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| author | Jens Axboe <axboe@suse.de> | 2006-05-23 11:23:49 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-05-23 10:39:43 -0700 |
| commit | fd0ff8aa1d95a896b3627bc62d42d6d002ac0bc3 (patch) | |
| tree | e4ba36d57ca288eeaebdc882b988833e86607b22 | |
| parent | 0f0410823792ae0ecb45f2578598b115835ffdbb (diff) | |
| download | lwn-fd0ff8aa1d95a896b3627bc62d42d6d002ac0bc3.tar.gz lwn-fd0ff8aa1d95a896b3627bc62d42d6d002ac0bc3.zip | |
[PATCH] blk: fix gendisk->in_flight accounting during barrier sequence
While executing barrrier sequence, the bar_rq which carries actual
write was accounted as normal IO on completion, while it wasn't on
queueing. This caused gendisk->in_flight to be decremented by 1 after
each barrier thus messed up statistics.
This patch makes bar_rq not accounted as normal IO. As the containing
barrier request as a whole is accounted, part of it shouldn't be.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | block/ll_rw_blk.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index eac48bec1479..7eb36c53f4b7 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -3452,7 +3452,12 @@ void end_that_request_last(struct request *req, int uptodate) if (unlikely(laptop_mode) && blk_fs_request(req)) laptop_io_completion(); - if (disk && blk_fs_request(req)) { + /* + * Account IO completion. bar_rq isn't accounted as a normal + * IO on queueing nor completion. Accounting the containing + * request is enough. + */ + if (disk && blk_fs_request(req) && req != &req->q->bar_rq) { unsigned long duration = jiffies - req->start_time; const int rw = rq_data_dir(req); |