From: NeilBrown <neilb@suse.de>
Date: Mon, 25 May 2009 23:41:17 +0000 (+1000)
Subject: md: bitmap: improve bitmap maintenance code.
X-Git-Tag: v2.6.30-rc8~58^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be512691036cc989c11d0f418187efbbf14468e6;p=pandora-kernel.git

md: bitmap: improve bitmap maintenance code.

The code for checking which bits in the bitmap can be cleared
has 2 problems:
 1/ it repeatedly takes and drops a spinlock, where it would make
    more sense to just hold on to it most of the time.
 2/ it doesn't make use of some opportunities to skip large sections
    of the bitmap

This patch fixes those.  It will only affect CPU consumption, not
correctness.

Signed-off-by: NeilBrown <neilb@suse.de>
---

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