aboutsummaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
Diffstat (limited to 'arch')
-rw-r--r--arch/x86_64/mm/srat.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index 33340bd1e328..79e3e98bbf10 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -25,6 +25,10 @@ static nodemask_t nodes_found __initdata;
static struct node nodes[MAX_NUMNODES] __initdata;
static __u8 pxm2node[256] = { [0 ... 255] = 0xff };
+/* Too small nodes confuse the VM badly. Usually they result
+ from BIOS bugs. */
+#define NODE_MIN_SIZE (4*1024*1024)
+
static int node_to_pxm(int n);
int pxm_to_node(int pxm)
@@ -168,22 +172,32 @@ acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
nd->start, nd->end);
}
+static void unparse_node(int node)
+{
+ int i;
+ node_clear(node, nodes_parsed);
+ for (i = 0; i < MAX_LOCAL_APIC; i++) {
+ if (apicid_to_node[i] == node)
+ apicid_to_node[i] = NUMA_NO_NODE;
+ }
+}
+
void __init acpi_numa_arch_fixup(void) {}
/* Use the information discovered above to actually set up the nodes. */
int __init acpi_scan_nodes(unsigned long start, unsigned long end)
{
int i;
+
+ for (i = 0; i < MAX_NUMNODES; i++) {
+ cutoff_node(i, start, end);
+ if ((nodes[i].end - nodes[i].start) < NODE_MIN_SIZE)
+ unparse_node(i);
+ }
+
if (acpi_numa <= 0)
return -1;
- /* First clean up the node list */
- for_each_node_mask(i, nodes_parsed) {
- cutoff_node(i, start, end);
- if (nodes[i].start == nodes[i].end)
- node_clear(i, nodes_parsed);
- }
-
memnode_shift = compute_hash_shift(nodes, nodes_weight(nodes_parsed));
if (memnode_shift < 0) {
printk(KERN_ERR