From: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Date: Thu, 14 Aug 2008 08:17:13 +0000 (+1000)
Subject: deadline-iosched: allow non-sequential batching
X-Git-Tag: v2.6.28-rc1~733^2~114
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=63de428b139d3d31d86ebe25ae97b33f6540fb7e;p=pandora-kernel.git

deadline-iosched: allow non-sequential batching

Deadline currently only batches sector-contiguous requests, so except
for a few circumstances (e.g. requests in a single direction), it is
essentially first come first served.  This is bad for throughput, so
change it to CSCAN, which means requests in a batch do not need to be
sequential and are issued in increasing sector order.

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