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authormalahal@us.ibm.com <malahal@us.ibm.com>2008-10-30 07:51:58 (GMT)
committerJens Axboe <jens.axboe@oracle.com>2008-12-29 07:28:42 (GMT)
commit565e411d764eeda006738dfadbccca79d48381e1 (patch)
tree5bd835b9aed2df0dc91ed58740834d6e156e86ea /block/blk-timeout.c
parent66d352e1e410dcea22fecb9fa9ec09dd23a62e1c (diff)
block: optimizations in blk_rq_timed_out_timer()
Now the rq->deadline can't be zero if the request is in the timeout_list, so there is no need to have next_set. There is no need to access a request's deadline field if blk_rq_timed_out is called on it. Signed-off-by: Malahal Naineni <malahal@us.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-timeout.c')
-rw-r--r--block/blk-timeout.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/block/blk-timeout.c b/block/blk-timeout.c
index 69185ea..116bbf3 100644
--- a/block/blk-timeout.c
+++ b/block/blk-timeout.c
@@ -111,7 +111,7 @@ static void blk_rq_timed_out(struct request *req)
void blk_rq_timed_out_timer(unsigned long data)
{
struct request_queue *q = (struct request_queue *) data;
- unsigned long flags, uninitialized_var(next), next_set = 0;
+ unsigned long flags, next = 0;
struct request *rq, *tmp;
spin_lock_irqsave(q->queue_lock, flags);
@@ -126,12 +126,10 @@ void blk_rq_timed_out_timer(unsigned long data)
if (blk_mark_rq_complete(rq))
continue;
blk_rq_timed_out(rq);
+ } else {
+ if (!next || time_after(next, rq->deadline))
+ next = rq->deadline;
}
- if (!next_set) {
- next = rq->deadline;
- next_set = 1;
- } else if (time_after(next, rq->deadline))
- next = rq->deadline;
}
if (next_set && !list_empty(&q->timeout_list))

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