vmware balloon: rename module

In an effort to minimize customer confusion we want to unify naming
convention for VMware-provided kernel modules.  This change renames the
balloon driver from vmware_ballon to vmw_balloon.

We expect to follow this naming convention (vmw_<module_name>) for all
modules that are part of mainline kernel and/or being distributed by
VMware, with the sole exception of vmxnet3 driver (since the name of
mainline driver happens to match with the name used in VMware Tools).

Signed-off-by: Dmitry Torokhov <dtor@vmware.com>
Acked-by: Bhavesh Davda <bhavesh@vmware.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 844 deletions

diff --git a/drivers/misc/vmware_balloon.c b/drivers/misc/vmware_balloon.c
deleted file mode 100644
index 2a1e804..0000000
--- a/drivers/misc/vmware_balloon.c
+++ /dev/null
@@ -1,844 +0,0 @@
-/*
- * VMware Balloon driver.
- *
- * Copyright (C) 2000-2010, VMware, Inc. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; version 2 of the License and no later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT.  See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Maintained by: Dmitry Torokhov <dtor@vmware.com>
- */
-
-/*
- * This is VMware physical memory management driver for Linux. The driver
- * acts like a "balloon" that can be inflated to reclaim physical pages by
- * reserving them in the guest and invalidating them in the monitor,
- * freeing up the underlying machine pages so they can be allocated to
- * other guests.  The balloon can also be deflated to allow the guest to
- * use more physical memory. Higher level policies can control the sizes
- * of balloons in VMs in order to manage physical memory resources.
- */
-
-//#define DEBUG
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/module.h>
-#include <linux/workqueue.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <asm/hypervisor.h>
-
-MODULE_AUTHOR("VMware, Inc.");
-MODULE_DESCRIPTION("VMware Memory Control (Balloon) Driver");
-MODULE_VERSION("1.2.1.1-k");
-MODULE_ALIAS("dmi:*:svnVMware*:*");
-MODULE_ALIAS("vmware_vmmemctl");
-MODULE_LICENSE("GPL");
-
-/*
- * Various constants controlling rate of inflaint/deflating balloon,
- * measured in pages.
- */
-
-/*
- * Rate of allocating memory when there is no memory pressure
- * (driver performs non-sleeping allocations).
- */
-#define VMW_BALLOON_NOSLEEP_ALLOC_MAX	16384U
-
-/*
- * Rates of memory allocaton when guest experiences memory pressure
- * (driver performs sleeping allocations).
- */
-#define VMW_BALLOON_RATE_ALLOC_MIN	512U
-#define VMW_BALLOON_RATE_ALLOC_MAX	2048U
-#define VMW_BALLOON_RATE_ALLOC_INC	16U
-
-/*
- * Rates for releasing pages while deflating balloon.
- */
-#define VMW_BALLOON_RATE_FREE_MIN	512U
-#define VMW_BALLOON_RATE_FREE_MAX	16384U
-#define VMW_BALLOON_RATE_FREE_INC	16U
-
-/*
- * When guest is under memory pressure, use a reduced page allocation
- * rate for next several cycles.
- */
-#define VMW_BALLOON_SLOW_CYCLES		4
-
-/*
- * Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We don't
- * allow wait (__GFP_WAIT) for NOSLEEP page allocations. Use
- * __GFP_NOWARN, to suppress page allocation failure warnings.
- */
-#define VMW_PAGE_ALLOC_NOSLEEP		(__GFP_HIGHMEM|__GFP_NOWARN)
-
-/*
- * Use GFP_HIGHUSER when executing in a separate kernel thread
- * context and allocation can sleep.  This is less stressful to
- * the guest memory system, since it allows the thread to block
- * while memory is reclaimed, and won't take pages from emergency
- * low-memory pools.
