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authorMike Travis <travis@sgi.com>2008-05-12 21:21:12 +0200
committerIngo Molnar <mingo@elte.hu>2008-07-08 11:31:24 +0200
commit9f248bde9d47cc177011198c9a15fb339b9f3215 (patch)
treea6bb5bff1d8d786370b061eeb0958b413b941d41 /arch/x86
parent7891a24e1ee50c96896c0cf7da216a8e7b573ca5 (diff)
x86: remove the static 256k node_to_cpumask_map
* Consolidate node_to_cpumask operations and remove the 256k byte node_to_cpumask_map. This is done by allocating the node_to_cpumask_map array after the number of possible nodes (nr_node_ids) is known. * Debug printouts when CONFIG_DEBUG_PER_CPU_MAPS is active have been increased. It now shows faults when calling node_to_cpumask() and node_to_cpumask_ptr(). For inclusion into sched-devel/latest tree. Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + sched-devel/latest .../mingo/linux-2.6-sched-devel.git Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/setup.c132
-rw-r--r--arch/x86/mm/numa_64.c6
2 files changed, 127 insertions, 11 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 0dff17ee3d7..913af838c3c 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -35,6 +35,16 @@ EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
/* map cpu index to node index */
DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
+
+/* which logical CPUs are on which nodes */
+cpumask_t *node_to_cpumask_map;
+EXPORT_SYMBOL(node_to_cpumask_map);
+
+/* setup node_to_cpumask_map */
+static void __init setup_node_to_cpumask_map(void);
+
+#else
+static inline void setup_node_to_cpumask_map(void) { }
#endif
#if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_X86_SMP)
@@ -140,11 +150,15 @@ void __init setup_per_cpu_areas(void)
}
nr_cpu_ids = highest_cpu + 1;
- printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids);
+ printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n",
+ NR_CPUS, nr_cpu_ids, nr_node_ids);
/* Setup percpu data maps */
setup_per_cpu_maps();
+ /* Setup node to cpumask map */
+ setup_node_to_cpumask_map();
+
/* Setup cpumask_of_cpu map */
setup_cpumask_of_cpu();
}
@@ -152,6 +166,35 @@ void __init setup_per_cpu_areas(void)
#endif
#ifdef X86_64_NUMA
+
+/*
+ * Allocate node_to_cpumask_map based on number of available nodes
+ * Requires node_possible_map to be valid.
+ *
+ * Note: node_to_cpumask() is not valid until after this is done.
+ */
+static void __init setup_node_to_cpumask_map(void)
+{
+ unsigned int node, num = 0;
+ cpumask_t *map;
+
+ /* setup nr_node_ids if not done yet */
+ if (nr_node_ids == MAX_NUMNODES) {
+ for_each_node_mask(node, node_possible_map)
+ num = node;
+ nr_node_ids = num + 1;
+ }
+
+ /* allocate the map */
+ map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
+
+ Dprintk(KERN_DEBUG "Node to cpumask map at %p for %d nodes\n",
+ map, nr_node_ids);
+
+ /* node_to_cpumask() will now work */
+ node_to_cpumask_map = map;
+}
+
void __cpuinit numa_set_node(int cpu, int node)
{
int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
@@ -174,6 +217,8 @@ void __cpuinit numa_clear_node(int cpu)
numa_set_node(cpu, NUMA_NO_NODE);
}
+#ifndef CONFIG_DEBUG_PER_CPU_MAPS
+
void __cpuinit numa_add_cpu(int cpu)
{
cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
