sgi.com>
    Date:   Sat Sep 30 23:28:58 2006 -0700
    [PATCH] csa: Extended system accounting over taskstats

taskstat version 2
    commit f3cef7a99469afc159fec3a61b42dc7ca5b6824f
    Author: Jay Lan <jlan@engr.sgi.com>
    Date:   Sat Sep 30 23:28:55 2006 -0700
    [PATCH] csa: basic accounting over taskstats

wbr,
jirka

diff --git a/Documentation/accounting/taskstats-struct.txt b/Documentation/accounting/taskstats-struct.txt
new file mode 100644
index 0000000..661c797
--- /dev/null
+++ b/Documentation/accounting/taskstats-struct.txt
@@ -0,0 +1,161 @@
+The struct taskstats
+--------------------
+
+This document contains an explanation of the struct taskstats fields.
+
+There are three different groups of fields in the struct taskstats:
+
+1) Common and basic accounting fields
+    If CONFIG_TASKSTATS is set, the taskstats inteface is enabled and
+    the common fields and basic accounting fields are collected for
+    delivery at do_exit() of a task.
+2) Delay accounting fields
+    These fields are placed between
+    /* Delay accounting fields start */
+    and
+    /* Delay accounting fields end */
+    Their values are collected if CONFIG_TASK_DELAY_ACCT is set.
+3) Extended accounting fields
+    These fields are placed between
+    /* Extended accounting fields start */
+    and
+    /* Extended accounting fields end */
+    Their values are collected if CONFIG_TASK_XACCT is set.
+
+Future extension should add fields to the end of the taskstats struct, and
+should not change the relative position of each field within the struct.
+
+
+struct taskstats {
+
+1) Common and basic accounting fields:
+	/* The version number of this struct. This field is always set to
+	 * TAKSTATS_VERSION, which is defined in <linux/taskstats.h>.
+	 * Each time the struct is changed, the value should be incremented.
+	 */
+	__u16	version;
+
+  	/* The exit code of a task. */
+	__u32	ac_exitcode;		/* Exit status */
+
+  	/* The accounting flags of a task as defined in <linux/acct.h>
+	 * Defined values are AFORK, ASU, ACOMPAT, ACORE, and AXSIG.
+	 */
+	__u8	ac_flag;		/* Record flags */
+
+  	/* The value of task_nice() of a task. */
+	__u8	ac_nice;		/* task_nice */
+
+  	/* The name of the command that started this task. */
+	char	ac_comm[TS_COMM_LEN];	/* Command name */
+
+  	/* The scheduling discipline as set in task->policy field. */
+	__u8	ac_sched;		/* Scheduling discipline */
+
+	__u8	ac_pad[3];
+	__u32	ac_uid;			/* User ID */
+	__u32	ac_gid;			/* Group ID */
+	__u32	ac_pid;			/* Process ID */
+	__u32	ac_ppid;		/* Parent process ID */
+
+  	/* The time when a task begins, in [secs] since 1970. */
+	__u32	ac_btime;		/* Begin time [sec since 1970] */
+
+  	/* The elapsed time of a task, in [usec]. */
+	__u64	ac_etime;		/* Elapsed time [usec] */
+
+  	/* The user CPU time of a task, in [usec]. */
+	__u64	ac_utime;		/* User CPU time [usec] */
+
+  	/* The system CPU time of a task, in [usec]. */
+	__u64	ac_stime;		/* System CPU time [usec] */
+
+  	/* The minor page fault count of a task, as set in task->min_flt. */
+	__u64	ac_minflt;		/* Minor Page Fault Count */
+
+	/* The major page fault count of a task, as set in task->maj_flt. */
+	__u64	ac_majflt;		/* Major Page Fault Count */
+
+
+2) Delay accounting fields:
+	/* Delay accounting fields start
+	 *
+	 * All values, until the comment "Delay accounting fields end" are
+	 * available only if delay accounting is enabled, even though the last
+	 * few fields are not delays
+	 *
+	 * xxx_count is the number of delay values recorded
+	 * xxx_delay_total is the corresponding cumulative delay in nanoseconds
+	 *
+	 * xxx_delay_total wraps around to zero on overflow
+	 * xxx_count incremented regardless of overflow
+	 */
+
+	/* Delay waiting for cpu, while runnable
+	 * count, delay_total NOT updated atomically
+	 */
+	__u64	cpu_count;
+	__u64	cpu_delay_total;
+
+	/* Following four fields atomically updated using task->delays->lock */
+
+	/* Delay waiting for synchronous block I/O to complete
+	 * does not account for delays in I/O submission
+	 */
+	__u64	blkio_count;
+	__u64	blkio_delay_total;
+
+	/* Delay waiting for page fault I/O (swap in only) */
+	__u64	swapin_count;
+	__u64	swapin_delay_total;
+
+	/* cpu "wall-clock" running time
+	 * On some architectures, value will adjust for cpu time stolen
+	 * from the kernel in involuntary waits due to virtualization.
+	 * Value is cumulative, in nanoseconds, without a corresponding count
+	 * and wraps around to zero silently on overflow
+	 */
+	__u64	cpu_run_real_total;
+
+	/* cpu "virtual" running time
+	 * Uses time intervals seen by the kernel i.e. no adjustment
+	 * for kernel's involuntary waits due to virtualization.
+	 * Value is cumulative, in nanoseconds, without a corresponding count
+	 * and wraps around to zero silently on overflow
+	 */
+	__u64	cpu_run_virtual_total;
+	/* Delay accounting fields end */
+	/* version 1 ends here */
+
+
+3) Extended accounting fields
+	/* Extended accounting fields start */
+
+	/* Accumulated RSS usage in duration of a task, in MBytes-usecs.
+	 * The current rss usage is added to this counter every time
+	 * a tick is charged to a task's system time. So, at the end we
+	 * will have memory usage multiplied by system time. Thus an
+	 * average usage per system time unit can be calculated.
+	 */
+	__u64	coremem;		/* accumulated RSS usage in MB-usec */
+
+  	/* Accumulated virtual memory usage in duration of a task.
+	 * Same as acct_rss_mem1 above except that we keep track of VM usage.
+	 */
+	__u64	virtmem;		/* accumulated VM usage in MB-usec */
+
+  	/* High watermark of RSS usage in duration of a task, in KBytes. */
+	__u64	hiwater_rss;		/* High-watermark of RSS usage */
+
+  	/* High watermark of VM  usage in duration of a task, in KBytes. */
+	__u64	hiwater_vm;		/* High-water virtual memory usage */
+
+	/* The following four fields are I/O statistics of a task. */
+	__u64	read_char;		/* bytes read */
+	__u64	write_char;		/* bytes written */
+	__u64	read_syscalls;		/* read syscalls */
+	__u64	write_syscalls;		/* write syscalls */
+
+	/* Extended accounting fields end */
+
+}
diff --git a/fs/compat.c b/fs/compat.c
index f6ad1db..c77b194 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -44,7 +44,7 @@
 #include <linux/nfsd/syscall.h>
 #include <linux/personality.h>
 #include <linux/rwsem.h>
-#include <linux/acct.h>
+#include <linux/tsacct_kern.h>
 #include <linux/mm.h>
 
