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52 lines
1.4 KiB
52 lines
1.4 KiB
#ifndef _LINUX_PAGE_COUNTER_H |
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#define _LINUX_PAGE_COUNTER_H |
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#include <linux/atomic.h> |
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#include <linux/kernel.h> |
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#include <asm/page.h> |
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struct page_counter { |
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atomic_long_t count; |
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unsigned long limit; |
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struct page_counter *parent; |
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/* legacy */ |
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unsigned long watermark; |
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unsigned long failcnt; |
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}; |
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#if BITS_PER_LONG == 32 |
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#define PAGE_COUNTER_MAX LONG_MAX |
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#else |
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#define PAGE_COUNTER_MAX (LONG_MAX / PAGE_SIZE) |
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#endif |
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static inline void page_counter_init(struct page_counter *counter, |
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struct page_counter *parent) |
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{ |
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atomic_long_set(&counter->count, 0); |
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counter->limit = PAGE_COUNTER_MAX; |
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counter->parent = parent; |
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} |
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static inline unsigned long page_counter_read(struct page_counter *counter) |
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{ |
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return atomic_long_read(&counter->count); |
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} |
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void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages); |
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void page_counter_charge(struct page_counter *counter, unsigned long nr_pages); |
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bool page_counter_try_charge(struct page_counter *counter, |
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unsigned long nr_pages, |
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struct page_counter **fail); |
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void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages); |
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int page_counter_limit(struct page_counter *counter, unsigned long limit); |
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int page_counter_memparse(const char *buf, const char *max, |
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unsigned long *nr_pages); |
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static inline void page_counter_reset_watermark(struct page_counter *counter) |
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{ |
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counter->watermark = page_counter_read(counter); |
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} |
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#endif /* _LINUX_PAGE_COUNTER_H */
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