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mm: page cache: store only head pages in i_pages
Transparent Huge Pages are currently stored in i_pages as pointers to consecutive subpages. This patch changes that to storing consecutive pointers to the head page in preparation for storing huge pages more efficiently in i_pages. Large parts of this are "inspired" by Kirill's patch https://lore.kernel.org/lkml/[email protected]/ [[email protected]: fix swapcache pages] Link: http://lkml.kernel.org/r/[email protected] [[email protected]: hugetlb stores pages in page cache differently] Link: http://lkml.kernel.org/r/20190404134553.vuvhgmghlkiw2hgl@kshutemo-mobl1 Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Matthew Wilcox <[email protected]> Acked-by: Jan Kara <[email protected]> Reviewed-by: Kirill Shutemov <[email protected]> Reviewed-and-tested-by: Song Liu <[email protected]> Tested-by: William Kucharski <[email protected]> Reviewed-by: William Kucharski <[email protected]> Tested-by: Qian Cai <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Song Liu <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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