From: Justin TerAvest <teravest@google.com>
Date: Tue, 1 Mar 2011 20:05:08 +0000 (-0500)
Subject: cfq-iosched: Always provide group isolation.
X-Git-Tag: v2.6.39-rc1~80^2~49
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0bbfeb8320421989d3e12bd95fae86b9ac0712aa;p=pandora-kernel.git

cfq-iosched: Always provide group isolation.

Effectively, make group_isolation=1 the default and remove the tunable.
The setting group_isolation=0 was because by default we idle on
sync-noidle tree and on fast devices, this can be very harmful for
throughput.

However, this problem can also be addressed by tuning slice_idle and
possibly group_idle on faster storage devices.

This change simplifies the CFQ code by removing the feature entirely.

Signed-off-by: Justin TerAvest <teravest@google.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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