Re: [PATCH v4 4/4] mm: Mark pages in use for page tables

[Kirill A. Shutemov]

On Thu, Mar 01, 2018 at 01:15:23PM -0800, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
> 
> 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.

I guess it's worth noting in the commit message that PGD and P4D page
tables are not acoounted to NR_PAGETABLE and not marked with PageTable().
> 
> Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>

Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>

-- 
 Kirill A. Shutemov