2008-10-18 20:28:16 -07:00
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/bootmem.h>
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#include <linux/bit_spinlock.h>
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#include <linux/page_cgroup.h>
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#include <linux/hash.h>
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2008-10-22 14:15:05 -07:00
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#include <linux/slab.h>
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2008-10-18 20:28:16 -07:00
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#include <linux/memory.h>
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2008-10-22 14:14:58 -07:00
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#include <linux/vmalloc.h>
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2008-10-22 14:15:05 -07:00
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#include <linux/cgroup.h>
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2008-10-18 20:28:16 -07:00
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static void __meminit
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__init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
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{
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pc->flags = 0;
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pc->mem_cgroup = NULL;
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pc->page = pfn_to_page(pfn);
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}
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static unsigned long total_usage;
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#if !defined(CONFIG_SPARSEMEM)
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2008-11-22 10:33:24 -07:00
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void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
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2008-10-18 20:28:16 -07:00
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{
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pgdat->node_page_cgroup = NULL;
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}
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struct page_cgroup *lookup_page_cgroup(struct page *page)
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{
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unsigned long pfn = page_to_pfn(page);
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unsigned long offset;
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struct page_cgroup *base;
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base = NODE_DATA(page_to_nid(page))->node_page_cgroup;
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if (unlikely(!base))
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return NULL;
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offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn;
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return base + offset;
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}
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static int __init alloc_node_page_cgroup(int nid)
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{
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struct page_cgroup *base, *pc;
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unsigned long table_size;
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unsigned long start_pfn, nr_pages, index;
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start_pfn = NODE_DATA(nid)->node_start_pfn;
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nr_pages = NODE_DATA(nid)->node_spanned_pages;
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2008-12-09 14:14:20 -07:00
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if (!nr_pages)
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return 0;
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2008-10-18 20:28:16 -07:00
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table_size = sizeof(struct page_cgroup) * nr_pages;
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base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
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table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
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if (!base)
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return -ENOMEM;
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for (index = 0; index < nr_pages; index++) {
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pc = base + index;
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__init_page_cgroup(pc, start_pfn + index);
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}
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NODE_DATA(nid)->node_page_cgroup = base;
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total_usage += table_size;
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return 0;
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}
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void __init page_cgroup_init(void)
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{
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int nid, fail;
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2008-10-22 14:15:05 -07:00
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if (mem_cgroup_subsys.disabled)
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return;
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2008-10-18 20:28:16 -07:00
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for_each_online_node(nid) {
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fail = alloc_node_page_cgroup(nid);
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if (fail)
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goto fail;
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}
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printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
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printk(KERN_INFO "please try cgroup_disable=memory option if you"
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" don't want\n");
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return;
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fail:
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printk(KERN_CRIT "allocation of page_cgroup was failed.\n");
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printk(KERN_CRIT "please try cgroup_disable=memory boot option\n");
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panic("Out of memory");
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}
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#else /* CONFIG_FLAT_NODE_MEM_MAP */
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struct page_cgroup *lookup_page_cgroup(struct page *page)
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{
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unsigned long pfn = page_to_pfn(page);
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struct mem_section *section = __pfn_to_section(pfn);
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return section->page_cgroup + pfn;
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}
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2008-11-22 10:33:24 -07:00
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/* __alloc_bootmem...() is protected by !slab_available() */
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int __init_refok init_section_page_cgroup(unsigned long pfn)
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2008-10-18 20:28:16 -07:00
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{
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struct mem_section *section;
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struct page_cgroup *base, *pc;
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unsigned long table_size;
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int nid, index;
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section = __pfn_to_section(pfn);
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2008-12-01 14:13:48 -07:00
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if (!section->page_cgroup) {
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nid = page_to_nid(pfn_to_page(pfn));
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table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
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if (slab_is_available()) {
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base = kmalloc_node(table_size, GFP_KERNEL, nid);
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if (!base)
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base = vmalloc_node(table_size, nid);
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} else {
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base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
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table_size,
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2008-10-22 14:15:05 -07:00
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PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
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2008-12-01 14:13:48 -07:00
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}
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} else {
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/*
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* We don't have to allocate page_cgroup again, but
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* address of memmap may be changed. So, we have to initialize
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* again.
