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-rw-r--r--mm/page_cgroup.c530
1 files changed, 0 insertions, 530 deletions
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
deleted file mode 100644
index 5331c2bd85a2..000000000000
--- a/mm/page_cgroup.c
+++ /dev/null
@@ -1,530 +0,0 @@
-#include <linux/mm.h>
-#include <linux/mmzone.h>
-#include <linux/bootmem.h>
-#include <linux/bit_spinlock.h>
-#include <linux/page_cgroup.h>
-#include <linux/hash.h>
-#include <linux/slab.h>
-#include <linux/memory.h>
-#include <linux/vmalloc.h>
-#include <linux/cgroup.h>
-#include <linux/swapops.h>
-#include <linux/kmemleak.h>
-
-static unsigned long total_usage;
-
-#if !defined(CONFIG_SPARSEMEM)
-
-
-void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
-{
- pgdat->node_page_cgroup = NULL;
-}
-
-struct page_cgroup *lookup_page_cgroup(struct page *page)
-{
- unsigned long pfn = page_to_pfn(page);
- unsigned long offset;
- struct page_cgroup *base;
-
- base = NODE_DATA(page_to_nid(page))->node_page_cgroup;
-#ifdef CONFIG_DEBUG_VM
- /*
- * The sanity checks the page allocator does upon freeing a
- * page can reach here before the page_cgroup arrays are
- * allocated when feeding a range of pages to the allocator
- * for the first time during bootup or memory hotplug.
- */
- if (unlikely(!base))
- return NULL;
-#endif
- offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn;
- return base + offset;
-}
-
-static int __init alloc_node_page_cgroup(int nid)
-{
- struct page_cgroup *base;
- unsigned long table_size;
- unsigned long nr_pages;
-
- nr_pages = NODE_DATA(nid)->node_spanned_pages;
- if (!nr_pages)
- return 0;
-
- table_size = sizeof(struct page_cgroup) * nr_pages;
-
- base = memblock_virt_alloc_try_nid_nopanic(
- table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
- BOOTMEM_ALLOC_ACCESSIBLE, nid);
- if (!base)
- return -ENOMEM;
- NODE_DATA(nid)->node_page_cgroup = base;
- total_usage += table_size;
- return 0;
-}
-
-void __init page_cgroup_init_flatmem(void)
-{
-
- int nid, fail;
-
- if (mem_cgroup_disabled())
- return;
-
- for_each_online_node(nid) {
- fail = alloc_node_page_cgroup(nid);
- if (fail)
- goto fail;
- }
- printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
- printk(KERN_INFO "please try 'cgroup_disable=memory' option if you"
- " don't want memory cgroups\n");
- return;
-fail:
- printk(KERN_CRIT "allocation of page_cgroup failed.\n");
- printk(KERN_CRIT "please try 'cgroup_disable=memory' boot option\n");
- panic("Out of memory");
-}
-
-#else /* CONFIG_FLAT_NODE_MEM_MAP */
-
-struct page_cgroup *lookup_page_cgroup(struct page *page)
-{
- unsigned long pfn = page_to_pfn(page);
- struct mem_section *section = __pfn_to_section(pfn);
-#ifdef CONFIG_DEBUG_VM
- /*
- * The sanity checks the page allocator does upon freeing a
- * page can reach here before the page_cgroup arrays are
- * allocated when feeding a range of pages to the allocator
- * for the first time during bootup or memory hotplug.
- */
- if (!section->page_cgroup)
- return NULL;
-#endif
- return section->page_cgroup + pfn;
-}
-
-static void *__meminit alloc_page_cgroup(size_t size, int nid)
-{
- gfp_t flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN;
- void *addr = NULL;
-
- addr = alloc_pages_exact_nid(nid, size, flags);
- if (addr) {
- kmemleak_alloc(addr, size, 1, flags);
- return addr;
- }
-
- if (node_state(nid, N_HIGH_MEMORY))
- addr = vzalloc_node(size, nid);
- else
- addr = vzalloc(size);
-
- return addr;
-}
-
-static int __meminit init_section_page_cgroup(unsigned long pfn, int nid)
-{
- struct mem_section *section;
- struct page_cgroup *base;
- unsigned long table_size;
-
- section = __pfn_to_section(pfn);
-
- if (section->page_cgroup)
- return 0;
-
- table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
- base = alloc_page_cgroup(table_size, nid);
-
- /*
- * The value stored in section->page_cgroup is (base - pfn)
- * and it does not point to the memory block allocated above,
- * causing kmemleak false positives.
- */
- kmemleak_not_leak(base);
-
- if (!base) {
- printk(KERN_ERR "page cgroup allocation failure\n");
- return -ENOMEM;
- }
-
- /*
- * The passed "pfn" may not be aligned to SECTION. For the calculation
- * we need to apply a mask.
