From: Jay Lan <jlan@engr.sgi.com>

Add extended system accounting handling over taskstats interface.  A
CONFIG_TASK_XACCT flag is created to enable the extended accounting code.

Signed-off-by: Jay Lan <jlan@sgi.com>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jes Sorensen <jes@sgi.com>
Cc: Chris Sturtivant <csturtiv@sgi.com>
Cc: Tony Ernst <tee@sgi.com>
Cc: Guillaume Thouvenin <guillaume.thouvenin@bull.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 include/linux/taskstats.h   |   11 +++++++++++
 include/linux/tsacct_kern.h |    9 +++++++++
 init/Kconfig                |    9 +++++++++
 kernel/taskstats.c          |    4 ++++
 kernel/tsacct.c             |   19 +++++++++++++++++++
 5 files changed, 52 insertions(+)

diff -puN include/linux/taskstats.h~csa-extended-system-accounting-over-taskstats include/linux/taskstats.h
--- a/include/linux/taskstats.h~csa-extended-system-accounting-over-taskstats
+++ a/include/linux/taskstats.h
@@ -107,6 +107,17 @@ struct taskstats {
 	__u64	ac_minflt;		/* Minor Page Fault */
 	__u64	ac_majflt;		/* Major Page Fault */
 	/* Basic Accounting Fields end */
+
+ 	/* Extended accounting fields start */
+ 	__u64	acct_rss_mem1;		/* accumulated rss usage */
+ 	__u64	acct_vm_mem1;		/* accumulated virtual memory usage */
+ 	__u64	hiwater_rss;		/* High-watermark of RSS usage */
+ 	__u64	hiwater_vm;		/* High-water virtual memory usage */
+ 	__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 -puN include/linux/tsacct_kern.h~csa-extended-system-accounting-over-taskstats include/linux/tsacct_kern.h
--- a/include/linux/tsacct_kern.h~csa-extended-system-accounting-over-taskstats
+++ a/include/linux/tsacct_kern.h
@@ -16,4 +16,13 @@ static inline void bacct_add_tsk(struct 
 {}
 #endif /* CONFIG_TASKSTATS */
 
+#ifdef CONFIG_TASK_XACCT
+extern void xacct_add_tsk(struct taskstats *stats, struct task_struct *p);
+#else
+static inline void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
+{}
+#endif /* CONFIG_TASK_XACCT */
+
 #endif
+
+
diff -puN init/Kconfig~csa-extended-system-accounting-over-taskstats init/Kconfig
--- a/init/Kconfig~csa-extended-system-accounting-over-taskstats
+++ a/init/Kconfig
@@ -182,6 +182,15 @@ config TASK_DELAY_ACCT
 
 	  Say N if unsure.
 
+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
 
diff -puN kernel/taskstats.c~csa-extended-system-accounting-over-taskstats kernel/taskstats.c
--- a/kernel/taskstats.c~csa-extended-system-accounting-over-taskstats
+++ a/kernel/taskstats.c
@@ -20,6 +20,7 @@
 #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>
@@ -204,6 +205,9 @@ static int fill_pid(pid_t pid, struct ta
 	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);
 	return rc;
diff -puN kernel/tsacct.c~csa-extended-system-accounting-over-taskstats kernel/tsacct.c
--- a/kernel/tsacct.c~csa-extended-system-accounting-over-taskstats
+++ a/kernel/tsacct.c
@@ -70,3 +70,22 @@ void bacct_add_tsk(struct taskstats *sta
 	strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
 }
 
+
+#ifdef CONFIG_TASK_XACCT
+/*
+ * fill in extended accounting fields
+ */
+void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
+{
+	stats->acct_rss_mem1 = p->acct_rss_mem1;
+	stats->acct_vm_mem1  = p->acct_vm_mem1;
+	if (p->mm) {
+		stats->hiwater_rss   = p->mm->hiwater_rss;
+		stats->hiwater_vm    = p->mm->hiwater_vm;
+	}
+	stats->read_char	= p->rchar;
+	stats->write_char	= p->wchar;
+	stats->read_syscalls	= p->syscr;
+	stats->write_syscalls	= p->syscw;
+}
+#endif
_