include/linux/balloon_compaction.h

5  * Common interface definitions for making balloon pages movable by compaction.
10  * page->private is used to reference the responsible balloon device.
16  * performing balloon page compaction. In order to sort out these racy scenarios
17  * and safely perform balloon's page compaction and migration we must, always,
20  *   i. when updating a balloon's page ->mapping element, strictly do it under
27  *  ii. isolation or dequeueing procedure must remove the page from balloon
31  * the aforementioned balloon page corner case, as well as to ensure the simple
32  * set of exposed rules are satisfied while we are dealing with balloon pages
49  * This struct is used to allow the common balloon compaction interface
50  * procedures to find the proper balloon device holding memory pages they'll
52  * balloon driver as a page book-keeper for its registered balloon devices.
71 static inline void balloon_devinfo_init(struct balloon_dev_info *balloon)
73 	balloon->isolated_pages = 0;
74 	spin_lock_init(&balloon->pages_lock);
75 	INIT_LIST_HEAD(&balloon->pages);
76 	balloon->migratepage = NULL;
83  * balloon_page_insert - insert a page into the balloon's page list and make
85  * @balloon : pointer to balloon device
86  * @page    : page to be assigned as a 'balloon page'
88  * Caller must ensure the page is locked and the spin_lock protecting balloon
89  * pages list is held before inserting a page into the balloon device.
91 static inline void balloon_page_insert(struct balloon_dev_info *balloon,
96 	set_page_private(page, (unsigned long)balloon);
97 	list_add(&page->lru, &balloon->pages);
101  * balloon_page_delete - delete a page from balloon's page list and clear
103  * @page    : page to be released from balloon's page list
105  * Caller must ensure the page is locked and the spin_lock protecting balloon
106  * pages list is held before deleting a page from the balloon device.
122  * balloon_page_device - get the b_dev_info descriptor for the balloon device
137 static inline void balloon_page_insert(struct balloon_dev_info *balloon,
141 	list_add(&page->lru, &balloon->pages);