- */
- pfn &= PAGE_SECTION_MASK;
- section->page_cgroup = base - pfn;
- total_usage += table_size;
- return 0;
-}
-#ifdef CONFIG_MEMORY_HOTPLUG
-static void free_page_cgroup(void *addr)
-{
- if (is_vmalloc_addr(addr)) {
- vfree(addr);
- } else {
- struct page *page = virt_to_page(addr);
- size_t table_size =
- sizeof(struct page_cgroup) * PAGES_PER_SECTION;
-
- BUG_ON(PageReserved(page));
- kmemleak_free(addr);
- free_pages_exact(addr, table_size);
- }
-}
-
-static void __free_page_cgroup(unsigned long pfn)
-{
- struct mem_section *ms;
- struct page_cgroup *base;
-
- ms = __pfn_to_section(pfn);
- if (!ms || !ms->page_cgroup)
- return;
- base = ms->page_cgroup + pfn;
- free_page_cgroup(base);
- ms->page_cgroup = NULL;
-}
-
-static int __meminit online_page_cgroup(unsigned long start_pfn,
- unsigned long nr_pages,
- int nid)
-{
- unsigned long start, end, pfn;
- int fail = 0;
-
- start = SECTION_ALIGN_DOWN(start_pfn);
- end = SECTION_ALIGN_UP(start_pfn + nr_pages);
-
- if (nid == -1) {
- /*
- * In this case, "nid" already exists and contains valid memory.
- * "start_pfn" passed to us is a pfn which is an arg for
- * online__pages(), and start_pfn should exist.
- */
- nid = pfn_to_nid(start_pfn);
- VM_BUG_ON(!node_state(nid, N_ONLINE));
- }
-
- for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
- if (!pfn_present(pfn))
- continue;
- fail = init_section_page_cgroup(pfn, nid);
- }
- if (!fail)
- return 0;
-
- /* rollback */
- for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
- __free_page_cgroup(pfn);
-
- return -ENOMEM;
-}
-
-static int __meminit offline_page_cgroup(unsigned long start_pfn,
- unsigned long nr_pages, int nid)
-{
- unsigned long start, end, pfn;
-
- start = SECTION_ALIGN_DOWN(start_pfn);
- end = SECTION_ALIGN_UP(start_pfn + nr_pages);
-
- for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
- __free_page_cgroup(pfn);
- return 0;
-
-}
-
-static int __meminit page_cgroup_callback(struct notifier_block *self,
- unsigned long action, void *arg)
-{
- struct memory_notify *mn = arg;
- int ret = 0;
- switch (action) {
- case MEM_GOING_ONLINE:
- ret = online_page_cgroup(mn->start_pfn,
- mn->nr_pages, mn->status_change_nid);
- break;
- case MEM_OFFLINE:
- offline_page_cgroup(mn->start_pfn,
- mn->nr_pages, mn->status_change_nid);
- break;
- case MEM_CANCEL_ONLINE:
- offline_page_cgroup(mn->start_pfn,
- mn->nr_pages, mn->status_change_nid);
- break;
- case MEM_GOING_OFFLINE:
- break;
- case MEM_ONLINE:
- case MEM_CANCEL_OFFLINE:
- break;
- }
-
- return notifier_from_errno(ret);
-}
-
-#endif
-
-void __init page_cgroup_init(void)
-{
- unsigned long pfn;
- int nid;
-
- if (mem_cgroup_disabled())
- return;
-
- for_each_node_state(nid, N_MEMORY) {
- unsigned long start_pfn, end_pfn;
-
- start_pfn = node_start_pfn(nid);
- end_pfn = node_end_pfn(nid);
- /*
- * start_pfn and end_pfn may not be aligned to SECTION and the
- * page->flags of out of node pages are not initialized. So we
- * scan [start_pfn, the biggest section's pfn < end_pfn) here.
- */
- for (pfn = start_pfn;
- pfn < end_pfn;
- pfn = ALIGN(pfn + 1, PAGES_PER_SECTION)) {
-
- if (!pfn_valid(pfn))
- continue;
- /*
- * Nodes's pfns can be overlapping.
- * We know some arch can have a nodes layout such as
- * -------------pfn-------------->
- * N0 | N1 | N2 | N0 | N1 | N2|....
- */
- if (pfn_to_nid(pfn) != nid)
- continue;
- if (init_section_page_cgroup(pfn, nid))
- goto oom;
- }
- }
- hotplug_memory_notifier(page_cgroup_callback, 0);
- printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
- printk(KERN_INFO "please try 'cgroup_disable=memory' option if you "
- "don't want memory cgroups\n");
- return;
-oom:
- printk(KERN_CRIT "try 'cgroup_disable=memory' boot option\n");
- panic("Out of memory");
-}
-
-void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
-{
- return;
-}
-
-#endif
-
-
-#ifdef CONFIG_MEMCG_SWAP
-
-static DEFINE_MUTEX(swap_cgroup_mutex);
-struct swap_cgroup_ctrl {
- struct page **map;
- unsigned long length;
- spinlock_t lock;
-};
-
-static struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
-
-struct swap_cgroup {
- unsigned short id;
-};
-#define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup))
-
-/*
- * SwapCgroup implements "lookup" and "exchange" operations.
- * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge
- * against SwapCache. At swap_free(), this is accessed directly from swap.
- *
- * This means,
- * - we have no race in "exchange" when we're accessed via SwapCache because
- * SwapCache(and its swp_entry) is under lock.
