include/linux/page_idle.h

   1 #ifndef _LINUX_MM_PAGE_IDLE_H
   2 #define _LINUX_MM_PAGE_IDLE_H
   3
   4 #include <linux/bitops.h>
   5 #include <linux/page-flags.h>
   6 #include <linux/page_ext.h>
   7
   8 #ifdef CONFIG_IDLE_PAGE_TRACKING
   9
  10 #ifdef CONFIG_64BIT
  11 static inline bool page_is_young(struct page *page)
  12 {
  13         return PageYoung(page);
  14 }
  15
  16 static inline void set_page_young(struct page *page)
  17 {
  18         SetPageYoung(page);
  19 }
  20
  21 static inline bool test_and_clear_page_young(struct page *page)
  22 {
  23         return TestClearPageYoung(page);
  24 }
  25
  26 static inline bool page_is_idle(struct page *page)
  27 {
  28         return PageIdle(page);
  29 }
  30
  31 static inline void set_page_idle(struct page *page)
  32 {
  33         SetPageIdle(page);
  34 }
  35
  36 static inline void clear_page_idle(struct page *page)
  37 {
  38         ClearPageIdle(page);
  39 }
  40 #else /* !CONFIG_64BIT */
  41 /*
  42  * If there is not enough space to store Idle and Young bits in page flags, use
  43  * page ext flags instead.
  44  */
  45 extern struct page_ext_operations page_idle_ops;
  46
  47 static inline bool page_is_young(struct page *page)
  48 {
  49         return test_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
  50 }
  51
  52 static inline void set_page_young(struct page *page)
  53 {
  54         set_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
  55 }
  56
  57 static inline bool test_and_clear_page_young(struct page *page)
  58 {
  59         return test_and_clear_bit(PAGE_EXT_YOUNG,
  60                                   &lookup_page_ext(page)->flags);
  61 }
  62
  63 static inline bool page_is_idle(struct page *page)
  64 {
  65         return test_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
  66 }
  67
  68 static inline void set_page_idle(struct page *page)
  69 {
  70         set_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
  71 }
  72
  73 static inline void clear_page_idle(struct page *page)
  74 {
  75         clear_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
  76 }
  77 #endif /* CONFIG_64BIT */
  78
  79 #else /* !CONFIG_IDLE_PAGE_TRACKING */
  80
  81 static inline bool page_is_young(struct page *page)
  82 {
  83         return false;
  84 }
  85
  86 static inline void set_page_young(struct page *page)
  87 {
  88 }
  89
  90 static inline bool test_and_clear_page_young(struct page *page)
  91 {
  92         return false;
  93 }
  94
  95 static inline bool page_is_idle(struct page *page)
  96 {
  97         return false;
  98 }
  99
 100 static inline void set_page_idle(struct page *page)
 101 {
 102 }
 103
 104 static inline void clear_page_idle(struct page *page)
 105 {
 106 }
 107
 108 #endif /* CONFIG_IDLE_PAGE_TRACKING */
 109
 110 #endif /* _LINUX_MM_PAGE_IDLE_H */