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[140.211.169.12]) by mx.google.com with ESMTPS id l66si37721075pfl.258.2019.01.29.14.56.54 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 29 Jan 2019 14:56:54 -0800 (PST) Received-SPF: pass (google.com: domain of akpm@linux-foundation.org designates 140.211.169.12 as permitted sender) client-ip=140.211.169.12; Authentication-Results: mx.google.com; spf=pass (google.com: domain of akpm@linux-foundation.org designates 140.211.169.12 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org Received: from akpm3.svl.corp.google.com (unknown [104.133.8.65]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 35E213470; Tue, 29 Jan 2019 22:56:54 +0000 (UTC) Date: Tue, 29 Jan 2019 14:56:52 -0800 From: Andrew Morton To: "Aneesh Kumar K.V" Cc: Michal Hocko , Alexey Kardashevskiy , David Gibson , Andrea Arcangeli , mpe@ellerman.id.au, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH V7 0/4] mm/kvm/vfio/ppc64: Migrate compound pages out of CMA region Message-Id: <20190129145652.c4021a4adf8416618211c38d@linux-foundation.org> In-Reply-To: <20190114095438.32470-1-aneesh.kumar@linux.ibm.com> References: <20190114095438.32470-1-aneesh.kumar@linux.ibm.com> X-Mailer: Sylpheed 3.6.0 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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 Mon, 14 Jan 2019 15:24:32 +0530 "Aneesh Kumar K.V" wrote: > ppc64 use CMA area for the allocation of guest page table (hash page table). We won't > be able to start guest if we fail to allocate hash page table. We have observed > hash table allocation failure because we failed to migrate pages out of CMA region > because they were pinned. This happen when we are using VFIO. VFIO on ppc64 pins > the entire guest RAM. If the guest RAM pages get allocated out of CMA region, we > won't be able to migrate those pages. The pages are also pinned for the lifetime of the > guest. > > Currently we support migration of non-compound pages. With THP and with the addition of > hugetlb migration we can end up allocating compound pages from CMA region. This > patch series add support for migrating compound pages. Very little review activity is in evidence. Please identify some appropriate reviewers and ask them to take a look?