- */
-#define VMW_PAGE_ALLOC_CANSLEEP		(GFP_HIGHUSER)
-
-/* Maximum number of page allocations without yielding processor */
-#define VMW_BALLOON_YIELD_THRESHOLD	1024
-
-/* Maximum number of refused pages we accumulate during inflation cycle */
-#define VMW_BALLOON_MAX_REFUSED		16
-
-/*
- * Hypervisor communication port definitions.
- */
-#define VMW_BALLOON_HV_PORT		0x5670
-#define VMW_BALLOON_HV_MAGIC		0x456c6d6f
-#define VMW_BALLOON_PROTOCOL_VERSION	2
-#define VMW_BALLOON_GUEST_ID		1	/* Linux */
-
-#define VMW_BALLOON_CMD_START		0
-#define VMW_BALLOON_CMD_GET_TARGET	1
-#define VMW_BALLOON_CMD_LOCK		2
-#define VMW_BALLOON_CMD_UNLOCK		3
-#define VMW_BALLOON_CMD_GUEST_ID	4
-
-/* error codes */
-#define VMW_BALLOON_SUCCESS		0
-#define VMW_BALLOON_FAILURE		-1
-#define VMW_BALLOON_ERROR_CMD_INVALID	1
-#define VMW_BALLOON_ERROR_PPN_INVALID	2
-#define VMW_BALLOON_ERROR_PPN_LOCKED	3
-#define VMW_BALLOON_ERROR_PPN_UNLOCKED	4
-#define VMW_BALLOON_ERROR_PPN_PINNED	5
-#define VMW_BALLOON_ERROR_PPN_NOTNEEDED	6
-#define VMW_BALLOON_ERROR_RESET		7
-#define VMW_BALLOON_ERROR_BUSY		8
-
-#define VMWARE_BALLOON_CMD(cmd, data, result)		\
-({							\
-	unsigned long __stat, __dummy1, __dummy2;	\
-	__asm__ __volatile__ ("inl (%%dx)" :		\
-		"=a"(__stat),				\
-		"=c"(__dummy1),				\
-		"=d"(__dummy2),				\
-		"=b"(result) :				\
-		"0"(VMW_BALLOON_HV_MAGIC),		\
-		"1"(VMW_BALLOON_CMD_##cmd),		\
-		"2"(VMW_BALLOON_HV_PORT),		\
-		"3"(data) :				\
-		"memory");				\
-	result &= -1UL;					\
-	__stat & -1UL;					\
-})
-
-#ifdef CONFIG_DEBUG_FS
-struct vmballoon_stats {
-	unsigned int timer;
-
-	/* allocation statustics */
-	unsigned int alloc;
-	unsigned int alloc_fail;
-	unsigned int sleep_alloc;
-	unsigned int sleep_alloc_fail;
-	unsigned int refused_alloc;
-	unsigned int refused_free;
-	unsigned int free;
-
-	/* monitor operations */
-	unsigned int lock;
-	unsigned int lock_fail;
-	unsigned int unlock;
-	unsigned int unlock_fail;
-	unsigned int target;
-	unsigned int target_fail;
-	unsigned int start;
-	unsigned int start_fail;
-	unsigned int guest_type;
-	unsigned int guest_type_fail;
-};
-
-#define STATS_INC(stat) (stat)++
-#else
-#define STATS_INC(stat)
-#endif
-
-struct vmballoon {
-
-	/* list of reserved physical pages */
-	struct list_head pages;
-
-	/* transient list of non-balloonable pages */
-	struct list_head refused_pages;
-	unsigned int n_refused_pages;
-
-	/* balloon size in pages */
-	unsigned int size;
-	unsigned int target;
-
-	/* reset flag */
-	bool reset_required;
-
-	/* adjustment rates (pages per second) */
-	unsigned int rate_alloc;
-	unsigned int rate_free;
-
-	/* slowdown page allocations for next few cycles */
-	unsigned int slow_allocation_cycles;
-
-#ifdef CONFIG_DEBUG_FS
-	/* statistics */
-	struct vmballoon_stats stats;
-
-	/* debugfs file exporting statistics */
-	struct dentry *dbg_entry;
-#endif
-
-	struct sysinfo sysinfo;
-
-	struct delayed_work dwork;
-};
-
-static struct vmballoon balloon;
-static struct workqueue_struct *vmballoon_wq;
-
-/*
- * Send "start" command to the host, communicating supported version
- * of the protocol.
