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[195.135.220.15]) by mx.google.com with ESMTPS id f17si2478073ejt.214.2019.05.07.10.54.21 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 07 May 2019 10:54:21 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org 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 B223CAB91; Tue, 7 May 2019 17:54:20 +0000 (UTC) Date: Tue, 7 May 2019 19:54:19 +0200 From: Michal Hocko To: Sasha Levin Cc: Matthew Wilcox , Linus Torvalds , Alexander Duyck , LKML , stable , Mikhail Zaslonko , Gerald Schaefer , Mikhail Gavrilov , Dave Hansen , Alexander Duyck , Pasha Tatashin , Martin Schwidefsky , Heiko Carstens , Andrew Morton , Sasha Levin , linux-mm Subject: Re: [PATCH AUTOSEL 4.14 62/95] mm, memory_hotplug: initialize struct pages for the full memory section Message-ID: <20190507175419.GW31017@dhcp22.suse.cz> References: <20190507053826.31622-1-sashal@kernel.org> <20190507053826.31622-62-sashal@kernel.org> <20190507170208.GF1747@sasha-vm> <20190507171806.GG1747@sasha-vm> <20190507173224.GS31017@dhcp22.suse.cz> <20190507173655.GA1403@bombadil.infradead.org> <20190507174514.GI1747@sasha-vm> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190507174514.GI1747@sasha-vm> 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 Tue 07-05-19 13:45:14, Sasha Levin wrote: [...] > We're going to have (quite a) large amount of systems with "weird" > memory layouts that do memory hotplug quite frequently in production, so > this whole "tends to work usually" thing kinda scares me. Memory hotplug is simply not production ready for those cases, unfortunately. It tends to work just fine with properly section aligned systems with memory being in the movable zones or for zone device. Everything beyond that is kinda long way to get there... -- Michal Hocko SUSE Labs