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