From: Tejun Heo <tj@kernel.org>
Date: Tue, 25 Jan 2011 13:26:50 +0000 (+0100)
Subject: percpu: align percpu readmostly subsection to cacheline
X-Git-Tag: v2.6.39-rc1~491^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=19df0c2fef010e94e90df514aaf4e73f6b80145c;p=pandora-kernel.git

percpu: align percpu readmostly subsection to cacheline

Currently percpu readmostly subsection may share cachelines with other
percpu subsections which may result in unnecessary cacheline bounce
and performance degradation.

This patch adds @cacheline parameter to PERCPU() and PERCPU_VADDR()
linker macros, makes each arch linker scripts specify its cacheline
size and use it to align percpu subsections.

This is based on Shaohua's x86 only patch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Shaohua Li <shaohua.li@intel.com>
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