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authorTejun Heo <tj@kernel.org>2009-02-20 16:29:09 +0900
committerTejun Heo <tj@kernel.org>2009-02-20 16:29:09 +0900
commit11124411aa95827404d6bfdfc14c908e1b54513c (patch)
treee613edf6df9d1130e0ebe853ba1390c8389b25b3 /arch/x86/kernel/setup_percpu.c
parentfbf59bc9d74d1fb30b8e0630743aff2806eafcea (diff)
x86: convert to the new dynamic percpu allocator
Impact: use new dynamic allocator, unified access to static/dynamic percpu memory Convert to the new dynamic percpu allocator. * implement populate_extra_pte() for both 32 and 64 * update setup_per_cpu_areas() to use pcpu_setup_static() * define __addr_to_pcpu_ptr() and __pcpu_ptr_to_addr() * define config HAVE_DYNAMIC_PER_CPU_AREA Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'arch/x86/kernel/setup_percpu.c')
-rw-r--r--arch/x86/kernel/setup_percpu.c62
1 files changed, 40 insertions, 22 deletions
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index d992e6cff73..2dce4355821 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -61,38 +61,56 @@ static inline void setup_percpu_segment(int cpu)
*/
void __init setup_per_cpu_areas(void)
{
- ssize_t size;
- char *ptr;
- int cpu;
-
- /* Copy section for each CPU (we discard the original) */
- size = roundup(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
+ ssize_t size = __per_cpu_end - __per_cpu_start;
+ unsigned int nr_cpu_pages = DIV_ROUND_UP(size, PAGE_SIZE);
+ static struct page **pages;
+ size_t pages_size;
+ unsigned int cpu, i, j;
+ unsigned long delta;
+ size_t pcpu_unit_size;
pr_info("NR_CPUS:%d nr_cpumask_bits:%d nr_cpu_ids:%d nr_node_ids:%d\n",
NR_CPUS, nr_cpumask_bits, nr_cpu_ids, nr_node_ids);
+ pr_info("PERCPU: Allocating %zd bytes for static per cpu data\n", size);
- pr_info("PERCPU: Allocating %zd bytes of per cpu data\n", size);
+ pages_size = nr_cpu_pages * num_possible_cpus() * sizeof(pages[0]);
+ pages = alloc_bootmem(pages_size);
+ j = 0;
for_each_possible_cpu(cpu) {
+ void *ptr;
+
+ for (i = 0; i < nr_cpu_pages; i++) {
#ifndef CONFIG_NEED_MULTIPLE_NODES
- ptr = alloc_bootmem_pages(size);
+ ptr = alloc_bootmem_pages(PAGE_SIZE);
#else
- int node = early_cpu_to_node(cpu);
- if (!node_online(node) || !NODE_DATA(node)) {
- ptr = alloc_bootmem_pages(size);
- pr_info("cpu %d has no node %d or node-local memory\n",
- cpu, node);
- pr_debug("per cpu data for cpu%d at %016lx\n",
- cpu, __pa(ptr));
- } else {
- ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
- pr_debug("per cpu data for cpu%d on node%d at %016lx\n",
- cpu, node, __pa(ptr));
- }
+ int node = early_cpu_to_node(cpu);
+
+ if (!node_online(node) || !NODE_DATA(node)) {
+ ptr = alloc_bootmem_pages(PAGE_SIZE);
+ pr_info("cpu %d has no node %d or node-local "
+ "memory\n", cpu, node);
+ pr_debug("per cpu data for cpu%d at %016lx\n",
+ cpu, __pa(ptr));
+ } else {
+ ptr = alloc_bootmem_pages_node(NODE_DATA(node),
+ PAGE_SIZE);
+ pr_debug("per cpu data for cpu%d on node%d "
+ "at %016lx\n", cpu, node, __pa(ptr));
+ }
#endif
+ memcpy(ptr, __per_cpu_load + i * PAGE_SIZE, PAGE_SIZE);
+ pages[j++] = virt_to_page(ptr);
+ }
+ }
+
+ pcpu_unit_size = pcpu_setup_static(populate_extra_pte, pages, size);
- memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start);
- per_cpu_offset(cpu) = ptr - __per_cpu_start;
+ free_bootmem(__pa(pages), pages_size);
+
+ delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
+ for_each_possible_cpu(cpu) {
+ per_cpu_offset(cpu) = delta + cpu * pcpu_unit_size;
per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
per_cpu(cpu_number, cpu) = cpu;
setup_percpu_segment(cpu);