From: Eric Dumazet <dada1@cosmosbay.com>
Date: Fri, 24 Mar 2006 11:18:10 +0000 (-0800)
Subject: [PATCH] HOTPLUG_CPU: avoid hitting too many cachelines in recalc_bh_state()
X-Git-Tag: v2.6.17-rc1~904
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a14342683b1e3adcf5f78660a42fcbd95b44a35;p=pandora-kernel.git

[PATCH] HOTPLUG_CPU: avoid hitting too many cachelines in recalc_bh_state()

Instead of using for_each_cpu(i), we can use for_each_online_cpu(i).

When a CPU goes offline (ie removed from online map), it might have a non
null bh_accounting.nr, so this patch adds a transfer of this counter to an
online CPU counter.

We already have a hotcpu_notifier, (function buffer_cpu_notify()), where we
can do this bh_accounting.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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