- */
-static bool vmballoon_send_start(struct vmballoon *b)
-{
-	unsigned long status, dummy;
-
-	STATS_INC(b->stats.start);
-
-	status = VMWARE_BALLOON_CMD(START, VMW_BALLOON_PROTOCOL_VERSION, dummy);
-	if (status == VMW_BALLOON_SUCCESS)
-		return true;
-
-	pr_debug("%s - failed, hv returns %ld\n", __func__, status);
-	STATS_INC(b->stats.start_fail);
-	return false;
-}
-
-static bool vmballoon_check_status(struct vmballoon *b, unsigned long status)
-{
-	switch (status) {
-	case VMW_BALLOON_SUCCESS:
-		return true;
-
-	case VMW_BALLOON_ERROR_RESET:
-		b->reset_required = true;
-		/* fall through */
-
-	default:
-		return false;
-	}
-}
-
-/*
- * Communicate guest type to the host so that it can adjust ballooning
- * algorithm to the one most appropriate for the guest. This command
- * is normally issued after sending "start" command and is part of
- * standard reset sequence.
- */
-static bool vmballoon_send_guest_id(struct vmballoon *b)
-{
-	unsigned long status, dummy;
-
-	status = VMWARE_BALLOON_CMD(GUEST_ID, VMW_BALLOON_GUEST_ID, dummy);
-
-	STATS_INC(b->stats.guest_type);
-
-	if (vmballoon_check_status(b, status))
-		return true;
-
-	pr_debug("%s - failed, hv returns %ld\n", __func__, status);
-	STATS_INC(b->stats.guest_type_fail);
-	return false;
-}
-
-/*
- * Retrieve desired balloon size from the host.
- */
-static bool vmballoon_send_get_target(struct vmballoon *b, u32 *new_target)
-{
-	unsigned long status;
-	unsigned long target;
-	unsigned long limit;
-	u32 limit32;
-
-	/*
-	 * si_meminfo() is cheap. Moreover, we want to provide dynamic
-	 * max balloon size later. So let us call si_meminfo() every
-	 * iteration.
-	 */
-	si_meminfo(&b->sysinfo);
-	limit = b->sysinfo.totalram;
-
-	/* Ensure limit fits in 32-bits */
-	limit32 = (u32)limit;
-	if (limit != limit32)
-		return false;
-
-	/* update stats */
-	STATS_INC(b->stats.target);
-
-	status = VMWARE_BALLOON_CMD(GET_TARGET, limit, target);
-	if (vmballoon_check_status(b, status)) {
-		*new_target = target;
-		return true;
-	}
-
-	pr_debug("%s - failed, hv returns %ld\n", __func__, status);
-	STATS_INC(b->stats.target_fail);
-	return false;
-}
-
-/*
- * Notify the host about allocated page so that host can use it without
- * fear that guest will need it. Host may reject some pages, we need to
- * check the return value and maybe submit a different page.
- */
-static bool vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn)
-{
-	unsigned long status, dummy;
-	u32 pfn32;
-
-	pfn32 = (u32)pfn;
-	if (pfn32 != pfn)
-		return false;
-
-	STATS_INC(b->stats.lock);
-
-	status = VMWARE_BALLOON_CMD(LOCK, pfn, dummy);
-	if (vmballoon_check_status(b, status))
-		return true;
-
-	pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status);
-	STATS_INC(b->stats.lock_fail);
-	return false;
-}
-
-/*
- * Notify the host that guest intends to release given page back into
- * the pool of available (to the guest) pages.