@@ -183,9 +228,44 @@ void __cpuinit numa_remove_cpu(int cpu)
{
cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]);
}
-#endif /* CONFIG_NUMA */
-#if defined(CONFIG_DEBUG_PER_CPU_MAPS) && defined(CONFIG_X86_64)
+#else /* CONFIG_DEBUG_PER_CPU_MAPS */
+
+/*
+ * --------- debug versions of the numa functions ---------
+ */
+static void __cpuinit numa_set_cpumask(int cpu, int enable)
+{
+ int node = cpu_to_node(cpu);
+ cpumask_t *mask;
+ char buf[64];
+
+ if (node_to_cpumask_map == NULL) {
+ printk(KERN_ERR "node_to_cpumask_map NULL\n");
+ dump_stack();
+ return;
+ }
+
+ mask = &node_to_cpumask_map[node];
+ if (enable)
+ cpu_set(cpu, *mask);
+ else
+ cpu_clear(cpu, *mask);
+
+ cpulist_scnprintf(buf, sizeof(buf), *mask);
+ printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
+ enable? "numa_add_cpu":"numa_remove_cpu", cpu, node, buf);
+ }
+
+void __cpuinit numa_add_cpu(int cpu)
+{
+ numa_set_cpumask(cpu, 1);
+}
+
+void __cpuinit numa_remove_cpu(int cpu)
+{
+ numa_set_cpumask(cpu, 0);
+}
int cpu_to_node(int cpu)
{
@@ -199,6 +279,10 @@ int cpu_to_node(int cpu)
}
EXPORT_SYMBOL(cpu_to_node);
+/*
+ * Same function as cpu_to_node() but used if called before the
+ * per_cpu areas are setup.
+ */
int early_cpu_to_node(int cpu)
{
if (early_per_cpu_ptr(x86_cpu_to_node_map))
@@ -207,9 +291,47 @@ int early_cpu_to_node(int cpu)
if (!per_cpu_offset(cpu)) {
printk(KERN_WARNING
"early_cpu_to_node(%d): no per_cpu area!\n", cpu);
- dump_stack();
+ dump_stack();
return NUMA_NO_NODE;
}
return per_cpu(x86_cpu_to_node_map, cpu);
}
-#endif
+
+/*
+ * Returns a pointer to the bitmask of CPUs on Node 'node'.
+ */
+cpumask_t *_node_to_cpumask_ptr(int node)
+{
+ if (node_to_cpumask_map == NULL) {
+ printk(KERN_WARNING
+ "_node_to_cpumask_ptr(%d): no node_to_cpumask_map!\n",
+ node);
+ dump_stack();
+ return &cpu_online_map;
+ }
+ return &node_to_cpumask_map[node];
+}
+EXPORT_SYMBOL(_node_to_cpumask_ptr);
+
+/*
+ * Returns a bitmask of CPUs on Node 'node'.
+ */
+cpumask_t node_to_cpumask(int node)
+{
+ if (node_to_cpumask_map == NULL) {
+ printk(KERN_WARNING
+ "node_to_cpumask(%d): no node_to_cpumask_map!\n", node);
+ dump_stack();
+ return cpu_online_map;
+ }
+ return node_to_cpumask_map[node];
+}
+EXPORT_SYMBOL(node_to_cpumask);
+
+/*
+ * --------- end of debug versions of the numa functions ---------
+ */
+
+#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
+
+#endif /* X86_64_NUMA */
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 970f86775c4..14c7ab417ec 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -35,9 +35,6 @@ s16 apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
};
-cpumask_t node_to_cpumask_map[MAX_NUMNODES] __read_mostly;
-EXPORT_SYMBOL(node_to_cpumask_map);
-
int numa_off __initdata;
unsigned long __initdata nodemap_addr;
unsigned long __initdata nodemap_size;
@@ -560,9 +557,6 @@ void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
node_set(0, node_possible_map);
for (i = 0; i < NR_CPUS; i++)
numa_set_node(i, 0);
- /* cpumask_of_cpu() may not be available during early startup */
- memset(&node_to_cpumask_map[0], 0, sizeof(node_to_cpumask_map[0]));
- cpu_set(0, node_to_cpumask_map[0]);
e820_register_active_regions(0, start_pfn, end_pfn);
setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
}