 #include <net/sock.h>		/* siocdevprivate_ioctl */
diff --git a/fs/exec.c b/fs/exec.c
index ac81e99..ba52ccb 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -47,7 +47,7 @@
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/rmap.h>
-#include <linux/acct.h>
+#include <linux/tsacct_kern.h>
 #include <linux/cn_proc.h>
 #include <linux/audit.h>
 #include <trace/signal.h>
diff --git a/include/linux/acct.h b/include/linux/acct.h
index e86bae7..0496d1f 100644
--- a/include/linux/acct.h
+++ b/include/linux/acct.h
@@ -124,16 +124,12 @@ extern void acct_auto_close(struct super_block *sb);
 extern void acct_init_pacct(struct pacct_struct *pacct);
 extern void acct_collect(long exitcode, int group_dead);
 extern void acct_process(void);
-extern void acct_update_integrals(struct task_struct *tsk);
-extern void acct_clear_integrals(struct task_struct *tsk);
 #else
 #define acct_auto_close_mnt(x)	do { } while (0)
 #define acct_auto_close(x)	do { } while (0)
 #define acct_init_pacct(x)	do { } while (0)
 #define acct_collect(x,y)	do { } while (0)
 #define acct_process()		do { } while (0)
-#define acct_update_integrals(x)		do { } while (0)
-#define acct_clear_integrals(task)	do { } while (0)
 #endif
 
