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| author | Eric Dumazet <dada1@cosmosbay.com> | 2006-03-25 15:31:46 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-25 17:14:38 (GMT) |
| commit | dcf36bfa5de6d4e37878d4c98b6986fee4eb8b4c (patch) | |
| tree | 6b18d3efd64e55f14209f40ee3232da2ea25d69e | |
| parent | 40caa884650fc6931cf55918dbf7496c49b3ddf8 (diff) | |
| download | linux-dcf36bfa5de6d4e37878d4c98b6986fee4eb8b4c.tar.xz | |
[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>
| -rw-r--r-- | arch/x86_64/mm/numa.c | 6 | ||||
| -rw-r--r-- | include/asm-x86_64/mmzone.h | 9 |
2 files changed, 9 insertions, 6 deletions
diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c index 07471a3..63c7264 100644 --- a/arch/x86_64/mm/numa.c +++ b/arch/x86_64/mm/numa.c @@ -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 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[]; |