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mm/balloon_compaction: remove balloon mapping and flag AS_BALLOON_MAP

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Now ballooned pages are detected using PageBalloon().  Fake mapping is no
longer required.  This patch links ballooned pages to balloon device using
field page->private instead of page->mapping.  Also this patch embeds
balloon_dev_info directly into struct virtio_balloon.

Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@samsung.com>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov
2014-10-09 15:29:29 -07:00
committed by Linus Torvalds
parent d6d86c0a7f
commit 9d1ba80564
4 changed files with 39 additions and 206 deletions
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95
mm/balloon_compaction.c
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@@ -10,32 +10,6 @@
#include <linux/export.h>
#include <linux/balloon_compaction.h>
/*
* balloon_devinfo_alloc - allocates a balloon device information descriptor.
* @balloon_dev_descriptor: pointer to reference the balloon device which
* this struct balloon_dev_info will be servicing.
*
* Driver must call it to properly allocate and initialize an instance of
* struct balloon_dev_info which will be used to reference a balloon device
* as well as to keep track of the balloon device page list.
*/
struct balloon_dev_info *balloon_devinfo_alloc(void *balloon_dev_descriptor)
{
struct balloon_dev_info *b_dev_info;
b_dev_info = kmalloc(sizeof(*b_dev_info), GFP_KERNEL);
if (!b_dev_info)
return ERR_PTR(-ENOMEM);
b_dev_info->balloon_device = balloon_dev_descriptor;
b_dev_info->mapping = NULL;
b_dev_info->isolated_pages = 0;
spin_lock_init(&b_dev_info->pages_lock);
INIT_LIST_HEAD(&b_dev_info->pages);
return b_dev_info;
}
EXPORT_SYMBOL_GPL(balloon_devinfo_alloc);
/*
* balloon_page_enqueue - allocates a new page and inserts it into the balloon
* page list.
@@ -61,7 +35,7 @@ struct page *balloon_page_enqueue(struct balloon_dev_info *b_dev_info)
*/
BUG_ON(!trylock_page(page));
spin_lock_irqsave(&b_dev_info->pages_lock, flags);
balloon_page_insert(page, b_dev_info->mapping, &b_dev_info->pages);
balloon_page_insert(b_dev_info, page);
spin_unlock_irqrestore(&b_dev_info->pages_lock, flags);
unlock_page(page);
return page;
@@ -127,60 +101,10 @@ struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info)
EXPORT_SYMBOL_GPL(balloon_page_dequeue);
#ifdef CONFIG_BALLOON_COMPACTION
/*
* balloon_mapping_alloc - allocates a special ->mapping for ballooned pages.
* @b_dev_info: holds the balloon device information descriptor.
* @a_ops: balloon_mapping address_space_operations descriptor.
*
* Driver must call it to properly allocate and initialize an instance of
* struct address_space which will be used as the special page->mapping for
* balloon device enlisted page instances.
*/
struct address_space *balloon_mapping_alloc(struct balloon_dev_info *b_dev_info,
const struct address_space_operations *a_ops)
{
struct address_space *mapping;
mapping = kmalloc(sizeof(*mapping), GFP_KERNEL);
if (!mapping)
return ERR_PTR(-ENOMEM);
/*
* Give a clean 'zeroed' status to all elements of this special
* balloon page->mapping struct address_space instance.
*/
address_space_init_once(mapping);
/*
* Set mapping->flags appropriately, to allow balloon pages
* ->mapping identification.
*/
mapping_set_balloon(mapping);
mapping_set_gfp_mask(mapping, balloon_mapping_gfp_mask());
/* balloon's page->mapping->a_ops callback descriptor */
mapping->a_ops = a_ops;
/*
* Establish a pointer reference back to the balloon device descriptor
* this particular page->mapping will be servicing.
* This is used by compaction / migration procedures to identify and
* access the balloon device pageset while isolating / migrating pages.
*
* As some balloon drivers can register multiple balloon devices
* for a single guest, this also helps compaction / migration to
* properly deal with multiple balloon pagesets, when required.
*/
mapping->private_data = b_dev_info;
b_dev_info->mapping = mapping;
return mapping;
}
EXPORT_SYMBOL_GPL(balloon_mapping_alloc);
static inline void __isolate_balloon_page(struct page *page)
{
struct balloon_dev_info *b_dev_info = page->mapping->private_data;
struct balloon_dev_info *b_dev_info = balloon_page_device(page);
unsigned long flags;
spin_lock_irqsave(&b_dev_info->pages_lock, flags);
@@ -192,7 +116,7 @@ static inline void __isolate_balloon_page(struct page *page)
static inline void __putback_balloon_page(struct page *page)
{
struct balloon_dev_info *b_dev_info = page->mapping->private_data;
struct balloon_dev_info *b_dev_info = balloon_page_device(page);
unsigned long flags;
spin_lock_irqsave(&b_dev_info->pages_lock, flags);
@@ -202,12 +126,6 @@ static inline void __putback_balloon_page(struct page *page)
spin_unlock_irqrestore(&b_dev_info->pages_lock, flags);
}
static inline int __migrate_balloon_page(struct address_space *mapping,
struct page *newpage, struct page *page, enum migrate_mode mode)
{
return page->mapping->a_ops->migratepage(mapping, newpage, page, mode);
}
/* __isolate_lru_page() counterpart for a ballooned page */
bool balloon_page_isolate(struct page *page)
{
@@ -274,7 +192,7 @@ void balloon_page_putback(struct page *page)
int balloon_page_migrate(struct page *newpage,
struct page *page, enum migrate_mode mode)
{
struct address_space *mapping;
struct balloon_dev_info *balloon = balloon_page_device(page);
int rc = -EAGAIN;
/*
@@ -290,9 +208,8 @@ int balloon_page_migrate(struct page *newpage,
return rc;
}
mapping = page->mapping;
if (mapping)
rc = __migrate_balloon_page(mapping, newpage, page, mode);
if (balloon && balloon->migratepage)
rc = balloon->migratepage(balloon, newpage, page, mode);
unlock_page(newpage);
return rc;