From: Peter Zijlstra <peterz@infradead.org>
Date: Mon, 24 Nov 2008 16:06:57 +0000 (+0100)
Subject: itimers: remove the per-cpu-ish-ness
X-Git-Tag: v2.6.29-rc3~41^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=490dea45d00f01847ebebd007685d564aaf2cd98;p=pandora-kernel.git

itimers: remove the per-cpu-ish-ness

Either we bounce once cacheline per cpu per tick, yielding n^2 bounces
or we just bounce a single..

Also, using per-cpu allocations for the thread-groups complicates the
per-cpu allocator in that its currently aimed to be a fixed sized
allocator and the only possible extention to that would be vmap based,
which is seriously constrained on 32 bit archs.

So making the per-cpu memory requirement depend on the number of
processes is an issue.

Lastly, it didn't deal with cpu-hotplug, although admittedly that might
be fixable.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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