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as-iosched: fix write batch start point

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New write batches currently start from where the last one completed.
We have no idea where the head is after switching batches, so this
makes little sense.  Instead, start the next batch from the request
with the earliest deadline in the hope that we avoid a deadline
expiry later on.

Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Aaron Carroll 2007-12-05 21:07:07 +11:00 committed by Jens Axboe
parent 8896f3c039
commit 49565124b1
1 changed files with 2 additions and 1 deletions
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block/as-iosched.c
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@ -1097,7 +1097,8 @@ static int as_dispatch_request(struct request_queue *q, int force)
ad->batch_data_dir = REQ_ASYNC;
ad->current_write_count = ad->write_batch_count;
ad->write_batch_idled = 0;
rq = ad->next_rq[ad->batch_data_dir];
rq = rq_entry_fifo(ad->fifo_list[REQ_ASYNC].next);
ad->last_check_fifo[REQ_ASYNC] = jiffies;
goto dispatch_request;
}