From cc09e2990fdd96d25fdbb9db6bc9b4c82d9e4a3c Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 26 Apr 2007 12:53:50 +0200
Subject: [PATCH] [PATCH] cfq-iosched: speed up rbtree handling

For cases where the rbtree is mainly used for sorting and min retrieval,
a nice speedup of the rbtree code is to maintain a cache of the leftmost
node in the tree.

Also spotted in the CFS CPU scheduler code.

Improved by Alan D. Brunelle <Alan.Brunelle@hp.com> by updating the
leftmost hint in cfq_rb_first() if it isn't set, instead of only
updating it on insert.

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