From 49565124b13bb16607e7f8fc8fb1d9c5c355a1a3 Mon Sep 17 00:00:00 2001 From: Aaron Carroll Date: Wed, 5 Dec 2007 21:07:07 +1100 Subject: [PATCH] as-iosched: fix write batch start point 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 Acked-by: Nick Piggin Signed-off-by: Jens Axboe --- block/as-iosched.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/as-iosched.c b/block/as-iosched.c index 4513fc5..555cd6b 100644 --- a/block/as-iosched.c +++ b/block/as-iosched.c @@ -1097,7 +1097,8 @@ dispatch_writes: 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; } -- 1.8.2.3