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93 lines
2.0 KiB
93 lines
2.0 KiB
#ifndef __LINUX_PAGE_EXT_H |
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#define __LINUX_PAGE_EXT_H |
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#include <linux/types.h> |
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#include <linux/stacktrace.h> |
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#include <linux/page_owner.h> |
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struct pglist_data; |
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struct page_ext_operations { |
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bool (*need)(void); |
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void (*init)(void); |
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}; |
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#ifdef CONFIG_PAGE_EXTENSION |
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/* |
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* page_ext->flags bits: |
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* |
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* PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to |
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* implement generic debug pagealloc feature. The pages are filled with |
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* poison patterns and set this flag after free_pages(). The poisoned |
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* pages are verified whether the patterns are not corrupted and clear |
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* the flag before alloc_pages(). |
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*/ |
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enum page_ext_flags { |
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PAGE_EXT_DEBUG_POISON, /* Page is poisoned */ |
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PAGE_EXT_DEBUG_GUARD, |
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PAGE_EXT_OWNER, |
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#if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT) |
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PAGE_EXT_YOUNG, |
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PAGE_EXT_IDLE, |
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#endif |
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}; |
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/* |
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* Page Extension can be considered as an extended mem_map. |
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* A page_ext page is associated with every page descriptor. The |
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* page_ext helps us add more information about the page. |
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* All page_ext are allocated at boot or memory hotplug event, |
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* then the page_ext for pfn always exists. |
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*/ |
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struct page_ext { |
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unsigned long flags; |
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#ifdef CONFIG_PAGE_OWNER |
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unsigned int order; |
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gfp_t gfp_mask; |
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#ifdef CONFIG_PAGE_OWNER_SLIM |
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BtEntry *entry; |
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#else |
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unsigned int nr_entries; |
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unsigned long trace_entries[8]; |
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#endif |
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#endif |
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}; |
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extern void pgdat_page_ext_init(struct pglist_data *pgdat); |
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#ifdef CONFIG_SPARSEMEM |
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static inline void page_ext_init_flatmem(void) |
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{ |
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} |
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extern void page_ext_init(void); |
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#else |
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extern void page_ext_init_flatmem(void); |
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static inline void page_ext_init(void) |
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{ |
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} |
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#endif |
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struct page_ext *lookup_page_ext(struct page *page); |
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#else /* !CONFIG_PAGE_EXTENSION */ |
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struct page_ext; |
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static inline void pgdat_page_ext_init(struct pglist_data *pgdat) |
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{ |
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} |
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static inline struct page_ext *lookup_page_ext(struct page *page) |
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{ |
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return NULL; |
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} |
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static inline void page_ext_init(void) |
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{ |
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} |
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static inline void page_ext_init_flatmem(void) |
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{ |
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} |
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#endif /* CONFIG_PAGE_EXTENSION */ |
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#endif /* __LINUX_PAGE_EXT_H */
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