From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-x244.google.com (mail-pg0-x244.google.com [IPv6:2607:f8b0:400e:c05::244]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3w2l6P5TqlzDq5W for ; Wed, 12 Apr 2017 10:24:29 +1000 (AEST) Received: by mail-pg0-x244.google.com with SMTP id 79so2200196pgf.0 for ; Tue, 11 Apr 2017 17:24:29 -0700 (PDT) Message-ID: <1491956661.8380.9.camel@gmail.com> Subject: Re: [PATCH 5/9] powerpc/vmemmap: Add altmap support From: Balbir Singh To: Oliver O'Halloran , linuxppc-dev@lists.ozlabs.org Cc: arbab@linux.vnet.ibm.com, linux-nvdimm@lists.01.org Date: Wed, 12 Apr 2017 10:24:21 +1000 In-Reply-To: <20170411174233.21902-6-oohall@gmail.com> References: <20170411174233.21902-1-oohall@gmail.com> <20170411174233.21902-6-oohall@gmail.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 Wed, 2017-04-12 at 03:42 +1000, Oliver O'Halloran wrote: > Adds support to powerpc for the altmap feature of ZONE_DEVICE memory. An > altmap is a driver provided region that is used to provide the backing > storage for the struct pages of ZONE_DEVICE memory. In situations where > large amount of ZONE_DEVICE memory is being added to the system the > altmap reduces pressure on main system memory by allowing the mm/ > metadata to be stored on the device itself rather in main memory. > > Signed-off-by: Oliver O'Halloran > --- Reviewed-by: Balbir Singh