 /*
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 559a5a7..683d1b1 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1078,10 +1078,10 @@ struct task_struct {
 	wait_queue_t *io_wait;
 /* i/o counters(bytes read/written, #syscalls */
 	u64 rchar, wchar, syscr, syscw;
-#if defined(CONFIG_BSD_PROCESS_ACCT)
+#if defined(CONFIG_TASK_XACCT)
 	u64 acct_rss_mem1;	/* accumulated rss usage */
 	u64 acct_vm_mem1;	/* accumulated virtual memory usage */
-	clock_t acct_stimexpd;	/* clock_t-converted stime since last update */
+	cputime_t acct_stimexpd;/* stime since last update */
 #endif
 #ifdef CONFIG_NUMA
   	struct mempolicy *mempolicy;
diff --git a/include/linux/taskstats.h b/include/linux/taskstats.h
index f1cb6cd..6825353 100644
--- a/include/linux/taskstats.h
+++ b/include/linux/taskstats.h
@@ -2,6 +2,7 @@
  *
  * Copyright (C) Shailabh Nagar, IBM Corp. 2006
  *           (C) Balbir Singh,   IBM Corp. 2006
+ *           (C) Jay Lan,        SGI, 2006
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2.1 of the GNU Lesser General Public License
@@ -29,16 +30,25 @@
  *	c) add new fields after version comment; maintain 64-bit alignment
  */
 
-#define TASKSTATS_VERSION	1
+
+#define TASKSTATS_VERSION	4
+#define TS_COMM_LEN		32	/* should be >= TASK_COMM_LEN
+					 * in linux/sched.h */
 
 struct taskstats {
 
-	/* Version 1 */
+	/* The version number of this struct. This field is always set to
+	 * TAKSTATS_VERSION, which is defined in <linux/taskstats.h>.
+	 * Each time the struct is changed, the value should be incremented.
+	 */
 	__u16	version;
-	__u16	padding[3];	/* Userspace should not interpret the padding
-				 * field which can be replaced by useful
-				 * fields if struct taskstats is extended.
-				 */
+	__u32	ac_exitcode;		/* Exit status */
+
+	/* The accounting flags of a task as defined in <linux/acct.h>
+	 * Defined values are AFORK, ASU, ACOMPAT, ACORE, and AXSIG.
+	 */
+	__u8	ac_flag;		/* Record flags */
+	__u8	ac_nice;		/* task_nice */
 
 	/* Delay accounting fields start
 	 *
@@ -56,7 +66,7 @@ struct taskstats {
 	/* Delay waiting for cpu, while runnable
 	 * count, delay_total NOT updated atomically
 	 */
-	__u64	cpu_count;
+	__u64	cpu_count __attribute__((aligned(8)));
 	__u64	cpu_delay_total;
 
 	/* Following four fields atomically updated using task->delays->lock */
@@ -88,6 +98,57 @@ struct taskstats {
 	__u64	cpu_run_virtual_total;
 	/* Delay accounting fields end */
 	/* version 1 ends here */
+
+	/* Basic Accounting Fields start */
+	char	ac_comm[TS_COMM_LEN];	/* Command name */
+	__u8	ac_sched __attribute__((aligned(8)));
+					/* Scheduling discipline */
+	__u8	ac_pad[3];
+	__u32	ac_uid __attribute__((aligned(8)));
+					/* User ID */
+	__u32	ac_gid;			/* Group ID */
+	__u32	ac_pid;			/* Process ID */
+	__u32	ac_ppid;		/* Parent process ID */
+	__u32	ac_btime;		/* Begin time [sec since 1970] */
+	__u64	ac_etime __attribute__((aligned(8)));
+					/* Elapsed time [usec] */
+	__u64	ac_utime;		/* User CPU time [usec] */
+	__u64	ac_stime;		/* SYstem CPU time [usec] */
+	__u64	ac_minflt;		/* Minor Page Fault Count */
+	__u64	ac_majflt;		/* Major Page Fault Count */
+	/* Basic Accounting Fields end */
+
+ 	/* Extended accounting fields start */
+	/* Accumulated RSS usage in duration of a task, in MBytes-usecs.
+	 * The current rss usage is added to this counter every time
+	 * a tick is charged to a task's system time. So, at the end we
+	 * will have memory usage multiplied by system time. Thus an
+	 * average usage per system time unit can be calculated.
+	 */
+ 	__u64	coremem;		/* accumulated RSS usage in MB-usec */
+	/* Accumulated virtual memory usage in duration of a task.
+	 * Same as acct_rss_mem1 above except that we keep track of VM usage.
+	 */
+ 	__u64	virtmem;		/* accumulated VM  usage in MB-usec */
+
+	/* High watermark of RSS and virtual memory usage in duration of
+	 * a task, in KBytes.
+	 */
+ 	__u64	hiwater_rss;		/* High-watermark of RSS usage, in KB */
+ 	__u64	hiwater_vm;		/* High-water VM usage, in KB */
+
+	/* The following four fields are I/O statistics of a task. */
+ 	__u64	read_char;		/* bytes read */
+ 	__u64	write_char;		/* bytes written */
+ 	__u64	read_syscalls;		/* read syscalls */
+ 	__u64	write_syscalls;		/* write syscalls */
+ 	/* Extended accounting fields end */
+
+#define TASKSTATS_HAS_IO_ACCOUNTING
+	/* Per-task storage I/O accounting starts */
+	__u64   read_bytes;             /* bytes of read I/O */
+	__u64   write_bytes;            /* bytes of write I/O */
+	__u64   cancelled_write_bytes;  /* bytes of cancelled write I/O */
 };
 
