Commit 365ba917 authored by Ravikiran G Thirumalai's avatar Ravikiran G Thirumalai Committed by Linus Torvalds
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[PATCH] x86_64: Allocate PDAs in the local node

Patch uses a static PDA array early at boot and reallocates processor PDA
with node local memory when kmalloc is ready, just before pda_init.
The boot_cpu_pda is needed since the cpu_pda is used even before pda_init for
that cpu is called (to set the static per-cpu areas offset table etc)

Signed-off-by: default avatarRavikiran Thirumalai <>
Signed-off-by: default avatarShai Fultheim <>
Signed-off-by: default avatarAndi Kleen <>
Signed-off-by: default avatarLinus Torvalds <>
parent df79efde
......@@ -92,6 +92,9 @@ void __init x86_64_start_kernel(char * real_mode_data)
memcpy(init_level4_pgt, boot_level4_pgt, PTRS_PER_PGD*sizeof(pgd_t));
asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt)));
for (i = 0; i < NR_CPUS; i++)
cpu_pda(i) = &boot_cpu_pda[i];
......@@ -30,7 +30,8 @@ char x86_boot_params[BOOT_PARAM_SIZE] __initdata = {0,};
cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE;
struct x8664_pda _cpu_pda[NR_CPUS] __cacheline_aligned;
struct x8664_pda *_cpu_pda[NR_CPUS] __read_mostly;
struct x8664_pda boot_cpu_pda[NR_CPUS] __cacheline_aligned;
struct desc_ptr idt_descr = { 256 * 16, (unsigned long) idt_table };
......@@ -757,6 +757,23 @@ static int __cpuinit do_boot_cpu(int cpu, int apicid)
return -1;
/* Allocate node local memory for AP pdas */
if (cpu_pda(cpu) == &boot_cpu_pda[cpu]) {
struct x8664_pda *newpda, *pda;
int node = cpu_to_node(cpu);
pda = cpu_pda(cpu);
newpda = kmalloc_node(sizeof (struct x8664_pda), GFP_ATOMIC,
if (newpda) {
memcpy(newpda, pda, sizeof (struct x8664_pda));
cpu_pda(cpu) = newpda;
} else
"Could not allocate node local PDA for CPU %d on node %d\n",
cpu, node);
c_idle.idle = get_idle_for_cpu(cpu);
if (c_idle.idle) {
......@@ -27,9 +27,10 @@ struct x8664_pda {
unsigned apic_timer_irqs;
} ____cacheline_aligned_in_smp;
extern struct x8664_pda _cpu_pda[];
extern struct x8664_pda *_cpu_pda[];
extern struct x8664_pda boot_cpu_pda[];
#define cpu_pda(i) (&_cpu_pda[i])
#define cpu_pda(i) (_cpu_pda[i])
* There is no fast way to get the base address of the PDA, all the accesses
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