From 19df0c2fef010e94e90df514aaf4e73f6b80145c Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 25 Jan 2011 14:26:50 +0100 Subject: 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 Cc: Shaohua Li --- arch/alpha/kernel/vmlinux.lds.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/alpha/kernel') diff --git a/arch/alpha/kernel/vmlinux.lds.S b/arch/alpha/kernel/vmlinux.lds.S index 003ef4c02585..173518f8c8bb 100644 --- a/arch/alpha/kernel/vmlinux.lds.S +++ b/arch/alpha/kernel/vmlinux.lds.S @@ -38,7 +38,7 @@ SECTIONS __init_begin = ALIGN(PAGE_SIZE); INIT_TEXT_SECTION(PAGE_SIZE) INIT_DATA_SECTION(16) - PERCPU(PAGE_SIZE) + PERCPU(64, PAGE_SIZE) /* Align to THREAD_SIZE rather than PAGE_SIZE here so any padding page needed for the THREAD_SIZE aligned init_task gets freed after init */ . = ALIGN(THREAD_SIZE); -- cgit v1.2.3