- */
-static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn)
-{
-	unsigned long status, dummy;
-	u32 pfn32;
-
-	pfn32 = (u32)pfn;
-	if (pfn32 != pfn)
-		return false;
-
-	STATS_INC(b->stats.unlock);
-
-	status = VMWARE_BALLOON_CMD(UNLOCK, pfn, dummy);
-	if (vmballoon_check_status(b, status))
-		return true;
-
-	pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status);
-	STATS_INC(b->stats.unlock_fail);
-	return false;
-}
-
-/*
- * Quickly release all pages allocated for the balloon. This function is
- * called when host decides to "reset" balloon for one reason or another.
- * Unlike normal "deflate" we do not (shall not) notify host of the pages
- * being released.
- */
-static void vmballoon_pop(struct vmballoon *b)
-{
-	struct page *page, *next;
-	unsigned int count = 0;
-
-	list_for_each_entry_safe(page, next, &b->pages, lru) {
-		list_del(&page->lru);
-		__free_page(page);
-		STATS_INC(b->stats.free);
-		b->size--;
-
-		if (++count >= b->rate_free) {
-			count = 0;
-			cond_resched();
-		}
-	}
-}
-
-/*
- * Perform standard reset sequence by popping the balloon (in case it
- * is not  empty) and then restarting protocol. This operation normally
- * happens when host responds with VMW_BALLOON_ERROR_RESET to a command.
- */
-static void vmballoon_reset(struct vmballoon *b)
-{
-	/* free all pages, skipping monitor unlock */
-	vmballoon_pop(b);
-
-	if (vmballoon_send_start(b)) {
-		b->reset_required = false;
-		if (!vmballoon_send_guest_id(b))
-			pr_err("failed to send guest ID to the host\n");
-	}
-}
-
-/*
- * Allocate (or reserve) a page for the balloon and notify the host.  If host
- * refuses the page put it on "refuse" list and allocate another one until host
- * is satisfied. "Refused" pages are released at the end of inflation cycle
- * (when we allocate b->rate_alloc pages).
- */
-static int vmballoon_reserve_page(struct vmballoon *b, bool can_sleep)
-{
-	struct page *page;
-	gfp_t flags;
-	bool locked = false;
-
-	do {
-		if (!can_sleep)
-			STATS_INC(b->stats.alloc);
-		else
-			STATS_INC(b->stats.sleep_alloc);
-
-		flags = can_sleep ? VMW_PAGE_ALLOC_CANSLEEP : VMW_PAGE_ALLOC_NOSLEEP;
-		page = alloc_page(flags);
-		if (!page) {
-			if (!can_sleep)
-				STATS_INC(b->stats.alloc_fail);
-			else
-				STATS_INC(b->stats.sleep_alloc_fail);
-			return -ENOMEM;
-		}
-
-		/* inform monitor */
-		locked = vmballoon_send_lock_page(b, page_to_pfn(page));
-		if (!locked) {
-			STATS_INC(b->stats.refused_alloc);
-
-			if (b->reset_required) {
-				__free_page(page);
-				return -EIO;
-			}
-
-			/*
-			 * Place page on the list of non-balloonable pages
-			 * and retry allocation, unless we already accumulated
-			 * too many of them, in which case take a breather.
-			 */
-			list_add(&page->lru, &b->refused_pages);
-			if (++b->n_refused_pages >= VMW_BALLOON_MAX_REFUSED)
-				return -EIO;
-		}
-	} while (!locked);
-
-	/* track allocated page */
-	list_add(&page->lru, &b->pages);
-
-	/* update balloon size */
-	b->size++;
-
-	return 0;
-}
-
-/*
- * Release the page allocated for the balloon. Note that we first notify
- * the host so it can make sure the page will be available for the guest
- * to use, if needed.
- */
-static int vmballoon_release_page(struct vmballoon *b, struct page *page)
-{
-	if (!vmballoon_send_unlock_page(b, page_to_pfn(page)))
-		return -EIO;
-
-	list_del(&page->lru);
-
-	/* deallocate page */
-	__free_page(page);
-	STATS_INC(b->stats.free);
-
-	/* update balloon size */
-	b->size--;
-
-	return 0;
-}
-
-/*
- * Release pages that were allocated while attempting to inflate the
- * balloon but were refused by the host for one reason or another.
