LXR linux/include/linux/page

   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
  11static inline bool page_is_young(struct page *page)
  12{
  13        return PageYoung(page);
  14}
  15
  16static inline void set_page_young(struct page *page)
  17{
  18        SetPageYoung(page);
  19}
  20
  21static inline bool test_and_clear_page_young(struct page *page)
  22{
  23        return TestClearPageYoung(page);
  24}
  25
  26static inline bool page_is_idle(struct page *page)
  27{
  28        return PageIdle(page);
  29}
  30
  31static inline void set_page_idle(struct page *page)
  32{
  33        SetPageIdle(page);
  34}
  35
  36static 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 */
  45extern struct page_ext_operations page_idle_ops;
  46
  47static inline bool page_is_young(struct page *page)
  48{
  49        return test_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
  50}
  51
  52static inline void set_page_young(struct page *page)
  53{
  54        set_bit(PAGE_EXT_YOUNG, &lookup_page_ext(page)->flags);
  55}
  56
  57static 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
  63static inline bool page_is_idle(struct page *page)
  64{
  65        return test_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
  66}
  67
  68static inline void set_page_idle(struct page *page)
  69{
  70        set_bit(PAGE_EXT_IDLE, &lookup_page_ext(page)->flags);
  71}
  72
  73static 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
  81static inline bool page_is_young(struct page *page)
  82{
  83        return false;
  84}
  85
  86static inline void set_page_young(struct page *page)
  87{
  88}
  89
  90static inline bool test_and_clear_page_young(struct page *page)
  91{
  92        return false;
  93}
  94
  95static inline bool page_is_idle(struct page *page)
  96{
  97        return false;
  98}
  99
 100static inline void set_page_idle(struct page *page)
 101{
 102}
 103
 104static 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 */
 111