Commit 3eed3ef5 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle)
Browse files

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: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
parent 0995d7e5

mm/internal.h

+19 −8
Original line number Diff line number Diff line
@@ -72,17 +72,28 @@ unsigned find_lock_entries(struct address_space *mapping, pgoff_t start, 
		pgoff_t end, struct pagevec *pvec, pgoff_t *indices);



/**

 * page_evictable - test whether a page is evictable

 * @page: the page to test

 * folio_evictable - Test whether a folio is evictable.

 * @folio: The folio to test.

 *

 * Test whether page is evictable--i.e., should be placed on active/inactive

 * lists vs unevictable list.

 *

 * Reasons page might not be evictable:

 * (1) page's mapping marked unevictable

 * (2) page is part of an mlocked VMA

 * Test whether @folio is evictable -- i.e., should be placed on

 * active/inactive lists vs unevictable list.

 *

 * Reasons folio might not be evictable:

 * 1. folio's mapping marked unevictable

 * 2. One of the pages in the folio is part of an mlocked VMA

 */

static inline bool folio_evictable(struct folio *folio)

{

	bool ret;



	/* Prevent address_space of inode and swap cache from being freed */

	rcu_read_lock();

	ret = !mapping_unevictable(folio_mapping(folio)) &&

			!folio_test_mlocked(folio);

	rcu_read_unlock();

	return ret;

}



static inline bool page_evictable(struct page *page)

{

	bool ret;