- */
-static void vmballoon_release_refused_pages(struct vmballoon *b)
-{
-	struct page *page, *next;
-
-	list_for_each_entry_safe(page, next, &b->refused_pages, lru) {
-		list_del(&page->lru);
-		__free_page(page);
-		STATS_INC(b->stats.refused_free);
-	}
-
-	b->n_refused_pages = 0;
-}
-
-/*
- * Inflate the balloon towards its target size. Note that we try to limit
- * the rate of allocation to make sure we are not choking the rest of the
- * system.
- */
-static void vmballoon_inflate(struct vmballoon *b)
-{
-	unsigned int goal;
-	unsigned int rate;
-	unsigned int i;
-	unsigned int allocations = 0;
-	int error = 0;
-	bool alloc_can_sleep = false;
-
-	pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target);
-
-	/*
-	 * First try NOSLEEP page allocations to inflate balloon.
-	 *
-	 * If we do not throttle nosleep allocations, we can drain all
-	 * free pages in the guest quickly (if the balloon target is high).
-	 * As a side-effect, draining free pages helps to inform (force)
-	 * the guest to start swapping if balloon target is not met yet,
-	 * which is a desired behavior. However, balloon driver can consume
-	 * all available CPU cycles if too many pages are allocated in a
-	 * second. Therefore, we throttle nosleep allocations even when
-	 * the guest is not under memory pressure. OTOH, if we have already
-	 * predicted that the guest is under memory pressure, then we
-	 * slowdown page allocations considerably.
-	 */
-
-	goal = b->target - b->size;
-	/*
-	 * Start with no sleep allocation rate which may be higher
-	 * than sleeping allocation rate.
-	 */
-	rate = b->slow_allocation_cycles ?
-			b->rate_alloc : VMW_BALLOON_NOSLEEP_ALLOC_MAX;
-
-	pr_debug("%s - goal: %d, no-sleep rate: %d, sleep rate: %d\n",
-		 __func__, goal, rate, b->rate_alloc);
-
-	for (i = 0; i < goal; i++) {
-
-		error = vmballoon_reserve_page(b, alloc_can_sleep);
-		if (error) {
-			if (error != -ENOMEM) {
-				/*
-				 * Not a page allocation failure, stop this
-				 * cycle. Maybe we'll get new target from
-				 * the host soon.
-				 */
-				break;
-			}
-
-			if (alloc_can_sleep) {
-				/*
-				 * CANSLEEP page allocation failed, so guest
-				 * is under severe memory pressure. Quickly
-				 * decrease allocation rate.
-				 */
-				b->rate_alloc = max(b->rate_alloc / 2,
-						    VMW_BALLOON_RATE_ALLOC_MIN);
-				break;
-			}
-
-			/*
-			 * NOSLEEP page allocation failed, so the guest is
-			 * under memory pressure. Let us slow down page
-			 * allocations for next few cycles so that the guest
-			 * gets out of memory pressure. Also, if we already
-			 * allocated b->rate_alloc pages, let's pause,
-			 * otherwise switch to sleeping allocations.
-			 */
-			b->slow_allocation_cycles = VMW_BALLOON_SLOW_CYCLES;
-
-			if (i >= b->rate_alloc)
-				break;
-
-			alloc_can_sleep = true;
-			/* Lower rate for sleeping allocations. */
-			rate = b->rate_alloc;
-		}
-
-		if (++allocations > VMW_BALLOON_YIELD_THRESHOLD) {
-			cond_resched();
-			allocations = 0;
-		}
-
-		if (i >= rate) {
-			/* We allocated enough pages, let's take a break. */
-			break;
-		}
-	}
-
-	/*
-	 * We reached our goal without failures so try increasing
-	 * allocation rate.
