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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 24 Apr 2019 12:35:12 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3OBZCfJ57606294 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 24 Apr 2019 11:35:12 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F3A425205F; Wed, 24 Apr 2019 11:35:11 +0000 (GMT) Received: from rapoport-lnx (unknown [9.148.8.112]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTPS id 897E85204F; Wed, 24 Apr 2019 11:35:11 +0000 (GMT) Date: Wed, 24 Apr 2019 14:35:09 +0300 From: Mike Rapoport To: Anshuman Khandual Cc: Jonathan Corbet , linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] docs/vm: add documentation of memory models References: <1556101715-31966-1-git-send-email-rppt@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 19042411-0016-0000-0000-00000272FB6B X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19042411-0017-0000-0000-000032CF6C95 Message-Id: <20190424113509.GB6278@rapoport-lnx> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-24_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=976 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904240095 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Apr 24, 2019 at 04:20:02PM +0530, Anshuman Khandual wrote: > > > On 04/24/2019 03:58 PM, Mike Rapoport wrote: > > +To use vmemmap, an architecture has to reserve a range of virtual > > +addresses that will map the physical pages containing the memory > > +map. and make sure that `vmemmap` points to that range. In addition, > > +the architecture should implement :c:func:`vmemmap_populate` method > > +that will allocate the physical memory and create page tables for the > > +virtual memory map. If an architecture does not have any special > > +requirements for the vmemmap mappings, it can use default > > +:c:func:`vmemmap_populate_basepages` provided by the generic memory > > +management. > > Just to complete it, could you also include struct vmem_altmap and how it > can contribute towards the physical backing for vmemmap virtual mapping. > Otherwise the write up looks complete. Sure, but I'd prefer having it as a separate patch. -- Sincerely yours, Mike.