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