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authorJack Steiner <steiner@sgi.com>2005-12-05 14:56:50 -0500
committerTony Luck <tony.luck@intel.com>2005-12-06 12:10:37 -0500
commitacb7f67280128a9ddaa756ff10212391d28caec4 (patch)
tree2c475d61a7842cf1849a109c5ad5c189f4053aee /arch/ia64/mm/discontig.c
parent3ec829b6895092b0686254c315f42642b4a07efc (diff)
[IA64] Limit the maximum NODEDATA_ALIGN() offset
The per-node data structures are allocated with strided offsets that are a function of the node number. This prevents excessive cache-aliasing from occurring. On systems with a large number of nodes, the strided offset becomes too large. This patch restricts the maximum offset to 32MB. This is far larger than the size of any current L3 cache. Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/mm/discontig.c')
-rw-r--r--arch/ia64/mm/discontig.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 0f776b032d31..c87d6d1d5813 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -50,8 +50,10 @@ static nodemask_t memory_less_mask __initdata;
50 * To prevent cache aliasing effects, align per-node structures so that they 50 * To prevent cache aliasing effects, align per-node structures so that they
51 * start at addresses that are strided by node number. 51 * start at addresses that are strided by node number.
52 */ 52 */
53#define MAX_NODE_ALIGN_OFFSET (32 * 1024 * 1024)
53#define NODEDATA_ALIGN(addr, node) \ 54#define NODEDATA_ALIGN(addr, node) \
54 ((((addr) + 1024*1024-1) & ~(1024*1024-1)) + (node)*PERCPU_PAGE_SIZE) 55 ((((addr) + 1024*1024-1) & ~(1024*1024-1)) + \
56 (((node)*PERCPU_PAGE_SIZE) & (MAX_NODE_ALIGN_OFFSET - 1)))
55 57
56/** 58/**
57 * build_node_maps - callback to setup bootmem structs for each node 59 * build_node_maps - callback to setup bootmem structs for each node