[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>

3 files changed, 5 insertions, 0 deletions

diff --git a/include/asm-x86_64/numa.h b/include/asm-x86_64/numa.h
index bcf55c3f7f7f..d51e56fdc3da 100644
--- a/include/asm-x86_64/numa.h
+++ b/include/asm-x86_64/numa.h
@@ -17,6 +17,8 @@ extern void numa_add_cpu(int cpu);
 extern void numa_init_array(void);
 extern int numa_off;
 
+extern void numa_set_node(int cpu, int node);
+
 extern unsigned char apicid_to_node[256];
 
 #define NUMA_NO_NODE 0xff
diff --git a/include/asm-x86_64/pda.h b/include/asm-x86_64/pda.h
index bbf89aa8a1af..8733ccfa442e 100644
--- a/include/asm-x86_64/pda.h
+++ b/include/asm-x86_64/pda.h
@@ -15,6 +15,7 @@ struct x8664_pda {
         int irqcount;               /* Irq nesting counter. Starts with -1 */   
         int cpunumber;              /* Logical CPU number */
         char *irqstackptr;      /* top of irqstack */
+        int nodenumber;             /* number of current node */
         unsigned int __softirq_pending;
         unsigned int __nmi_count;       /* number of NMI on this CPUs */
         struct mm_struct *active_mm;
diff --git a/include/asm-x86_64/topology.h b/include/asm-x86_64/topology.h
index 1c603cd7e4d0..d39ebd5263ed 100644
--- a/include/asm-x86_64/topology.h
+++ b/include/asm-x86_64/topology.h
@@ -28,6 +28,8 @@ extern int __node_distance(int, int);
 #define pcibus_to_node(bus)             ((long)(bus->sysdata))  
 #define pcibus_to_cpumask(bus)          node_to_cpumask(pcibus_to_node(bus));
 
+#define numa_node_id()                  read_pda(nodenumber)
+
 /* sched_domains SD_NODE_INIT for x86_64 machines */
 #define SD_NODE_INIT (struct sched_domain) {            \
         .span                   = CPU_MASK_NONE,        \