Index: linux-2.6.28/include/linux/acct.h
===================================================================
--- linux-2.6.28.orig/include/linux/acct.h	2009-01-14 13:02:24.000000000 +0100
+++ linux-2.6.28/include/linux/acct.h	2009-01-14 13:03:33.000000000 +0100
@@ -97,6 +97,54 @@
 	char		ac_comm[ACCT_COMM];	/* Command Name */
 };
 
+struct acct_atop
+{
+	char		ac_flag;		/* Flags */
+	char		ac_version;		/* Always set to ACCT_VERSION */
+	__u32		ac_pid;			/* Process ID */
+	__u32		ac_ppid;		/* Parent Process ID */
+	__u16		ac_uid16;		/* LSB of Real User ID */
+	__u16		ac_gid16;		/* LSB of Real Group ID */
+	__u16		ac_tty;			/* Control Terminal */
+	__u32		ac_btime;		/* Process Creation Time */
+	comp_t		ac_utime;		/* User Time */
+	comp_t		ac_stime;		/* System Time */
+	comp_t		ac_etime;		/* Elapsed Time */
+	comp_t		ac_mem;			/* Virtual  Memory */
+	comp_t		ac_rss;			/* Resident Memory */
+	comp_t		ac_io;			/* Chars Transferred */
+	comp_t		ac_rw;			/* Blocks Read or Written */
+	comp_t		ac_bread;		/* Blocks Read */
+	comp_t		ac_bwrite;		/* Blocks Written */
+	comp2_t		ac_dskrsz;		/* Cum. blocks read */
+	comp2_t		ac_dskwsz;		/* Cum. blocks written */
+	comp_t		ac_tcpsnd;		/* TCP send requests */
+	comp_t		ac_tcprcv;		/* TCP recv requests */
+	comp2_t		ac_tcpssz;		/* TCP cum. length   */
+	comp2_t		ac_tcprsz;		/* TCP cum. length   */
+	comp_t		ac_udpsnd;		/* UDP send requests */
+	comp_t		ac_udprcv;		/* UDP recv requests */
+	comp2_t		ac_udpssz;		/* UDP cum. length   */
+	comp2_t		ac_udprsz;		/* UDP cum. length   */
+	comp_t		ac_rawsnd;		/* RAW send requests */
+	comp_t		ac_rawrcv;		/* RAW recv requests */
+	comp_t		ac_minflt;		/* Minor Pagefaults */
+	comp_t		ac_majflt;		/* Major Pagefaults */
+	comp_t		ac_swaps;		/* Number of Swaps */
+/* m68k had no padding here. */
+#if !defined(CONFIG_M68K) || !defined(__KERNEL__)
+	__u16		ac_ahz;			/* AHZ */
+#endif
+	__u32		ac_exitcode;		/* Exitcode */
+	char		ac_comm[ACCT_COMM + 1];	/* Command Name */
+	__u8		ac_etime_hi;		/* Elapsed Time MSB */
+	__u16		ac_etime_lo;		/* Elapsed Time LSB */
+	__u32		ac_uid;			/* Real User ID */
+	__u32		ac_gid;			/* Real Group ID */
+};
+
+
+
 /*
  *  accounting flags
  */
@@ -146,7 +194,13 @@
  * 5: new binary incompatible format (128 bytes, second half)
  *
  */
+#define CONFIG_PROCESS_ACCT_ATOP
 
+#ifdef CONFIG_PROCESS_ACCT_ATOP
+#define ACCT_VERSION	6
+#define AHZ		(USER_HZ)
+typedef struct acct_atop acct_t;
+#else
 #ifdef CONFIG_BSD_PROCESS_ACCT_V3
 #define ACCT_VERSION	3
 #define AHZ		100
@@ -160,6 +214,7 @@
 #define AHZ		(USER_HZ)
 typedef struct acct acct_t;
 #endif
+#endif
 
 #else
 #define ACCT_VERSION	2
Index: linux-2.6.28/kernel/acct.c
===================================================================
--- linux-2.6.28.orig/kernel/acct.c	2009-01-14 13:03:31.000000000 +0100
+++ linux-2.6.28/kernel/acct.c	2009-01-14 13:03:33.000000000 +0100
@@ -405,7 +405,7 @@
 	return exp;
 }
 
-#if ACCT_VERSION==1 || ACCT_VERSION==2
+#if ACCT_VERSION==1 || ACCT_VERSION==2 || ACCT_VERSION==6
 /*
  * encode an u64 into a comp2_t (24 bits)
  *
@@ -552,6 +552,30 @@
 	ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns);
 	rcu_read_unlock();
 #endif
+#if ACCT_VERSION==6        /* ATOP */
+	ac.ac_pid    = current->pid;
+	ac.ac_ppid   = current->parent->pid;
+       ac.ac_uid16  = ac.ac_uid;
+       ac.ac_gid16  = ac.ac_gid;
+	ac.ac_ahz    = AHZ;
+	ac.ac_bread  = encode_comp_t(current->stat.dsk_rio);
+	ac.ac_bwrite = encode_comp_t(current->stat.dsk_wio);
+	ac.ac_dskrsz = encode_comp2_t(current->stat.dsk_rsz);
+	ac.ac_dskwsz = encode_comp2_t(current->stat.dsk_wsz);
+	ac.ac_tcpsnd = encode_comp_t(current->stat.tcp_snd);
+	ac.ac_tcprcv = encode_comp_t(current->stat.tcp_rcv);
+	ac.ac_tcpssz = encode_comp2_t(current->stat.tcp_ssz);
+	ac.ac_tcprsz = encode_comp2_t(current->stat.tcp_rsz);
+	ac.ac_udpsnd = encode_comp_t(current->stat.udp_snd);
+	ac.ac_udprcv = encode_comp_t(current->stat.udp_rcv);
+	ac.ac_udpssz = encode_comp2_t(current->stat.udp_ssz);
+	ac.ac_udprsz = encode_comp2_t(current->stat.udp_rsz);
+	ac.ac_rawsnd = encode_comp_t(current->stat.raw_snd);
+	ac.ac_rawrcv = encode_comp_t(current->stat.raw_rcv);
+	ac.ac_rss    = current->mm ?
+		encode_comp_t(get_mm_rss(current->mm)<<(PAGE_SHIFT-10)) :
+		encode_comp_t(0);
+#endif
 
 	spin_lock_irq(&current->sighand->siglock);
 	tty = current->signal->tty;	/* Safe as we hold the siglock */