projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| eefa864b JK |
1 | #ifndef __LINUX_PAGE_EXT_H |
| 2 | #define __LINUX_PAGE_EXT_H | |
| 3 | ||
| 48c96a36 JK |
4 | #include <linux/types.h> |
| 5 | #include <linux/stacktrace.h> | |
| 6 | ||
| eefa864b JK |
7 | struct pglist_data; |
| 8 | struct page_ext_operations { | |
| 9 | bool (*need)(void); | |
| 10 | void (*init)(void); | |
| 11 | }; | |
| 12 | ||
| 13 | #ifdef CONFIG_PAGE_EXTENSION | |
| 14 | ||
| e30825f1 JK |
15 | /* |
| 16 | * page_ext->flags bits: | |
| 17 | * | |
| 18 | * PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to | |
| 19 | * implement generic debug pagealloc feature. The pages are filled with | |
| 20 | * poison patterns and set this flag after free_pages(). The poisoned | |
| 21 | * pages are verified whether the patterns are not corrupted and clear | |
| 22 | * the flag before alloc_pages(). | |
| 23 | */ | |
| 24 | ||
| 25 | enum page_ext_flags { | |
| 26 | PAGE_EXT_DEBUG_POISON, /* Page is poisoned */ | |
| 27 | PAGE_EXT_DEBUG_GUARD, | |
| 48c96a36 | 28 | PAGE_EXT_OWNER, |
| 33c3fc71 VD |
29 | #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT) |
| 30 | PAGE_EXT_YOUNG, | |
| 31 | PAGE_EXT_IDLE, | |
| 32 | #endif | |
| e30825f1 JK |
33 | }; |
| 34 | ||
| eefa864b JK |
35 | /* |
| 36 | * Page Extension can be considered as an extended mem_map. | |
| 37 | * A page_ext page is associated with every page descriptor. The | |
| 38 | * page_ext helps us add more information about the page. | |
| 39 | * All page_ext are allocated at boot or memory hotplug event, | |
| 40 | * then the page_ext for pfn always exists. | |
| 41 | */ | |
| 42 | struct page_ext { | |
| 43 | unsigned long flags; | |
| 48c96a36 JK |
44 | #ifdef CONFIG_PAGE_OWNER |
| 45 | unsigned int order; | |
| 46 | gfp_t gfp_mask; | |
| 94f759d6 | 47 | unsigned int nr_entries; |
| 7cd12b4a | 48 | int last_migrate_reason; |
| 48c96a36 JK |
49 | unsigned long trace_entries[8]; |
| 50 | #endif | |
| eefa864b JK |
51 | }; |
| 52 | ||
| 53 | extern void pgdat_page_ext_init(struct pglist_data *pgdat); | |
| 54 | ||
| 55 | #ifdef CONFIG_SPARSEMEM | |
| 56 | static inline void page_ext_init_flatmem(void) | |
| 57 | { | |
| 58 | } | |
| 59 | extern void page_ext_init(void); | |
| 60 | #else | |
| 61 | extern void page_ext_init_flatmem(void); | |
| 62 | static inline void page_ext_init(void) | |
| 63 | { | |
| 64 | } | |
| 65 | #endif | |
| 66 | ||
| 67 | struct page_ext *lookup_page_ext(struct page *page); | |
| 68 | ||
| 69 | #else /* !CONFIG_PAGE_EXTENSION */ | |
| 70 | struct page_ext; | |
| 71 | ||
| 72 | static inline void pgdat_page_ext_init(struct pglist_data *pgdat) | |
| 73 | { | |
| 74 | } | |
| 75 | ||
| 76 | static inline struct page_ext *lookup_page_ext(struct page *page) | |
| 77 | { | |
| 78 | return NULL; | |
| 79 | } | |
| 80 | ||
| 81 | static inline void page_ext_init(void) | |
| 82 | { | |
| 83 | } | |
| 84 | ||
| 85 | static inline void page_ext_init_flatmem(void) | |
| 86 | { | |
| 87 | } | |
| 88 | #endif /* CONFIG_PAGE_EXTENSION */ | |
| 89 | #endif /* __LINUX_PAGE_EXT_H */ |