 
diff --git a/include/linux/tsacct_kern.h b/include/linux/tsacct_kern.h
new file mode 100644
index 0000000..7e50ac7
--- /dev/null
+++ b/include/linux/tsacct_kern.h
@@ -0,0 +1,34 @@
+/*
+ * tsacct_kern.h - kernel header for system accounting over taskstats interface
+ *
+ * Copyright (C) Jay Lan	SGI
+ */
+
+#ifndef _LINUX_TSACCT_KERN_H
+#define _LINUX_TSACCT_KERN_H
+
+#include <linux/taskstats.h>
+
+#ifdef CONFIG_TASKSTATS
+extern void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk);
+#else
+static inline void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
+{}
+#endif /* CONFIG_TASKSTATS */
+
+#ifdef CONFIG_TASK_XACCT
+extern void xacct_add_tsk(struct taskstats *stats, struct task_struct *p);
+extern void acct_update_integrals(struct task_struct *tsk);
+extern void acct_clear_integrals(struct task_struct *tsk);
+#else
+static inline void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
+{}
+static inline void acct_update_integrals(struct task_struct *tsk)
+{}
+static inline void acct_clear_integrals(struct task_struct *tsk)
+{}
+#endif /* CONFIG_TASK_XACCT */
+
+#endif
+
+
diff --git a/init/Kconfig b/init/Kconfig
index fbab124..9c55975 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -281,6 +281,15 @@ config UID16
 	help
 	  This enables the legacy 16-bit UID syscall wrappers.
 
+config TASK_XACCT
+	bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
+	depends on TASKSTATS
+	help
+	  Collect extended task accounting data and send the data
+	  to userland for processing over the taskstats interface.
+
+	  Say N if unsure.
+
 config SYSCTL
 	bool "Sysctl support" if EMBEDDED
 	default y
diff --git a/kernel/Makefile b/kernel/Makefile
index 0172581..6ae194a 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -50,7 +50,7 @@ obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
 obj-$(CONFIG_RELAY) += relay.o
 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
-obj-$(CONFIG_TASKSTATS) += taskstats.o
+obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
 obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
 obj-$(CONFIG_UTRACE) += utrace.o
 obj-$(CONFIG_PTRACE) += ptrace.o
diff --git a/kernel/acct.c b/kernel/acct.c
index f4330ac..0aad5ca 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -602,33 +602,3 @@ void acct_process(void)
 	do_acct_process(file);
 	fput(file);
 }
-
-
-/**
- * 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)) {
-		long delta =
-			cputime_to_jiffies(tsk->stime) - tsk->acct_stimexpd;
-
-		if (delta == 0)
-			return;
-		tsk->acct_stimexpd = tsk->stime;
-		tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
-		tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
-	}
-}
-
-/**
- * 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_stimexpd = 0;
-	tsk->acct_rss_mem1 = 0;
-	tsk->acct_vm_mem1 = 0;
-}
diff --git a/kernel/exit.c b/kernel/exit.c
index a292420..a68d910 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -18,6 +18,7 @@
 #include <linux/security.h>
 #include <linux/cpu.h>
 #include <linux/acct.h>
+#include <linux/tsacct_kern.h>
 #include <linux/file.h>
 #include <linux/binfmts.h>
 #include <linux/tracehook.h>
diff --git a/kernel/fork.c b/kernel/fork.c
index 95bb523..63ec9a4 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -44,6 +44,7 @@
 #include <linux/profile.h>
 #include <linux/rmap.h>
 #include <linux/acct.h>
+#include <linux/tsacct_kern.h>
 #include <linux/cn_proc.h>
 #include <linux/delayacct.h>
 #include <linux/taskstats_kern.h>
diff --git a/kernel/sched.c b/kernel/sched.c
index 950e1df..d49ddab 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -49,7 +49,7 @@
 #include <linux/seq_file.h>
 #include <linux/syscalls.h>
 #include <linux/times.h>
-#include <linux/acct.h>
+#include <linux/tsacct_kern.h>
 #include <linux/kprobes.h>
 #include <linux/delayacct.h>
 #include <linux/hash.h>
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index ba23583..305865b 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -18,7 +18,9 @@
 
