tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
mm: Add folio_evictable()
This is the folio equivalent of page_evictable(). Unfortunately, it's
different from !folio_test_unevictable(), but I think it's used in places
where you have to be a VM expert and can reasonably be expected to know
the difference.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
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mm/internal.h
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mm/internal.h
···
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pgoff_t end, struct pagevec *pvec, pgoff_t *indices);
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/**
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* page_evictable - test whether a page is evictable
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* @page: the page to test
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* folio_evictable - Test whether a folio is evictable.
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* @folio: The folio to test.
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*
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* Test whether page is evictable--i.e., should be placed on active/inactive
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* lists vs unevictable list.
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* Test whether @folio is evictable -- i.e., should be placed on
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* active/inactive lists vs unevictable list.
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*
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* Reasons page might not be evictable:
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* (1) page's mapping marked unevictable
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* (2) page is part of an mlocked VMA
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*
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* Reasons folio might not be evictable:
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* 1. folio's mapping marked unevictable
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* 2. One of the pages in the folio is part of an mlocked VMA
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*/
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static inline bool folio_evictable(struct folio *folio)
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{
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bool ret;
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/* Prevent address_space of inode and swap cache from being freed */
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rcu_read_lock();
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ret = !mapping_unevictable(folio_mapping(folio)) &&
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!folio_test_mlocked(folio);
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rcu_read_unlock();
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return ret;
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}
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static inline bool page_evictable(struct page *page)
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{
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bool ret;