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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 <[email protected]>
Signed-off-by: Tony Luck <[email protected]>
This commit is contained in:
[email protected] 2008-04-03 15:17:13 -05:00 • committed by Tony Luck
commit 2c6e6db41f
7 changed files with 48 additions and 11 deletions
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33
include/asm-ia64/acpi.h
View file

@ -35,6 +35,7 @@
#include <linux/init.h>
#include <linux/numa.h>
#include <asm/system.h>
#include <asm/numa.h>
#define COMPILER_DEPENDENT_INT64 long
#define COMPILER_DEPENDENT_UINT64 unsigned long
@ -115,7 +116,11 @@ extern unsigned int is_cpu_cpei_target(unsigned int cpu);
extern void set_cpei_target_cpu(unsigned int cpu);
extern unsigned int get_cpei_target_cpu(void);
extern void prefill_possible_map(void);
#ifdef CONFIG_ACPI_HOTPLUG_CPU
extern int additional_cpus;
#else
#define additional_cpus 0
#endif
#ifdef CONFIG_ACPI_NUMA
#if MAX_NUMNODES > 256
@ -129,6 +134,34 @@ extern int __initdata nid_to_pxm_map[MAX_NUMNODES];
#define acpi_unlazy_tlb(x)
#ifdef CONFIG_ACPI_NUMA
extern cpumask_t early_cpu_possible_map;
#define for_each_possible_early_cpu(cpu) \
for_each_cpu_mask((cpu), early_cpu_possible_map)
static inline void per_cpu_scan_finalize(int min_cpus, int reserve_cpus)
{
int low_cpu, high_cpu;
int cpu;
int next_nid = 0;
low_cpu = cpus_weight(early_cpu_possible_map);
high_cpu = max(low_cpu, min_cpus);
high_cpu = min(high_cpu + reserve_cpus, NR_CPUS);
for (cpu = low_cpu; cpu < high_cpu; cpu++) {
cpu_set(cpu, early_cpu_possible_map);
if (node_cpuid[cpu].nid == NUMA_NO_NODE) {
node_cpuid[cpu].nid = next_nid;
next_nid++;
if (next_nid >= num_online_nodes())
next_nid = 0;
}
}
}
#endif /* CONFIG_ACPI_NUMA */
#endif /*__KERNEL__*/
#endif /*_ASM_ACPI_H*/

2
include/asm-ia64/numa.h
View file

@ -22,6 +22,8 @@
#include <asm/mmzone.h>
#define NUMA_NO_NODE -1
extern u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
extern cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
extern pg_data_t *pgdat_list[MAX_NUMNODES];