diff options
| author |   Tejun Heo <htejun@gmail.com> | 2005-11-10 08:52:05 +0100 |
|---|---|---|
| committer |   Jens Axboe <axboe@nelson.home.kernel.dk> | 2005-11-12 10:56:06 +0100 |
| commit | 15853af9f07673680439b224519c692f1352b959 (patch) | |
| tree | e6a8fc1cd34dec568883cd62102e1e626d9241d9 /include/linux | |
| parent | [BLOCK] cfq-iosched: cfq forced dispatching fix (diff) | |
| download | linux-dev-15853af9f07673680439b224519c692f1352b959.tar.xz linux-dev-15853af9f07673680439b224519c692f1352b959.zip | |
[BLOCK] Implement elv_drain_elevator for improved switch error detection
This patch adds request_queue->nr_sorted which keeps the number of
requests in the iosched and implement elv_drain_elevator which
performs forced dispatching. elv_drain_elevator checks whether
iosched actually dispatches all requests it has and prints error
message if it doesn't. As buggy forced dispatching can result in
wrong barrier operations, I think this extra check is worthwhile.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/blkdev.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 025a7f084dbd..a33a31e71bbc 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -406,6 +406,7 @@ struct request_queue atomic_t refcnt; + unsigned int nr_sorted; unsigned int in_flight; /* @@ -631,6 +632,7 @@ static inline void elv_dispatch_add_tail(struct request_queue *q, { if (q->last_merge == rq) q->last_merge = NULL; + q->nr_sorted--; q->end_sector = rq_end_sector(rq); q->boundary_rq = rq; |