 #include <linux/kernel.h>
 #include <linux/taskstats_kern.h>
+#include <linux/tsacct_kern.h>
 #include <linux/delayacct.h>
+#include <linux/tsacct_kern.h>
 #include <linux/cpumask.h>
 #include <linux/percpu.h>
 #include <net/genetlink.h>
@@ -198,7 +200,13 @@ static int fill_pid(pid_t pid, struct task_struct *pidtsk,
 	 */
 
 	delayacct_add_tsk(stats, tsk);
+
+	/* fill in basic acct fields */
 	stats->version = TASKSTATS_VERSION;
+	bacct_add_tsk(stats, tsk);
+
+	/* fill in extended acct fields */
+	xacct_add_tsk(stats, tsk);
 
 	/* Define err: label here if needed */
 	put_task_struct(tsk);
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
new file mode 100644
index 0000000..120194e
--- /dev/null
+++ b/kernel/tsacct.c
@@ -0,0 +1,133 @@
+/*
+ * 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>
+
+
+#define USEC_PER_TICK	(USEC_PER_SEC/HZ)
+/*
+ * fill in basic accounting fields
+ */
+void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
+{
+	struct timespec uptime, ts;
+	s64 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, current->group_leader->start_time);
+	/* rebase elapsed time to usec */
+	ac_etime = timespec_to_ns(&ts);
+	do_div(ac_etime, NSEC_PER_USEC);
+	stats->ac_etime = ac_etime;
+	stats->ac_btime = xtime.tv_sec - 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_uid	 = tsk->uid;
+	stats->ac_gid	 = tsk->gid;
+	stats->ac_pid	 = tsk->pid;
+	stats->ac_ppid	 = (tsk->parent) ? tsk->parent->pid : 0;
+	stats->ac_utime	 = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;
+	stats->ac_stime	 = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;
+	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)
+{
+	/* convert pages-jiffies to Mbyte-usec */
+	stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;
+	stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;
+	if (p->mm) {
+		/* adjust to KB unit */
+		stats->hiwater_rss   = p->mm->hiwater_rss * PAGE_SIZE / KB;
+		stats->hiwater_vm    = p->mm->hiwater_vm * PAGE_SIZE / KB;
+	}
+	stats->read_char	= p->rchar;
+	stats->write_char	= p->wchar;
+	stats->read_syscalls	= p->syscr;
+	stats->write_syscalls	= p->syscw;
+#ifdef CONFIG_TASK_IO_ACCOUNTING
+	stats->read_bytes	= task_aux(p)->ioac.read_bytes;
+	stats->write_bytes	= task_aux(p)->ioac.write_bytes;
+	stats->cancelled_write_bytes = task_aux(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)) {
+		long delta = cputime_to_jiffies(
+			cputime_sub(tsk->stime, tsk->acct_stimexpd));
+
+		if (delta == 0)
+			return;
+		tsk->acct_stimexpd = tsk->stime;
+		tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
+		tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
+	}
+}
+
+/**
+ * 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_stimexpd = 0;
+	tsk->acct_rss_mem1 = 0;
+	tsk->acct_vm_mem1 = 0;
+}
+#endif