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3e32cb2e JW |
1 | #ifndef _LINUX_PAGE_COUNTER_H |
2 | #define _LINUX_PAGE_COUNTER_H | |
3 | ||
4 | #include <linux/atomic.h> | |
5 | #include <linux/kernel.h> | |
6 | #include <asm/page.h> | |
7 | ||
8 | struct page_counter { | |
9 | atomic_long_t count; | |
10 | unsigned long limit; | |
11 | struct page_counter *parent; | |
12 | ||
13 | /* legacy */ | |
14 | unsigned long watermark; | |
15 | unsigned long failcnt; | |
16 | }; | |
17 | ||
18 | #if BITS_PER_LONG == 32 | |
19 | #define PAGE_COUNTER_MAX LONG_MAX | |
20 | #else | |
21 | #define PAGE_COUNTER_MAX (LONG_MAX / PAGE_SIZE) | |
22 | #endif | |
23 | ||
24 | static inline void page_counter_init(struct page_counter *counter, | |
25 | struct page_counter *parent) | |
26 | { | |
27 | atomic_long_set(&counter->count, 0); | |
28 | counter->limit = PAGE_COUNTER_MAX; | |
29 | counter->parent = parent; | |
30 | } | |
31 | ||
32 | static inline unsigned long page_counter_read(struct page_counter *counter) | |
33 | { | |
34 | return atomic_long_read(&counter->count); | |
35 | } | |
36 | ||
64f21993 | 37 | void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages); |
3e32cb2e JW |
38 | void page_counter_charge(struct page_counter *counter, unsigned long nr_pages); |
39 | int page_counter_try_charge(struct page_counter *counter, | |
40 | unsigned long nr_pages, | |
41 | struct page_counter **fail); | |
64f21993 | 42 | void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages); |
3e32cb2e | 43 | int page_counter_limit(struct page_counter *counter, unsigned long limit); |
650c5e56 JW |
44 | int page_counter_memparse(const char *buf, const char *max, |
45 | unsigned long *nr_pages); | |
3e32cb2e JW |
46 | |
47 | static inline void page_counter_reset_watermark(struct page_counter *counter) | |
48 | { | |
49 | counter->watermark = page_counter_read(counter); | |
50 | } | |
51 | ||
52 | #endif /* _LINUX_PAGE_COUNTER_H */ |