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mm: mark pages in use for page tables
Define a new PageTable bit in the page_type and use it to mark pages in use as page tables. This can be helpful when debugging crashdumps or analysing memory fragmentation. Add a KPF flag to report these pages to userspace and update page-types.c to interpret that flag. Note that only pages currently accounted as NR_PAGETABLES are tracked as PageTable; this does not include pgd/p4d/pud/pmd pages. Those will be the subject of a later patch. Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Matthew Wilcox <[email protected]> Acked-by: Kirill A. Shutemov <[email protected]> Acked-by: Vlastimil Babka <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Jérôme Glisse <[email protected]> Cc: Lai Jiangshan <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: Pekka Enberg <[email protected]> Cc: Randy Dunlap <[email protected]> Cc: Andrey Ryabinin <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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