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[209.132.183.28]) by mx.google.com with ESMTPS id g9si5730141qte.319.2019.05.22.00.29.24 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 May 2019 00:29:24 -0700 (PDT) Received-SPF: pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5487C3082E23; Wed, 22 May 2019 07:29:23 +0000 (UTC) Received: from [10.36.117.97] (ovpn-117-97.ams2.redhat.com [10.36.117.97]) by smtp.corp.redhat.com (Postfix) with ESMTP id D84ED4B7; Wed, 22 May 2019 07:29:21 +0000 (UTC) Subject: Re: [PATCH] docs: reorder memory-hotplug documentation To: Oscar Salvador Cc: Mike Rapoport , Jonathan Corbet , linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <1557822213-19058-1-git-send-email-rppt@linux.ibm.com> <43092504-a95f-374d-f3db-b961dd8ac428@redhat.com> <20190521161101.GA2372@linux> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190521161101.GA2372@linux> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Wed, 22 May 2019 07:29:23 +0000 (UTC) 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 21.05.19 18:11, Oscar Salvador wrote: > On Tue, May 21, 2019 at 12:41:50PM +0200, David Hildenbrand wrote: >>> +Future Work >>> +=========== >>> + >>> + - allowing memory hot-add to ZONE_MOVABLE. maybe we need some switch like >>> + sysctl or new control file. >> >> ... that already works if I am not completely missing the point here > > It does. > >>> + - support HugeTLB page migration and offlining. >> >> ... I remember that Oscar was doing something in that area, Oscar? > > Yes, in general offlinining on hugetlb pages was already working, but we did not > allow to offline 1GB-hugetlb pages on x86_64. > I removed that limitation with > ("commit: 10eeadf3045c mm,memory_hotplug: unlock 1GB-hugetlb on x86_64") , so now > offlining on hugetlb pages should be fully operative. > >> I'd vote for removing the future work part, this is pretty outdated. > > Instead of removing it, I would rather make it consistent with the present. > E.g: > > - Move page handling from memory-hotremove to offline stage > - Enable a way to allocate vmemmap pages from hot-added memory > etc. > > Fair enough, but at least the current content is absolutely useless and confusing/misleading. -- Thanks, David / dhildenb