From 25890454667b3295f67b3372352be90705f8667c Mon Sep 17 00:00:00 2001
From: Shailabh Nagar <nagar@watson.ibm.com>
Date: Fri, 14 Jul 2006 00:24:43 -0700
Subject: [PATCH] per-task-delay-accounting: /proc export of aggregated block
 I/O delays

Export I/O delays seen by a task through /proc/<tgid>/stats for use in top
etc.

Note that delays for I/O done for swapping in pages (swapin I/O) is clubbed
together with all other I/O here (this is not the case in the netlink
interface where the swapin I/O is kept distinct)

[akpm@osdl.org: printk warning fix]
Signed-off-by: Shailabh Nagar <nagar@watson.ibm.com>
Signed-off-by: Balbir Singh <balbir@in.ibm.com>
Cc: Jes Sorensen <jes@sgi.com>
Cc: Peter Chubb <peterc@gelato.unsw.edu.au>
Cc: Erich Focht <efocht@ess.nec.de>
Cc: Levent Serinol <lserinol@gmail.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 fs/proc/array.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'fs')

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 7495d3e2077..0b615d62a15 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -74,6 +74,7 @@
 #include <linux/times.h>
 #include <linux/cpuset.h>
 #include <linux/rcupdate.h>
+#include <linux/delayacct.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -411,7 +412,7 @@ static int do_task_stat(struct task_struct *task, char * buffer, int whole)
 
 	res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
-%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu\n",
+%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
 		task->pid,
 		tcomm,
 		state,
@@ -455,7 +456,8 @@ static int do_task_stat(struct task_struct *task, char * buffer, int whole)
 		task->exit_signal,
 		task_cpu(task),
 		task->rt_priority,
-		task->policy);
+		task->policy,
+		(unsigned long long)delayacct_blkio_ticks(task));
 	if(mm)
 		mmput(mm);
 	return res;
-- 
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