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[IA64] Minimize per_cpu reservations.

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This attached patch significantly shrinks boot memory allocation on ia64.
It does this by not allocating per_cpu areas for cpus that can never
exist.

In the case where acpi does not have any numa node description of the
cpus, I defaulted to assigning the first 32 round-robin on the known
nodes..  For the !CONFIG_ACPI  I used for_each_possible_cpu().

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
holt@sgi.com
2008-04-03 15:17:13 -05:00
committed by Tony Luck
parent 41bd26d67c
commit 2c6e6db41f
7 changed files with 48 additions and 11 deletions
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12
arch/ia64/mm/discontig.c
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@@ -104,7 +104,7 @@ static int __meminit early_nr_cpus_node(int node)
{
int cpu, n = 0;
for (cpu = 0; cpu < NR_CPUS; cpu++)
for_each_possible_early_cpu(cpu)
if (node == node_cpuid[cpu].nid)
n++;
@@ -143,7 +143,7 @@ static void *per_cpu_node_setup(void *cpu_data, int node)
#ifdef CONFIG_SMP
int cpu;
for (cpu = 0; cpu < NR_CPUS; cpu++) {
for_each_possible_early_cpu(cpu) {
if (node == node_cpuid[cpu].nid) {
memcpy(__va(cpu_data), __phys_per_cpu_start,
__per_cpu_end - __per_cpu_start);
@@ -346,7 +346,7 @@ static void __init initialize_pernode_data(void)
#ifdef CONFIG_SMP
/* Set the node_data pointer for each per-cpu struct */
for (cpu = 0; cpu < NR_CPUS; cpu++) {
for_each_possible_early_cpu(cpu) {
node = node_cpuid[cpu].nid;
per_cpu(cpu_info, cpu).node_data = mem_data[node].node_data;
}
@@ -494,13 +494,9 @@ void __cpuinit *per_cpu_init(void)
int cpu;
static int first_time = 1;
if (smp_processor_id() != 0)
return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
if (first_time) {
first_time = 0;
for (cpu = 0; cpu < NR_CPUS; cpu++)
for_each_possible_early_cpu(cpu)
per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
}