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Tue, 16 Feb 2021 08:20:39 +0000 (UTC) Received: from [10.36.114.70] (ovpn-114-70.ams2.redhat.com [10.36.114.70]) by smtp.corp.redhat.com (Postfix) with ESMTP id 171BE10013DB; Tue, 16 Feb 2021 08:20:32 +0000 (UTC) Subject: Re: [External] Re: [PATCH v15 4/8] mm: hugetlb: alloc the vmemmap pages associated with each HugeTLB page To: Michal Hocko , Muchun Song Cc: Jonathan Corbet , Mike Kravetz , Thomas Gleixner , mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, Peter Zijlstra , viro@zeniv.linux.org.uk, Andrew Morton , paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, Randy Dunlap , oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, Mina Almasry , David Rientjes , Matthew Wilcox , Oscar Salvador , "Song Bao Hua (Barry Song)" , =?UTF-8?B?SE9SSUdVQ0hJIE5BT1lBKOWggOWPoyDnm7TkuZ8p?= , Joao Martins , Xiongchun duan , linux-doc@vger.kernel.org, LKML , Linux Memory Management List , linux-fsdevel References: From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <83ba1af6-7c11-3da7-eadb-020ca591bb56@redhat.com> Date: Tue, 16 Feb 2021 09:20:32 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 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: >> If current >> node has no memory and other nodes have enough memory. >> We can fail to allocate vmemmap pages. But actually it is >> suitable to allocate vmemmap pages from other nodes. >> Right? > > Falling back to a different node would be very suboptimal because then > you would have vmemmap back by remote pages. We do not want that. ... and we even warn when this happens right now: mm/sparse-vmemmap.c:vmemmap_verify() -- Thanks, David / dhildenb