From: Konstantin Khlebnikov <khlebnikov@openvz.org>
Date: Thu, 20 May 2010 19:21:34 +0000 (+0400)
Subject: cfq-iosched: remove dead_key from cfq_io_context
X-Git-Tag: v2.6.35-rc2~12^2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bca4b914b5da3d8e7b9b647f620b71dc85c0c394;p=pandora-kernel.git

cfq-iosched: remove dead_key from cfq_io_context

Remove ->dead_key field from cfq_io_context to shrink its size to 128 bytes.
(64 bytes for 32-bit hosts)

Use lower bit in ->key as dead-mark, instead of moving key to separate field.
After this for dead cfq_io_context we got cic->key != cfqd automatically.
Thus, io_context's last-hit cache should work without changing.

Now to check ->key for non-dead state compare it with cfqd,
instead of checking ->key for non-null value as it was before.

Plus remove obsolete race protection in cfq_cic_lookup.
This race gone after v2.6.24-1728-g4ac845a

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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