- * - When called via swap_free(), there is no user of this entry and no race.
- * Then, we don't need lock around "exchange".
- *
- * TODO: we can push these buffers out to HIGHMEM.
- */
-
-/*
- * allocate buffer for swap_cgroup.
- */
-static int swap_cgroup_prepare(int type)
-{
- struct page *page;
- struct swap_cgroup_ctrl *ctrl;
- unsigned long idx, max;
-
- ctrl = &swap_cgroup_ctrl[type];
-
- for (idx = 0; idx < ctrl->length; idx++) {
- page = alloc_page(GFP_KERNEL | __GFP_ZERO);
- if (!page)
- goto not_enough_page;
- ctrl->map[idx] = page;
- }
- return 0;
-not_enough_page:
- max = idx;
- for (idx = 0; idx < max; idx++)
- __free_page(ctrl->map[idx]);
-
- return -ENOMEM;
-}
-
-static struct swap_cgroup *lookup_swap_cgroup(swp_entry_t ent,
- struct swap_cgroup_ctrl **ctrlp)
-{
- pgoff_t offset = swp_offset(ent);
- struct swap_cgroup_ctrl *ctrl;
- struct page *mappage;
- struct swap_cgroup *sc;
-
- ctrl = &swap_cgroup_ctrl[swp_type(ent)];
- if (ctrlp)
- *ctrlp = ctrl;
-
- mappage = ctrl->map[offset / SC_PER_PAGE];
- sc = page_address(mappage);
- return sc + offset % SC_PER_PAGE;
-}
-
-/**
- * swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry.
- * @ent: swap entry to be cmpxchged
- * @old: old id
- * @new: new id
- *
- * Returns old id at success, 0 at failure.
- * (There is no mem_cgroup using 0 as its id)
- */
-unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
- unsigned short old, unsigned short new)
-{
- struct swap_cgroup_ctrl *ctrl;
- struct swap_cgroup *sc;
- unsigned long flags;
- unsigned short retval;
-
- sc = lookup_swap_cgroup(ent, &ctrl);
-
- spin_lock_irqsave(&ctrl->lock, flags);
- retval = sc->id;
- if (retval == old)
- sc->id = new;
- else
- retval = 0;
- spin_unlock_irqrestore(&ctrl->lock, flags);
- return retval;
-}
-
-/**
- * swap_cgroup_record - record mem_cgroup for this swp_entry.
- * @ent: swap entry to be recorded into
- * @id: mem_cgroup to be recorded
- *
- * Returns old value at success, 0 at failure.
- * (Of course, old value can be 0.)
- */
-unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
-{
- struct swap_cgroup_ctrl *ctrl;
- struct swap_cgroup *sc;
- unsigned short old;
- unsigned long flags;
-
- sc = lookup_swap_cgroup(ent, &ctrl);
-
- spin_lock_irqsave(&ctrl->lock, flags);
- old = sc->id;
- sc->id = id;
- spin_unlock_irqrestore(&ctrl->lock, flags);
-
- return old;
-}
-
-/**
- * lookup_swap_cgroup_id - lookup mem_cgroup id tied to swap entry
- * @ent: swap entry to be looked up.
- *
- * Returns ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
- */
-unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
-{
- return lookup_swap_cgroup(ent, NULL)->id;
-}
-
-int swap_cgroup_swapon(int type, unsigned long max_pages)
-{
- void *array;
- unsigned long array_size;
- unsigned long length;
- struct swap_cgroup_ctrl *ctrl;
-
- if (!do_swap_account)
- return 0;
-
- length = DIV_ROUND_UP(max_pages, SC_PER_PAGE);
- array_size = length * sizeof(void *);
-
- array = vzalloc(array_size);
- if (!array)
- goto nomem;
-
- ctrl = &swap_cgroup_ctrl[type];
- mutex_lock(&swap_cgroup_mutex);
- ctrl->length = length;
- ctrl->map = array;
- spin_lock_init(&ctrl->lock);
- if (swap_cgroup_prepare(type)) {
- /* memory shortage */
- ctrl->map = NULL;
- ctrl->length = 0;
- mutex_unlock(&swap_cgroup_mutex);
- vfree(array);
- goto nomem;
- }
- mutex_unlock(&swap_cgroup_mutex);
-
- return 0;
-nomem:
- printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");
- printk(KERN_INFO
- "swap_cgroup can be disabled by swapaccount=0 boot option\n");
- return -ENOMEM;
-}
-
-void swap_cgroup_swapoff(int type)
-{
- struct page **map;
- unsigned long i, length;
- struct swap_cgroup_ctrl *ctrl;
-
- if (!do_swap_account)
- return;
-
- mutex_lock(&swap_cgroup_mutex);
- ctrl = &swap_cgroup_ctrl[type];
- map = ctrl->map;
- length = ctrl->length;
- ctrl->map = NULL;
- ctrl->length = 0;
- mutex_unlock(&swap_cgroup_mutex);
-
- if (map) {
- for (i = 0; i < length; i++) {
- struct page *page = map[i];
- if (page)
- __free_page(page);
- }
- vfree(map);
- }
-}
-
-#endif