From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from na01-bn1-obe.outbound.protection.outlook.com (mail-bn1on0117.outbound.protection.outlook.com [157.56.110.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 514491A08ED for ; Tue, 13 Oct 2015 11:22:55 +1100 (AEDT) Message-ID: <1444695749.5185.96.camel@freescale.com> Subject: Re: [PATCH v3 00/31] powerpc/mm: Update page table format for book3s 64 From: Scott Wood To: Aneesh Kumar K.V CC: , , , Date: Mon, 12 Oct 2015 19:22:29 -0500 In-Reply-To: <1444675215-19484-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1444675215-19484-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, 2015-10-13 at 00:09 +0530, Aneesh Kumar K.V wrote: > Hi All, > > This patch series attempt to update book3s 64 linux page table format to > make it more flexible. Our current pte format is very restrictive and we > overload multiple pte bits. This is due to the non-availability of free bits > in pte_t. We use pte_t to track the validity of 4K subpages. This patch > series free up pte_t of 11 bits by moving 4K subpage tracking to the > lower half of PTE page. The pte format is updated such that we have a > better method for identifying a pte entry at pmd level. This will also > enable > us to implement hugetlb migration(not yet done in this series). Acked-by: Scott Wood -Scott