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x86, numa, 32-bit: increase max_elements to 1024 

so every element will represent 64M instead of 256M.

AMD opteron could have HW memory hole remapping, so could have
[0, 8g + 64M) on node0. Reduce element size to 64M to keep that on node 0

Later we need to use find_e820_area() to allocate memory_node_map like
on 64-bit. But need to move memory_present out of populate_mem_map...

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-05-31 22:51:51 -07:00 committed by Ingo Molnar
parent 4c1cbafb88
commit ba924c81dd
2 changed files with 9 additions and 9 deletions
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14
arch/x86/mm/discontig_32.c
View File

@ -59,14 +59,14 @@ unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
/*
* 4) physnode_map - the mapping between a pfn and owning node
* physnode_map keeps track of the physical memory layout of a generic
* numa node on a 256Mb break (each element of the array will
* represent 256Mb of memory and will be marked by the node id. so,
* numa node on a 64Mb break (each element of the array will
* represent 64Mb of memory and will be marked by the node id. so,
* if the first gig is on node 0, and the second gig is on node 1
* physnode_map will contain:
*
* physnode_map[0-3] = 0;
* physnode_map[4-7] = 1;
* physnode_map[8- ] = -1;
* physnode_map[0-15] = 0;
* physnode_map[16-31] = 1;
* physnode_map[32- ] = -1;
*/
s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
EXPORT_SYMBOL(physnode_map);
@ -81,9 +81,9 @@ void memory_present(int nid, unsigned long start, unsigned long end)
printk(KERN_DEBUG " ");
for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
printk("%ld ", pfn);
printk(KERN_CONT "%ld ", pfn);
}
printk("\n");
printk(KERN_CONT "\n");
}
unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,

4
include/asm-x86/mmzone_32.h
View File

@ -51,14 +51,14 @@ extern int early_pfn_to_nid(unsigned long pfn);
/*
* generic node memory support, the following assumptions apply:
*
* 1) memory comes in 256Mb contigious chunks which are either present or not
* 1) memory comes in 64Mb contigious chunks which are either present or not
* 2) we will not have more than 64Gb in total
*
* for now assume that 64Gb is max amount of RAM for whole system
* 64Gb / 4096bytes/page = 16777216 pages
*/
#define MAX_NR_PAGES 16777216
#define MAX_ELEMENTS 256
#define MAX_ELEMENTS 1024
#define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
extern s8 physnode_map[];