[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>
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@ -25,8 +25,7 @@
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struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
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bootmem_data_t plat_node_bdata[MAX_NUMNODES];
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int memnode_shift;
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u8 memnodemap[NODEMAPSIZE];
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struct memnode memnode;
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unsigned char cpu_to_node[NR_CPUS] __read_mostly = {
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[0 ... NR_CPUS-1] = NUMA_NO_NODE
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@ -367,8 +366,7 @@ void __init init_cpu_to_node(void)
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EXPORT_SYMBOL(cpu_to_node);
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EXPORT_SYMBOL(node_to_cpumask);
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EXPORT_SYMBOL(memnode_shift);
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EXPORT_SYMBOL(memnodemap);
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EXPORT_SYMBOL(memnode);
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EXPORT_SYMBOL(node_data);
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#ifdef CONFIG_DISCONTIGMEM
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@ -15,8 +15,13 @@
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#define NODEMAPSIZE 0xfff
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/* Simple perfect hash to map physical addresses to node numbers */
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extern int memnode_shift;
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extern u8 memnodemap[NODEMAPSIZE];
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struct memnode {
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int shift;
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u8 map[NODEMAPSIZE];
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} ____cacheline_aligned;
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extern struct memnode memnode;
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#define memnode_shift memnode.shift
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#define memnodemap memnode.map
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extern struct pglist_data *node_data[];
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