From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 26 Apr 2007 10:53:50 +0000 (+0200)
Subject: [PATCH] cfq-iosched: speed up rbtree handling
X-Git-Tag: v2.6.22-rc1~1108^2^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cc09e2990fdd96d25fdbb9db6bc9b4c82d9e4a3c;p=pandora-kernel.git

[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>
---

Reading git-diff-tree failed