From 6f5d8aa6382eef2b26032c88656270bdae7f0c42 Mon Sep 17 00:00:00 2001
From: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Date: Tue, 30 Oct 2007 10:40:13 +0100
Subject: [PATCH] Deadline iosched: Fix batching fairness

After switching data directions, deadline always starts the next batch
from the lowest-sector request.  This gives excessive deadline expiries
and large latency and throughput disparity between high- and low-sector
requests; an order of magnitude in some tests.

This patch changes the batching behaviour so new batches start from the
request whose expiry is earliest.

Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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