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

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Message-ID: <20180302082156.ty6nchnmwpniicyb@node.shutemov.name>
Date:   Fri, 2 Mar 2018 11:21:56 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-mm@...ck.org, Matthew Wilcox <mawilcox@...rosoft.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-kernel@...r.kernel.org,
        Fengguang Wu <fengguang.wu@...el.com>,
        linux-api@...r.kernel.org
Subject: Re: [PATCH v4 4/4] mm: Mark pages in use for page tables

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

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov