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Shutemov" To: Matthew Wilcox Cc: linux-mm@kvack.org, Matthew Wilcox , Martin Schwidefsky , linux-kernel@vger.kernel.org, Fengguang Wu , linux-api@vger.kernel.org Subject: Re: [PATCH v4 4/4] mm: Mark pages in use for page tables Message-ID: <20180302082156.ty6nchnmwpniicyb@node.shutemov.name> References: <20180301211523.21104-1-willy@infradead.org> <20180301211523.21104-5-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180301211523.21104-5-willy@infradead.org> User-Agent: NeoMutt/20180223 Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Thu, Mar 01, 2018 at 01:15:23PM -0800, Matthew Wilcox wrote: > From: Matthew Wilcox > > 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 Acked-by: Kirill A. Shutemov -- Kirill A. Shutemov