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mm/thp: allow dropping THP from page cache

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Once a THP is added to the page cache, it cannot be dropped via
/proc/sys/vm/drop_caches.  Fix this issue with proper handling in
invalidate_mapping_pages().

Link: http://lkml.kernel.org/r/[email protected]
Fixes: 99cb0dbd47 ("mm,thp: add read-only THP support for (non-shmem) FS")
Signed-off-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Song Liu <[email protected]>
Tested-by: Song Liu <[email protected]>
Acked-by: Yang Shi <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Cc: William Kucharski <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2019-10-18 20:20:36 -07:00 • committed by Linus Torvalds
commit ef18a1ca84
1 changed files with 12 additions and 0 deletions
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12
mm/truncate.c
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@ -592,6 +592,16 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping,
unlock_page(page);
continue;
}
/* Take a pin outside pagevec */
get_page(page);
/*
* Drop extra pins before trying to invalidate
* the huge page.
*/
pagevec_remove_exceptionals(&pvec);
pagevec_release(&pvec);
}
ret = invalidate_inode_page(page);
@ -602,6 +612,8 @@ unsigned long invalidate_mapping_pages(struct address_space *mapping,
*/
if (!ret)
deactivate_file_page(page);
if (PageTransHuge(page))
put_page(page);
count += ret;
}
pagevec_remove_exceptionals(&pvec);