From c0324a020e5b351f100569b128715985f1023af8 Mon Sep 17 00:00:00 2001
From: Corrado Zoccolo <czoccolo@gmail.com>
Date: Tue, 27 Oct 2009 19:16:03 +0100
Subject: [PATCH] cfq-iosched: reimplement priorities using different service
 trees

We use different service trees for different priority classes.
This allows a simplification in the service tree insertion code, that no
longer has to consider priority while walking the tree.

Signed-off-by: Corrado Zoccolo <czoccolo@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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