On Mon, Dec 27, 2010 at 02:37:19PM +0100, Tejun Heo wrote:

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 <redacted>
---
Shaohua, can you please verify this achieves the same result?  If no
one objects, I'll route it through the percpu tree.

Applied to percpu#for-2.6.39.

Thanks.

-- 
tejun