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authorKiyoshi Ueda <k-ueda@ct.jp.nec.com>2009-05-27 16:50:02 +0400
committerJens Axboe <jens.axboe@oracle.com>2009-05-27 16:50:02 +0400
commit3c4198e874cde694f5ea1463706873e7907bdb18 (patch)
tree2315e8e86996c98ddfa74059dc61255317bef0eb /block
parentba396a6c104682dfe5c8b4fbbf5974d5ac9f3687 (diff)
downloadlinux-3c4198e874cde694f5ea1463706873e7907bdb18.tar.xz
block: fix no diskstat problem
The commit below in 2.6-block/for-2.6.31 causes no diskstat problem because the blk_discard_rq() check was added with '&&'. It should be 'blk_fs_request() || blk_discard_rq()'. This patch does it and fixes the no diskstat problem. Please review and apply. ------ /proc/diskstat without this patch ------------------------------------- 8 0 sda 0 0 0 0 0 0 0 0 0 0 0 ------------------------------------------------------------------------------ ----- /proc/diskstat with this patch applied --------------------------------- 8 0 sda 4186 303 373621 61600 9578 3859 107468 169479 2 89755 231059 ------------------------------------------------------------------------------ -------------------------------------------------------------------------- commit c69d48540c201394d08cb4d48b905e001313d9b8 Author: Jens Axboe <jens.axboe@oracle.com> Date: Fri Apr 24 08:12:19 2009 +0200 block: include discard requests in IO accounting We currently don't do merging on discard requests, but we potentially could. If we do, then we need to include discard requests in the IO accounting, or merging would end up decrementing in_flight IO counters for an IO which never incremented them. So enable accounting for discard requests. <snip> static inline int blk_do_io_stat(struct request *rq) { - return rq->rq_disk && blk_rq_io_stat(rq) && blk_fs_request(rq); + return rq->rq_disk && blk_rq_io_stat(rq) && blk_fs_request(rq) && + blk_discard_rq(rq); } -------------------------------------------------------------------------- Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/block/blk.h b/block/blk.h
index c863ec2281e0..3fae6add5430 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -156,12 +156,12 @@ static inline int blk_cpu_to_group(int cpu)
*
* a) it's attached to a gendisk, and
* b) the queue had IO stats enabled when this request was started, and
- * c) it's a file system request
+ * c) it's a file system request or a discard request
*/
static inline int blk_do_io_stat(struct request *rq)
{
- return rq->rq_disk && blk_rq_io_stat(rq) && blk_fs_request(rq) &&
- blk_discard_rq(rq);
+ return rq->rq_disk && blk_rq_io_stat(rq) &&
+ (blk_fs_request(rq) || blk_discard_rq(rq));
}
#endif