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| author | Eric Dumazet <dada1@cosmosbay.com> | 2006-03-25 16:31:46 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-25 09:14:38 -0800 |
| commit | dcf36bfa5de6d4e37878d4c98b6986fee4eb8b4c (patch) | |
| tree | 6b18d3efd64e55f14209f40ee3232da2ea25d69e /include/asm-x86_64 | |
| parent | 40caa884650fc6931cf55918dbf7496c49b3ddf8 (diff) | |
| download | op-kernel-dev-dcf36bfa5de6d4e37878d4c98b6986fee4eb8b4c.zip op-kernel-dev-dcf36bfa5de6d4e37878d4c98b6986fee4eb8b4c.tar.gz | |
[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 <dada1@cosmosbay.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64')
| -rw-r--r-- | include/asm-x86_64/mmzone.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/include/asm-x86_64/mmzone.h b/include/asm-x86_64/mmzone.h index 972c935..937f99b 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[]; |
