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include/linux/page_idle.h 2.58 KB
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33c3fc71c   Vladimir Davydov   mm: introduce idl... 
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  #ifndef _LINUX_MM_PAGE_IDLE_H
  #define _LINUX_MM_PAGE_IDLE_H
  
  #include <linux/bitops.h>
  #include <linux/page-flags.h>
  #include <linux/page_ext.h>
  
  #ifdef CONFIG_IDLE_PAGE_TRACKING
  
  #ifdef CONFIG_64BIT
  static inline bool page_is_young(struct page *page)
  {
  	return PageYoung(page);
  }
  
  static inline void set_page_young(struct page *page)
  {
  	SetPageYoung(page);
  }
  
  static inline bool test_and_clear_page_young(struct page *page)
  {
  	return TestClearPageYoung(page);
  }
  
  static inline bool page_is_idle(struct page *page)
  {
  	return PageIdle(page);
  }
  
  static inline void set_page_idle(struct page *page)
  {
  	SetPageIdle(page);
  }
  
  static inline void clear_page_idle(struct page *page)
  {
  	ClearPageIdle(page);
  }
  #else /* !CONFIG_64BIT */
  /*
   * If there is not enough space to store Idle and Young bits in page flags, use
   * page ext flags instead.
   */
  extern struct page_ext_operations page_idle_ops;
  
  static inline bool page_is_young(struct page *page)
  {
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  	struct page_ext *page_ext = lookup_page_ext(page);
  
  	if (unlikely(!page_ext))
  		return false;
  
  	return test_bit(PAGE_EXT_YOUNG, &page_ext->flags);
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  }
  
  static inline void set_page_young(struct page *page)
  {
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  	struct page_ext *page_ext = lookup_page_ext(page);
  
  	if (unlikely(!page_ext))
  		return;
  
  	set_bit(PAGE_EXT_YOUNG, &page_ext->flags);
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  }
  
  static inline bool test_and_clear_page_young(struct page *page)
  {
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  	struct page_ext *page_ext = lookup_page_ext(page);
  
  	if (unlikely(!page_ext))
  		return false;
  
  	return test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags);
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  }
  
  static inline bool page_is_idle(struct page *page)
  {
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  	struct page_ext *page_ext = lookup_page_ext(page);
  
  	if (unlikely(!page_ext))
  		return false;
  
  	return test_bit(PAGE_EXT_IDLE, &page_ext->flags);
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  }
  
  static inline void set_page_idle(struct page *page)
  {
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  	struct page_ext *page_ext = lookup_page_ext(page);
  
  	if (unlikely(!page_ext))
  		return;
  
  	set_bit(PAGE_EXT_IDLE, &page_ext->flags);
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  }
  
  static inline void clear_page_idle(struct page *page)
  {
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  	struct page_ext *page_ext = lookup_page_ext(page);
  
  	if (unlikely(!page_ext))
  		return;
  
  	clear_bit(PAGE_EXT_IDLE, &page_ext->flags);
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  }
  #endif /* CONFIG_64BIT */
  
  #else /* !CONFIG_IDLE_PAGE_TRACKING */
  
  static inline bool page_is_young(struct page *page)
  {
  	return false;
  }
  
  static inline void set_page_young(struct page *page)
  {
  }
  
  static inline bool test_and_clear_page_young(struct page *page)
  {
  	return false;
  }
  
  static inline bool page_is_idle(struct page *page)
  {
  	return false;
  }
  
  static inline void set_page_idle(struct page *page)
  {
  }
  
  static inline void clear_page_idle(struct page *page)
  {
  }
  
  #endif /* CONFIG_IDLE_PAGE_TRACKING */
  
  #endif /* _LINUX_MM_PAGE_IDLE_H */