tree 4b0b9c10622aead0d8b658cca6c49090149a91a8
parent c723fdab8aa728dc2bf0da6a0de8bb9c3f588d84
author Tejun Heo <tj@kernel.org> 1295962010 +0100
committer Tejun Heo <tj@kernel.org> 1295962010 +0100

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>