tree 332265cb9fe8b1e107864cdb380bf5f6b4bfb840
parent 2ecb9e633c5057d1203a59ef3e5c3aaea37c402e
author Eric Dumazet <dada1@cosmosbay.com> 1143199090 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1143214406 -0800

[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>