68a22394c2
If vm_swap_full() (swap space more than 50% full), the system will free swap space at swapin time. With this patch, the system will also free the swap space in the pageout code, when we decide that the page is not a candidate for swapout (and just wasting swap space). Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: MinChan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/*
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* include/linux/pagevec.h
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*
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* In many places it is efficient to batch an operation up against multiple
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* pages. A pagevec is a multipage container which is used for that.
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*/
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#ifndef _LINUX_PAGEVEC_H
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#define _LINUX_PAGEVEC_H
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/* 14 pointers + two long's align the pagevec structure to a power of two */
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#define PAGEVEC_SIZE 14
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struct page;
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struct address_space;
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struct pagevec {
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unsigned long nr;
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unsigned long cold;
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struct page *pages[PAGEVEC_SIZE];
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};
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void __pagevec_release(struct pagevec *pvec);
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void __pagevec_release_nonlru(struct pagevec *pvec);
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void __pagevec_free(struct pagevec *pvec);
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void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru);
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void pagevec_strip(struct pagevec *pvec);
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void pagevec_swap_free(struct pagevec *pvec);
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unsigned pagevec_lookup(struct pagevec *pvec, struct address_space *mapping,
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pgoff_t start, unsigned nr_pages);
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unsigned pagevec_lookup_tag(struct pagevec *pvec,
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struct address_space *mapping, pgoff_t *index, int tag,
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unsigned nr_pages);
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static inline void pagevec_init(struct pagevec *pvec, int cold)
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{
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pvec->nr = 0;
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pvec->cold = cold;
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}
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static inline void pagevec_reinit(struct pagevec *pvec)
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{
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pvec->nr = 0;
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}
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static inline unsigned pagevec_count(struct pagevec *pvec)
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{
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return pvec->nr;
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}
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static inline unsigned pagevec_space(struct pagevec *pvec)
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{
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return PAGEVEC_SIZE - pvec->nr;
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}
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/*
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* Add a page to a pagevec. Returns the number of slots still available.
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*/
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static inline unsigned pagevec_add(struct pagevec *pvec, struct page *page)
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{
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pvec->pages[pvec->nr++] = page;
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return pagevec_space(pvec);
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}
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static inline void pagevec_release(struct pagevec *pvec)
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{
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if (pagevec_count(pvec))
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__pagevec_release(pvec);
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}
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static inline void pagevec_release_nonlru(struct pagevec *pvec)
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{
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if (pagevec_count(pvec))
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__pagevec_release_nonlru(pvec);
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}
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static inline void pagevec_free(struct pagevec *pvec)
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{
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if (pagevec_count(pvec))
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__pagevec_free(pvec);
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}
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static inline void __pagevec_lru_add(struct pagevec *pvec)
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{
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____pagevec_lru_add(pvec, LRU_INACTIVE);
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}
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static inline void __pagevec_lru_add_active(struct pagevec *pvec)
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{
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____pagevec_lru_add(pvec, LRU_ACTIVE);
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}
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static inline void pagevec_lru_add(struct pagevec *pvec)
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{
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if (pagevec_count(pvec))
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__pagevec_lru_add(pvec);
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}
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#endif /* _LINUX_PAGEVEC_H */
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