[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>
diff --git a/include/asm-x86_64/numa.h b/include/asm-x86_64/numa.h
index bcf55c3..d51e56f 100644
--- a/include/asm-x86_64/numa.h
+++ b/include/asm-x86_64/numa.h
@@ -17,6 +17,8 @@
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 bbf89aa..8733ccf 100644
--- a/include/asm-x86_64/pda.h
+++ b/include/asm-x86_64/pda.h
@@ -15,6 +15,7 @@
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 1c603cd..d39ebd5 100644
--- a/include/asm-x86_64/topology.h
+++ b/include/asm-x86_64/topology.h
@@ -28,6 +28,8 @@
#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, \
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 57fc99c..f3cffc3 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -435,7 +435,9 @@
#include <linux/topology.h>
/* Returns the number of the current Node. */
+#ifndef numa_node_id
#define numa_node_id() (cpu_to_node(raw_smp_processor_id()))
+#endif
#ifndef CONFIG_NEED_MULTIPLE_NODES
