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cpumask: convert struct cpuinfo_x86's llc_shared_map to cpumask_var_t

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Impact: reduce kernel memory usage when CONFIG_CPUMASK_OFFSTACK=y

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2009-03-13 14:49:53 +10:30
commit 155dd720d0
2 changed files with 27 additions and 8 deletions
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2
arch/x86/include/asm/processor.h
View file

@ -94,7 +94,7 @@ struct cpuinfo_x86 {
unsigned long loops_per_jiffy;
#ifdef CONFIG_SMP
/* cpus sharing the last level cache: */
cpumask_t llc_shared_map;
cpumask_var_t llc_shared_map;
#endif
/* cpuid returned max cores value: */
u16 x86_max_cores;

33
arch/x86/kernel/smpboot.c
View file

@ -329,6 +329,23 @@ notrace static void __cpuinit start_secondary(void *unused)
cpu_idle();
}
#ifdef CONFIG_CPUMASK_OFFSTACK
/* In this case, llc_shared_map is a pointer to a cpumask. */
static inline void copy_cpuinfo_x86(struct cpuinfo_x86 *dst,
const struct cpuinfo_x86 *src)
{
struct cpumask *llc = dst->llc_shared_map;
*dst = *src;
dst->llc_shared_map = llc;
}
#else
static inline void copy_cpuinfo_x86(struct cpuinfo_x86 *dst,
const struct cpuinfo_x86 *src)
{
*dst = *src;
}
#endif /* CONFIG_CPUMASK_OFFSTACK */
/*
* The bootstrap kernel entry code has set these up. Save them for
* a given CPU
@ -338,7 +355,7 @@ void __cpuinit smp_store_cpu_info(int id)
{
struct cpuinfo_x86 *c = &cpu_data(id);
*c = boot_cpu_data;
copy_cpuinfo_x86(c, &boot_cpu_data);
c->cpu_index = id;
if (id != 0)
identify_secondary_cpu(c);
@ -362,15 +379,15 @@ void __cpuinit set_cpu_sibling_map(int cpu)
cpumask_set_cpu(cpu, cpu_sibling_mask(i));
cpumask_set_cpu(i, cpu_core_mask(cpu));
cpumask_set_cpu(cpu, cpu_core_mask(i));
cpumask_set_cpu(i, &c->llc_shared_map);
cpumask_set_cpu(cpu, &o->llc_shared_map);
cpumask_set_cpu(i, c->llc_shared_map);
cpumask_set_cpu(cpu, o->llc_shared_map);
}
}
} else {
cpumask_set_cpu(cpu, cpu_sibling_mask(cpu));
}
cpumask_set_cpu(cpu, &c->llc_shared_map);
cpumask_set_cpu(cpu, c->llc_shared_map);
if (current_cpu_data.x86_max_cores == 1) {
cpumask_copy(cpu_core_mask(cpu), cpu_sibling_mask(cpu));
@ -381,8 +398,8 @@ void __cpuinit set_cpu_sibling_map(int cpu)
for_each_cpu(i, cpu_sibling_setup_mask) {
if (per_cpu(cpu_llc_id, cpu) != BAD_APICID &&
per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {
cpumask_set_cpu(i, &c->llc_shared_map);
cpumask_set_cpu(cpu, &cpu_data(i).llc_shared_map);
cpumask_set_cpu(i, c->llc_shared_map);
cpumask_set_cpu(cpu, cpu_data(i).llc_shared_map);
}
if (c->phys_proc_id == cpu_data(i).phys_proc_id) {
cpumask_set_cpu(i, cpu_core_mask(cpu));
@ -420,7 +437,7 @@ const struct cpumask *cpu_coregroup_mask(int cpu)
if (sched_mc_power_savings || sched_smt_power_savings)
return cpu_core_mask(cpu);
else
return &c->llc_shared_map;
return c->llc_shared_map;
}
static void impress_friends(void)
@ -1039,8 +1056,10 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
for_each_possible_cpu(i) {
alloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
alloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
alloc_cpumask_var(&cpu_data(i).llc_shared_map, GFP_KERNEL);
cpumask_clear(per_cpu(cpu_core_map, i));
cpumask_clear(per_cpu(cpu_sibling_map, i));
cpumask_clear(cpu_data(i).llc_shared_map);
}
set_cpu_sibling_map(0);