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arm64/numa: support HAVE_SETUP_PER_CPU_AREA

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To make each percpu area allocated from its local numa node. Without this
patch, all percpu areas will be allocated from the node which cpu0 belongs
to.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Zhen Lei 2016-09-01 14:55:00 +08:00 committed by Will Deacon
parent f11c7bacd5
commit 7af3a0a992
2 changed files with 60 additions and 0 deletions
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8
arch/arm64/Kconfig
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@ -600,6 +600,14 @@ config USE_PERCPU_NUMA_NODE_ID
def_bool y
depends on NUMA
config HAVE_SETUP_PER_CPU_AREA
def_bool y
depends on NUMA
config NEED_PER_CPU_EMBED_FIRST_CHUNK
def_bool y
depends on NUMA
source kernel/Kconfig.preempt
source kernel/Kconfig.hz

52
arch/arm64/mm/numa.c
View File

@ -26,6 +26,7 @@
#include <linux/of.h>
#include <asm/acpi.h>
#include <asm/sections.h>
struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL(node_data);
@ -131,6 +132,57 @@ void __init early_map_cpu_to_node(unsigned int cpu, int nid)
cpu_to_node_map[cpu] = nid;
}
#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(__per_cpu_offset);
static int __init early_cpu_to_node(int cpu)
{
return cpu_to_node_map[cpu];
}
static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
{
return node_distance(from, to);
}
static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size,
size_t align)
{
int nid = early_cpu_to_node(cpu);
return memblock_virt_alloc_try_nid(size, align,
__pa(MAX_DMA_ADDRESS), MEMBLOCK_ALLOC_ACCESSIBLE, nid);
}
static void __init pcpu_fc_free(void *ptr, size_t size)
{
memblock_free_early(__pa(ptr), size);
}
void __init setup_per_cpu_areas(void)
{
unsigned long delta;
unsigned int cpu;
int rc;
/*
* Always reserve area for module percpu variables. That's
* what the legacy allocator did.
*/
rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
pcpu_cpu_distance,
pcpu_fc_alloc, pcpu_fc_free);
if (rc < 0)
panic("Failed to initialize percpu areas.");
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
for_each_possible_cpu(cpu)
__per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
}
#endif
/**
* numa_add_memblk - Set node id to memblk
* @nid: NUMA node ID of the new memblk