[PATCH] x86_64: Speed up numa_node_id by putting it directly into the PDA

Not go from the CPU number to an mapping array.
Mode number is often used now in fast paths.

This also adds a generic numa_node_id to all the topology includes

Suggested by Eric Dumazet

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 9 insertions, 3 deletions

diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
index 18e86e2eac2d..4bf64583ba3b 100644
--- a/arch/x86_64/mm/numa.c
+++ b/arch/x86_64/mm/numa.c
@@ -156,7 +156,7 @@ void __init numa_init_array(void)
         for (i = 0; i < NR_CPUS; i++) {
                 if (cpu_to_node[i] != NUMA_NO_NODE)
                         continue;
-                cpu_to_node[i] = rr;
+                numa_set_node(i, rr);
                 rr = next_node(rr, node_online_map);
                 if (rr == MAX_NUMNODES)
                         rr = first_node(node_online_map);
@@ -242,7 +242,7 @@ void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
         nodes_clear(node_online_map);
         node_set_online(0);
         for (i = 0; i < NR_CPUS; i++)
-                cpu_to_node[i] = 0;
+                numa_set_node(i, 0);
         node_to_cpumask[0] = cpumask_of_cpu(0);
         setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
 }
@@ -252,6 +252,12 @@ __cpuinit void numa_add_cpu(int cpu)
         set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
 } 
 
+void __cpuinit numa_set_node(int cpu, int node)
+{
+        cpu_pda[cpu].nodenumber = node;
+        cpu_to_node[cpu] = node;
+}
+
 unsigned long __init numa_free_all_bootmem(void) 
 { 
         int i;
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index 4b2e844c15a7..c7aa08a58041 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -203,7 +203,7 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
                 if (cpu_to_node[i] == NUMA_NO_NODE)
                         continue;
                 if (!node_isset(cpu_to_node[i], nodes_parsed))
-                        cpu_to_node[i] = NUMA_NO_NODE; 
+                        numa_set_node(i, NUMA_NO_NODE);
         }
         numa_init_array();
         return 0;