linux-kernel - [patch 05/13] io-accounting: read accounting

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Date:	Fri, 08 Dec 2006 03:52:27 -0800
From:	akpm@...l.org
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...l.org, balbir@...ibm.com, csturtiv@....com, daw@....com,
	guillaume.thouvenin@...l.net, jlan@....com, nagar@...son.ibm.com,
	tee@....com
Subject: [patch 05/13] io-accounting: read accounting

From: Andrew Morton <akpm@...l.org>

Wire up read accounting for block devices, within submit_bio().

Cc: Jay Lan <jlan@....com>
Cc: Shailabh Nagar <nagar@...son.ibm.com>
Cc: Balbir Singh <balbir@...ibm.com>
Cc: Chris Sturtivant <csturtiv@....com>
Cc: Tony Ernst <tee@....com>
Cc: Guillaume Thouvenin <guillaume.thouvenin@...l.net>
Cc: David Wright <daw@....com>
Signed-off-by: Andrew Morton <akpm@...l.org>
---

 block/ll_rw_blk.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff -puN block/ll_rw_blk.c~io-accounting-read-accounting-2 block/ll_rw_blk.c
--- a/block/ll_rw_blk.c~io-accounting-read-accounting-2
+++ a/block/ll_rw_blk.c
@@ -25,6 +25,7 @@
 #include <linux/slab.h>
 #include <linux/swap.h>
 #include <linux/writeback.h>
+#include <linux/task_io_accounting_ops.h>
 #include <linux/interrupt.h>
 #include <linux/cpu.h>
 #include <linux/blktrace_api.h>
@@ -3235,10 +3236,12 @@ void submit_bio(int rw, struct bio *bio)
 	BIO_BUG_ON(!bio->bi_size);
 	BIO_BUG_ON(!bio->bi_io_vec);
 	bio->bi_rw |= rw;
-	if (rw & WRITE)
+	if (rw & WRITE) {
 		count_vm_events(PGPGOUT, count);
-	else
+	} else {
+		task_io_account_read(bio->bi_size);
 		count_vm_events(PGPGIN, count);
+	}
 
 	if (unlikely(block_dump)) {
 		char b[BDEVNAME_SIZE];
_
-
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