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Subject[patch 05/13] io-accounting: read accounting
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From: Andrew Morton <akpm@osdl.org>

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

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