input:b0003v0627p0001e0001-e0,1,2,3,4,k110,111,112,113,114,r8,B,a0,1,m4,lsfw žFile not found.  p,¾/* SPDX-License-Identifier: GPL-2.0 */ /* * include/linux/balloon_compaction.h * * Common interface definitions for making balloon pages movable by compaction. * * Balloon page migration makes use of the general non-lru movable page * feature. * * page->private is used to reference the responsible balloon device. * page->mapping is used in context of non-lru page migration to reference * the address space operations for page isolation/migration/compaction. * * As the page isolation scanning step a compaction thread does is a lockless * procedure (from a page standpoint), it might bring some racy situations while * performing balloon page compaction. In order to sort out these racy scenarios * and safely perform balloon's page compaction and migration we must, always, * ensure following these simple rules: * * i. when updating a balloon's page ->mapping element, strictly do it under * the following lock order, independently of the far superior * locking scheme (lru_lock, balloon_lock): * +-page_lock(page); * +--spin_lock_irq(&b_dev_info->pages_lock); * ... page->mapping updates here ... * * ii. isolation or dequeueing procedure must remove the page from balloon * device page list under b_dev_info->pages_lock. * * The functions provided by this interface are placed to help on coping with * the aforementioned balloon page corner case, as well as to ensure the simple * set of exposed rules are satisfied while we are dealing with balloon pages * compaction / migration. * * Copyright (C) 2012, Red Hat, Inc. Rafael Aquini */ #ifndef _LINUX_BALLOON_COMPACTION_H #define _LINUX_BALLOON_COMPACTION_H #include #include #include #include #include #include #include /* * Balloon device information descriptor. * This struct is used to allow the common balloon compaction interface * procedures to find the proper balloon device holding memory pages they'll * have to cope for page compaction / migration, as well as it serves the * balloon driver as a page book-keeper for its registered balloon devices. */ struct balloon_dev_info { unsigned long isolated_pages; /* # of isolated pages for migration */ spinlock_t pages_lock; /* Protection to pages list */ struct list_head pages; /* Pages enqueued & handled to Host */ int (*migratepage)(struct balloon_dev_info *, struct page *newpage, struct page *page, enum migrate_mode mode); }; extern struct page *balloon_page_alloc(void); extern void balloon_page_enqueue(struct balloon_dev_info *b_dev_info, struct page *page); extern struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info); extern size_t balloon_page_list_enqueue(struct balloon_dev_info *b_dev_info, struct list_head *pages); extern size_t balloon_page_list_dequeue(struct balloon_dev_info *b_dev_info, struct list_head *pages, size_t n_req_pages); static inline void balloon_devinfo_init(struct balloon_dev_info *balloon) { balloon->isolated_pages = 0; spin_lock_init(&balloon->pages_lock); INIT_LIST_HEAD(&balloon->pages); balloon->migratepage = NULL; } #ifdef CONFIG_BALLOON_COMPACTION extern const struct movable_operations balloon_mops; /* * balloon_page_insert - insert a page into the balloon's page list and make * the page->private assignment accordingly. * @balloon : pointer to balloon device * @page : page to be assigned as a 'balloon page' * * Caller must ensure the page is locked and the spin_lock protecting balloon * pages list is held before inserting a page into the balloon device. */ static inline void balloon_page_insert(struct balloon_dev_info *balloon, struct page *page) { __SetPageOffline(page); __SetPageMovable(page, &balloon_mops); set_page_private(page, (unsigned long)balloon); list_add(&page