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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>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-05-14 15:04:28 -04:00
parent 0995d7e568
commit 3eed3ef55c
1 changed files with 19 additions and 8 deletions
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27
mm/internal.h
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@ -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;