From 8e2967555571659d2c8a70dd120710110ed7bba4 Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Sat, 3 Oct 2009 16:26:03 +0200
Subject: [PATCH] cfq-iosched: implement slower async initiate and queue ramp
 up

This slowly ramps up the async queue depth based on the time
passed since the sync IO, and doesn't allow async at all until
a sync slice period has passed.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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