From ba924c81dd5a7a7fb5ded025af7fdd3b61f8ca67 Mon Sep 17 00:00:00 2001
From: Yinghai Lu <yhlu.kernel@gmail.com>
Date: Sat, 31 May 2008 22:51:51 -0700
Subject: [PATCH] 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>
---
arch/x86/mm/discontig_32.c | 14 +++++++-------
include/asm-x86/mmzone_32.h | 4 ++--
2 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/arch/x86/mm/discontig_32.c b/arch/x86/mm/discontig_32.c
index 55fdbab6b014..922af20d1d29 100644
--- a/arch/x86/mm/discontig_32.c
+++ b/arch/x86/mm/discontig_32.c
@@ -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,
diff --git a/include/asm-x86/mmzone_32.h b/include/asm-x86/mmzone_32.h
index faef751181b7..ab0012888c44 100644
--- a/include/asm-x86/mmzone_32.h
+++ b/include/asm-x86/mmzone_32.h
@@ -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[];
--
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