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[195.135.220.15]) by mx.google.com with ESMTPS id l22si7447136ejb.205.2019.06.19.02.08.25 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Jun 2019 02:08:26 -0700 (PDT) Received-SPF: pass (google.com: domain of mhocko@suse.com designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of mhocko@suse.com designates 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@suse.com X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 618CBAF57; Wed, 19 Jun 2019 09:08:25 +0000 (UTC) Date: Wed, 19 Jun 2019 11:08:24 +0200 From: Michal Hocko To: David Hildenbrand Cc: Wei Yang , Oscar Salvador , linux-mm@kvack.org, akpm@linux-foundation.org, anshuman.khandual@arm.com Subject: Re: [PATCH v2] mm/sparse: set section nid for hot-add memory Message-ID: <20190619090824.GK2968@dhcp22.suse.cz> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5630056e-cc60-c451-714b-f8524eb70839@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) 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 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. -- Michal Hocko SUSE Labs