From dcf36bfa5de6d4e37878d4c98b6986fee4eb8b4c Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sat, 25 Mar 2006 16:31:46 +0100 Subject: [PATCH] x86_64: group memnodemap and memnodeshift in a memnode structure pfn_to_page() and others need to access both memnode_shift and the very first bytes of memnodemap[]. If we force memnode_shift to be just before the memnodemap array, we can reduce the memory footprint to one cache line instead of two for most setups. This patch introduce a 'memnode' structure where shift and map[] are carefully placed. Signed-off-by: Eric Dumazet Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-x86_64/mmzone.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'include/asm-x86_64/mmzone.h') diff --git a/include/asm-x86_64/mmzone.h b/include/asm-x86_64/mmzone.h index 972c9359f7d7..937f99b26883 100644 --- a/include/asm-x86_64/mmzone.h +++ b/include/asm-x86_64/mmzone.h @@ -15,8 +15,13 @@ #define NODEMAPSIZE 0xfff /* Simple perfect hash to map physical addresses to node numbers */ -extern int memnode_shift; -extern u8 memnodemap[NODEMAPSIZE]; +struct memnode { + int shift; + u8 map[NODEMAPSIZE]; +} ____cacheline_aligned; +extern struct memnode memnode; +#define memnode_shift memnode.shift +#define memnodemap memnode.map extern struct pglist_data *node_data[]; -- cgit v1.2.3