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cpumask: convert node_to_cpumask_map[] to cpumask_var_t

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Impact: reduce kernel memory usage when CONFIG_CPUMASK_OFFSTACK=y

Straightforward conversion: done for 32 and 64 bit kernels.
node_to_cpumask_map is now a cpumask_var_t array.

64-bit used to be a dynamic cpumask_t array, and 32-bit used to be a
static cpumask_t array.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2009-03-13 14:49:53 +10:30
parent 71ee73e722
commit c032ef60d1
4 changed files with 24 additions and 28 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
arch/x86/include/asm/topology.h
View file

@ -86,15 +86,15 @@ static inline int early_cpu_to_node(int cpu)
#endif /* CONFIG_X86_64 */
/* Mappings between node number and cpus on that node. */
extern cpumask_t *node_to_cpumask_map;
extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
extern const cpumask_t *cpumask_of_node(int node);
#else
/* Returns a pointer to the cpumask of CPUs on Node 'node'. */
static inline const cpumask_t *cpumask_of_node(int node)
static inline const struct cpumask *cpumask_of_node(int node)
{
return &node_to_cpumask_map[node];
return node_to_cpumask_map[node];
}
#endif

4
arch/x86/kernel/smpboot.c
View file

@ -123,7 +123,7 @@ EXPORT_SYMBOL(cpu_to_node_map);
static void map_cpu_to_node(int cpu, int node)
{
printk(KERN_INFO "Mapping cpu %d to node %d\n", cpu, node);
cpumask_set_cpu(cpu, &node_to_cpumask_map[node]);
cpumask_set_cpu(cpu, node_to_cpumask_map[node]);
cpu_to_node_map[cpu] = node;
}
@ -134,7 +134,7 @@ static void unmap_cpu_to_node(int cpu)
printk(KERN_INFO "Unmapping cpu %d from all nodes\n", cpu);
for (node = 0; node < MAX_NUMNODES; node++)
cpumask_clear_cpu(cpu, &node_to_cpumask_map[node]);
cpumask_clear_cpu(cpu, node_to_cpumask_map[node]);
cpu_to_node_map[cpu] = 0;
}
#else /* !(CONFIG_NUMA && CONFIG_X86_32) */

28
arch/x86/mm/numa.c
View file

@ -12,7 +12,7 @@
/*
* Which logical CPUs are on which nodes
*/
cpumask_t *node_to_cpumask_map;
cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
EXPORT_SYMBOL(node_to_cpumask_map);
/*
@ -25,7 +25,6 @@ EXPORT_SYMBOL(node_to_cpumask_map);
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) {
@ -35,14 +34,11 @@ void __init setup_node_to_cpumask_map(void)
}
/* allocate the map */
map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t));
DBG("node_to_cpumask_map at %p for %d nodes\n", map, nr_node_ids);
for (node = 0; node < nr_node_ids; node++)
alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
pr_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;
/* cpumask_of_node() will now work */
pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids);
}
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
@ -51,13 +47,6 @@ void __init setup_node_to_cpumask_map(void)
*/
const cpumask_t *cpumask_of_node(int node)
{
if (node_to_cpumask_map == NULL) {
printk(KERN_WARNING
"cpumask_of_node(%d): no node_to_cpumask_map!\n",
node);
dump_stack();
return cpu_online_mask;
}
if (node >= nr_node_ids) {
printk(KERN_WARNING
"cpumask_of_node(%d): node > nr_node_ids(%d)\n",
@ -65,6 +54,13 @@ const cpumask_t *cpumask_of_node(int node)
dump_stack();
return cpu_none_mask;
}
if (node_to_cpumask_map[node] == NULL) {
printk(KERN_WARNING
"cpumask_of_node(%d): no node_to_cpumask_map!\n",
node);
dump_stack();
return cpu_online_mask;
}
return &node_to_cpumask_map[node];
}
EXPORT_SYMBOL(cpumask_of_node);

14
arch/x86/mm/numa_64.c
View file

@ -681,12 +681,12 @@ void __cpuinit numa_clear_node(int cpu)
void __cpuinit numa_add_cpu(int cpu)
{
cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
}
void __cpuinit numa_remove_cpu(int cpu)
{
cpu_clear(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
}
#else /* CONFIG_DEBUG_PER_CPU_MAPS */
@ -700,17 +700,17 @@ static void __cpuinit numa_set_cpumask(int cpu, int enable)
cpumask_t *mask;
char buf[64];
if (node_to_cpumask_map == NULL) {
printk(KERN_ERR "node_to_cpumask_map NULL\n");
mask = node_to_cpumask_map[node];
if (mask == NULL) {
printk(KERN_ERR "node_to_cpumask_map[%i] NULL\n", node);
dump_stack();
return;
}
mask = &node_to_cpumask_map[node];
if (enable)
cpu_set(cpu, *mask);
cpumask_set_cpu(cpu, mask);
else
cpu_clear(cpu, *mask);
cpumask_clear_cpu(cpu, mask);
cpulist_scnprintf(buf, sizeof(buf), mask);
printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",