-	 */
-	if (error == 0 && i >= b->rate_alloc) {
-		unsigned int mult = i / b->rate_alloc;
-
-		b->rate_alloc =
-			min(b->rate_alloc + mult * VMW_BALLOON_RATE_ALLOC_INC,
-			    VMW_BALLOON_RATE_ALLOC_MAX);
-	}
-
-	vmballoon_release_refused_pages(b);
-}
-
-/*
- * Decrease the size of the balloon allowing guest to use more memory.
- */
-static void vmballoon_deflate(struct vmballoon *b)
-{
-	struct page *page, *next;
-	unsigned int i = 0;
-	unsigned int goal;
-	int error;
-
-	pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target);
-
-	/* limit deallocation rate */
-	goal = min(b->size - b->target, b->rate_free);
-
-	pr_debug("%s - goal: %d, rate: %d\n", __func__, goal, b->rate_free);
-
-	/* free pages to reach target */
-	list_for_each_entry_safe(page, next, &b->pages, lru) {
-		error = vmballoon_release_page(b, page);
-		if (error) {
-			/* quickly decrease rate in case of error */
-			b->rate_free = max(b->rate_free / 2,
-					   VMW_BALLOON_RATE_FREE_MIN);
-			return;
-		}
-
-		if (++i >= goal)
-			break;
-	}
-
-	/* slowly increase rate if there were no errors */
-	b->rate_free = min(b->rate_free + VMW_BALLOON_RATE_FREE_INC,
-			   VMW_BALLOON_RATE_FREE_MAX);
-}
-
-/*
- * Balloon work function: reset protocol, if needed, get the new size and
- * adjust balloon as needed. Repeat in 1 sec.
- */
-static void vmballoon_work(struct work_struct *work)
-{
-	struct delayed_work *dwork = to_delayed_work(work);
-	struct vmballoon *b = container_of(dwork, struct vmballoon, dwork);
-	unsigned int target;
-
-	STATS_INC(b->stats.timer);
-
-	if (b->reset_required)
-		vmballoon_reset(b);
-
-	if (b->slow_allocation_cycles > 0)
-		b->slow_allocation_cycles--;
-
-	if (vmballoon_send_get_target(b, &target)) {
-		/* update target, adjust size */
-		b->target = target;
-
-		if (b->size < target)
-			vmballoon_inflate(b);
-		else if (b->size > target)
-			vmballoon_deflate(b);
-	}
-
-	queue_delayed_work(vmballoon_wq, dwork, round_jiffies_relative(HZ));
-}
-
-/*
- * DEBUGFS Interface
- */
-#ifdef CONFIG_DEBUG_FS
-
-static int vmballoon_debug_show(struct seq_file *f, void *offset)
-{
-	struct vmballoon *b = f->private;
-	struct vmballoon_stats *stats = &b->stats;
-
-	/* format size info */
-	seq_printf(f,
-		   "target:             %8d pages\n"
-		   "current:            %8d pages\n",
-		   b->target, b->size);
-
-	/* format rate info */
-	seq_printf(f,
-		   "rateNoSleepAlloc:   %8d pages/sec\n"
-		   "rateSleepAlloc:     %8d pages/sec\n"
-		   "rateFree:           %8d pages/sec\n",
-		   VMW_BALLOON_NOSLEEP_ALLOC_MAX,
-		   b->rate_alloc, b->rate_free);
-
-	seq_printf(f,
-		   "\n"
-		   "timer:              %8u\n"
-		   "start:              %8u (%4u failed)\n"
-		   "guestType:          %8u (%4u failed)\n"
-		   "lock:               %8u (%4u failed)\n"
-		   "unlock:             %8u (%4u failed)\n"
-		   "target:             %8u (%4u failed)\n"
-		   "primNoSleepAlloc:   %8u (%4u failed)\n"
-		   "primCanSleepAlloc:  %8u (%4u failed)\n"
-		   "primFree:           %8u\n"
-		   "errAlloc:           %8u\n"
