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Wed, 28 Oct 2020 18:48:05 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 09SIkThZ027035; Wed, 28 Oct 2020 18:48:04 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3030.oracle.com with ESMTP id 34cwunx6pv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 28 Oct 2020 18:48:04 +0000 Received: from abhmp0004.oracle.com (abhmp0004.oracle.com [141.146.116.10]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 09SIlwJ9010274; Wed, 28 Oct 2020 18:47:59 GMT Received: from [192.168.2.112] (/50.38.35.18) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 28 Oct 2020 11:47:58 -0700 Subject: Re: [RFC PATCH 0/3] Allocate memmap from hotadded memory (per device) To: Oscar Salvador , David Hildenbrand Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, vbabka@suse.cz, pasha.tatashin@soleen.com References: <20201022125835.26396-1-osalvador@suse.de> <3c18e078-25df-3fd4-9988-1b7677d8e05f@redhat.com> <20201027154031.GA11489@linux> <20201027155851.GA11785@linux> From: Mike Kravetz Message-ID: <259889fb-f01b-9537-7948-f1a75a372617@oracle.com> Date: Wed, 28 Oct 2020 11:47:57 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20201027155851.GA11785@linux> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9788 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 mlxscore=0 bulkscore=0 spamscore=0 adultscore=0 malwarescore=0 mlxlogscore=952 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010280120 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9788 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 impostorscore=0 mlxlogscore=949 malwarescore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 spamscore=0 phishscore=0 clxscore=1015 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010280120 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 10/27/20 8:58 AM, Oscar Salvador wrote: > On Tue, Oct 27, 2020 at 04:44:33PM +0100, David Hildenbrand wrote: >> I'm planning on looking into patch #2/3 later this or next week (this week >> is open source summit / KVM Forum). > > Sure, aprecciated the time ;-) > >> >> One thing to look into right now is how to make this fly this with vmemmap >> optimizations for hugetlb pages. >> >> https://lkml.kernel.org/r/20201026145114.59424-1-songmuchun@bytedance.com > > I was about to have a look at that series eitherway, but good you mentioned. > More eyes on that series would be appreciated. That series will dynamically free and allocate memmap pages as hugetlb pages are allocated or freed. I haven't looked through this series, but my first thought is that we would need to ensure those allocs/frees are directed to the device. Not sure if there are interfaces for that. -- Mike Kravetz