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[PATCH] x86_64: group memnodemap and memnodeshift in a memnode structure

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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>
This commit is contained in:
Eric Dumazet 2006-03-25 16:31:46 +01:00 committed by Linus Torvalds
parent 40caa88465
commit dcf36bfa5d
2 changed files with 9 additions and 6 deletions
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6
arch/x86_64/mm/numa.c
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@ -25,8 +25,7 @@
struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
bootmem_data_t plat_node_bdata[MAX_NUMNODES];
int memnode_shift;
u8 memnodemap[NODEMAPSIZE];
struct memnode memnode;
unsigned char cpu_to_node[NR_CPUS] __read_mostly = {
[0 ... NR_CPUS-1] = NUMA_NO_NODE
@ -367,8 +366,7 @@ void __init init_cpu_to_node(void)
EXPORT_SYMBOL(cpu_to_node);
EXPORT_SYMBOL(node_to_cpumask);
EXPORT_SYMBOL(memnode_shift);
EXPORT_SYMBOL(memnodemap);
EXPORT_SYMBOL(memnode);
EXPORT_SYMBOL(node_data);
#ifdef CONFIG_DISCONTIGMEM

9
include/asm-x86_64/mmzone.h
View file

@ -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[];