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*/
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base = section->page_cgroup + pfn;
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table_size = 0;
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/* check address of memmap is changed or not. */
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if (base->page == pfn_to_page(pfn))
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return 0;
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2008-10-22 14:15:05 -07:00
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}
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2008-10-18 20:28:16 -07:00
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if (!base) {
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printk(KERN_ERR "page cgroup allocation failure\n");
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return -ENOMEM;
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}
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for (index = 0; index < PAGES_PER_SECTION; index++) {
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pc = base + index;
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__init_page_cgroup(pc, pfn + index);
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}
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section = __pfn_to_section(pfn);
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section->page_cgroup = base - pfn;
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total_usage += table_size;
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return 0;
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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void __free_page_cgroup(unsigned long pfn)
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{
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struct mem_section *ms;
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struct page_cgroup *base;
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ms = __pfn_to_section(pfn);
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if (!ms || !ms->page_cgroup)
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return;
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base = ms->page_cgroup + pfn;
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2008-10-22 14:15:05 -07:00
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if (is_vmalloc_addr(base)) {
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2008-10-18 20:28:16 -07:00
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vfree(base);
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2008-10-22 14:15:05 -07:00
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ms->page_cgroup = NULL;
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} else {
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struct page *page = virt_to_page(base);
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if (!PageReserved(page)) { /* Is bootmem ? */
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kfree(base);
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ms->page_cgroup = NULL;
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}
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}
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2008-10-18 20:28:16 -07:00
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}
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2008-11-22 10:33:24 -07:00
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int __meminit online_page_cgroup(unsigned long start_pfn,
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2008-10-18 20:28:16 -07:00
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unsigned long nr_pages,
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int nid)
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{
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unsigned long start, end, pfn;
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int fail = 0;
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2008-11-12 14:27:01 -07:00
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start = start_pfn & ~(PAGES_PER_SECTION - 1);
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2008-10-18 20:28:16 -07:00
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end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
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for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
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if (!pfn_present(pfn))
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continue;
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fail = init_section_page_cgroup(pfn);
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}
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if (!fail)
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return 0;
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/* rollback */
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for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
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__free_page_cgroup(pfn);
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return -ENOMEM;
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}
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2008-11-22 10:33:24 -07:00
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int __meminit offline_page_cgroup(unsigned long start_pfn,
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2008-10-18 20:28:16 -07:00
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unsigned long nr_pages, int nid)
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{
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unsigned long start, end, pfn;
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2008-11-12 14:27:01 -07:00
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start = start_pfn & ~(PAGES_PER_SECTION - 1);
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2008-10-18 20:28:16 -07:00
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end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
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for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
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__free_page_cgroup(pfn);
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return 0;
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}
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2008-11-22 10:33:24 -07:00
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static int __meminit page_cgroup_callback(struct notifier_block *self,
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2008-10-18 20:28:16 -07:00
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unsigned long action, void *arg)
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{
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struct memory_notify *mn = arg;
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int ret = 0;
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switch (action) {
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case MEM_GOING_ONLINE:
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ret = online_page_cgroup(mn->start_pfn,
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mn->nr_pages, mn->status_change_nid);
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break;
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case MEM_OFFLINE:
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offline_page_cgroup(mn->start_pfn,
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mn->nr_pages, mn->status_change_nid);
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break;
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2008-12-01 14:13:48 -07:00
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case MEM_CANCEL_ONLINE:
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2008-10-18 20:28:16 -07:00
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case MEM_GOING_OFFLINE:
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break;
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case MEM_ONLINE:
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case MEM_CANCEL_OFFLINE:
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break;
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}
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2008-12-01 14:13:48 -07:00
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if (ret)
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ret = notifier_from_errno(ret);
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else
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ret = NOTIFY_OK;
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2008-10-18 20:28:16 -07:00
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return ret;
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}
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#endif
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void __init page_cgroup_init(void)
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{
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unsigned long pfn;
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int fail = 0;
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2008-10-22 14:15:05 -07:00
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if (mem_cgroup_subsys.disabled)
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return;
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2008-10-18 20:28:16 -07:00
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for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
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if (!pfn_present(pfn))
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continue;
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fail = init_section_page_cgroup(pfn);
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}
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if (fail) {
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printk(KERN_CRIT "try cgroup_disable=memory boot option\n");
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panic("Out of memory");
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} else {
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hotplug_memory_notifier(page_cgroup_callback, 0);
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}
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printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
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printk(KERN_INFO "please try cgroup_disable=memory option if you don't"
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" want\n");
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}
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2008-11-22 10:33:24 -07:00
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void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
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2008-10-18 20:28:16 -07:00
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{
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return;
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}
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#endif
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