Commit 3efe62e4 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Linus Torvalds
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mm/vmscan: allow arbitrary sized pages to be paged out 



Remove the assumption that a compound page has HPAGE_PMD_NR pins from the
page cache.

Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarSeongJae Park <sjpark@amazon.de>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: default avatar"Huang, Ying" <ying.huang@intel.com>
Link: https://lkml.kernel.org/r/20200908195539.25896-12-willy@infradead.org


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8854a6a7

mm/vmscan.c

+1 −2
Original line number Diff line number Diff line
@@ -725,8 +725,7 @@ static inline int is_page_cache_freeable(struct page *page) 
	 * that isolated the page, the page cache and optional buffer

	 * heads at page->private.

	 */

	int page_cache_pins = PageTransHuge(page) && PageSwapCache(page) ?

		HPAGE_PMD_NR : 1;

	int page_cache_pins = thp_nr_pages(page);

	return page_count(page) - page_has_private(page) == 1 + page_cache_pins;

}