commit cc09e2990fdd96d25fdbb9db6bc9b4c82d9e4a3c
author Jens Axboe <jens.axboe@oracle.com> Thu Apr 26 12:53:50 2007 +0200
committer Jens Axboe <axboe@nelson.home.kernel.dk> Mon Apr 30 09:01:21 2007 +0200
tree 89c538c6182335592a981ded03fc120b616aef47
parent d9e7620e60bc6648c3dcabbc8d1a320b69c846f9

[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>