-		   "errFree:            %8u\n",
-		   stats->timer,
-		   stats->start, stats->start_fail,
-		   stats->guest_type, stats->guest_type_fail,
-		   stats->lock,  stats->lock_fail,
-		   stats->unlock, stats->unlock_fail,
-		   stats->target, stats->target_fail,
-		   stats->alloc, stats->alloc_fail,
-		   stats->sleep_alloc, stats->sleep_alloc_fail,
-		   stats->free,
-		   stats->refused_alloc, stats->refused_free);
-
-	return 0;
-}
-
-static int vmballoon_debug_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, vmballoon_debug_show, inode->i_private);
-}
-
-static const struct file_operations vmballoon_debug_fops = {
-	.owner		= THIS_MODULE,
-	.open		= vmballoon_debug_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
-static int __init vmballoon_debugfs_init(struct vmballoon *b)
-{
-	int error;
-
-	b->dbg_entry = debugfs_create_file("vmmemctl", S_IRUGO, NULL, b,
-					   &vmballoon_debug_fops);
-	if (IS_ERR(b->dbg_entry)) {
-		error = PTR_ERR(b->dbg_entry);
-		pr_err("failed to create debugfs entry, error: %d\n", error);
-		return error;
-	}
-
-	return 0;
-}
-
-static void __exit vmballoon_debugfs_exit(struct vmballoon *b)
-{
-	debugfs_remove(b->dbg_entry);
-}
-
-#else
-
-static inline int vmballoon_debugfs_init(struct vmballoon *b)
-{
-	return 0;
-}
-
-static inline void vmballoon_debugfs_exit(struct vmballoon *b)
-{
-}
-
-#endif	/* CONFIG_DEBUG_FS */
-
-static int __init vmballoon_init(void)
-{
-	int error;
-
-	/*
-	 * Check if we are running on VMware's hypervisor and bail out
-	 * if we are not.
-	 */
-	if (x86_hyper != &x86_hyper_vmware)
-		return -ENODEV;
-
-	vmballoon_wq = create_freezeable_workqueue("vmmemctl");
-	if (!vmballoon_wq) {
-		pr_err("failed to create workqueue\n");
-		return -ENOMEM;
-	}
-
-	INIT_LIST_HEAD(&balloon.pages);
-	INIT_LIST_HEAD(&balloon.refused_pages);
-
-	/* initialize rates */
-	balloon.rate_alloc = VMW_BALLOON_RATE_ALLOC_MAX;
-	balloon.rate_free = VMW_BALLOON_RATE_FREE_MAX;
-
-	INIT_DELAYED_WORK(&balloon.dwork, vmballoon_work);
-
-	/*
-	 * Start balloon.
-	 */
-	if (!vmballoon_send_start(&balloon)) {
-		pr_err("failed to send start command to the host\n");
-		error = -EIO;
-		goto fail;
-	}
-
-	if (!vmballoon_send_guest_id(&balloon)) {
-		pr_err("failed to send guest ID to the host\n");
-		error = -EIO;
-		goto fail;
-	}
-
-	error = vmballoon_debugfs_init(&balloon);
-	if (error)
-		goto fail;
-
-	queue_delayed_work(vmballoon_wq, &balloon.dwork, 0);
-
-	return 0;
-
-fail:
-	destroy_workqueue(vmballoon_wq);
-	return error;
-}
-module_init(vmballoon_init);
-
-static void __exit vmballoon_exit(void)
-{
-	cancel_delayed_work_sync(&balloon.dwork);
-	destroy_workqueue(vmballoon_wq);
-
-	vmballoon_debugfs_exit(&balloon);
-
-	/*
-	 * Deallocate all reserved memory, and reset connection with monitor.
-	 * Reset connection before deallocating memory to avoid potential for
-	 * additional spurious resets from guest touching deallocated pages.
-	 */
-	vmballoon_send_start(&balloon);
-	vmballoon_pop(&balloon);
-}
-module_exit(vmballoon_exit);