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[209.132.183.28]) by mx.google.com with ESMTPS id i5si11113724qvv.2.2019.06.19.02.11.22 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Jun 2019 02:11:22 -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-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B19AB10C94; Wed, 19 Jun 2019 09:11:16 +0000 (UTC) Received: from [10.36.117.229] (ovpn-117-229.ams2.redhat.com [10.36.117.229]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4679910190A9; Wed, 19 Jun 2019 09:11:12 +0000 (UTC) Subject: Re: [PATCH v2] mm/sparse: set section nid for hot-add memory To: Michal Hocko Cc: Wei Yang , Oscar Salvador , linux-mm@kvack.org, akpm@linux-foundation.org, anshuman.khandual@arm.com References: <20190618005537.18878-1-richardw.yang@linux.intel.com> <20190618074900.GA10030@linux> <20190618083212.GA24738@richard> <93d7ea6c-135e-7f12-9d75-b3657862dea0@redhat.com> <20190619061025.GA5717@dhcp22.suse.cz> <20190619090126.GI2968@dhcp22.suse.cz> <5630056e-cc60-c451-714b-f8524eb70839@redhat.com> <20190619090824.GK2968@dhcp22.suse.cz> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190619090824.GK2968@dhcp22.suse.cz> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 19 Jun 2019 09:11:16 +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 19.06.19 11:08, Michal Hocko wrote: > On Wed 19-06-19 11:03:49, David Hildenbrand wrote: >> On 19.06.19 11:01, Michal Hocko wrote: > [...] >>> And if they do need a smaller granularity to describe their >>> memory topology then we need a different user API rather the fiddle with >>> implementation details I would argue. >>> >> >> It is not about supporting it, it is about properly blocking it. > > We already do that in test_pages_in_a_zone, right? Albeit in > MAX_ORDER_NR_PAGES granularity. > Indeed, thanks for pointing that out. I knew that we were checking zones but had in my head that it was working on zone idx. -- Thanks, David / dhildenb