From: Frederik Deweerdt <frederik.deweerdt@xprog.eu>
Date: Mon, 12 Jan 2009 21:35:42 +0000 (+0100)
Subject: x86, tlb flush_data: replace per_cpu with an array
X-Git-Tag: v2.6.30-rc1~2^2~50^2~60^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=09b3ec7315a18d885127544204f1e389d41058d0;p=pandora-kernel.git

x86, tlb flush_data: replace per_cpu with an array

Impact: micro-optimization, memory reduction

On x86_64 flush tlb data is stored in per_cpu variables. This is
unnecessary because only the first NUM_INVALIDATE_TLB_VECTORS entries
are accessed.

This patch aims at making the code less confusing (there's nothing
really "per_cpu") by using a plain array. It also would save some memory
on most distros out there (Ubuntu x86_64 has NR_CPUS=64 by default).

[ Ravikiran G Thirumalai also pointed out that the correct alignment
  is ____cacheline_internodealigned_in_smp, so that there's no
  bouncing on vsmp. ]

Signed-off-by: Frederik Deweerdt <frederik.deweerdt@xprog.eu>
Acked-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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