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[209.132.183.28]) by mx.google.com with ESMTPS id d4si4366884qkk.210.2019.04.04.01.49.22 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 04 Apr 2019 01:49:22 -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-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 738E730821A5; Thu, 4 Apr 2019 08:49:21 +0000 (UTC) Received: from [10.36.117.116] (ovpn-117-116.ams2.redhat.com [10.36.117.116]) by smtp.corp.redhat.com (Postfix) with ESMTP id D700298A9; Thu, 4 Apr 2019 08:49:17 +0000 (UTC) Subject: Re: [PATCH 1/6] arm64/mm: Enable sysfs based memory hot add interface To: Anshuman Khandual , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, akpm@linux-foundation.org, will.deacon@arm.com, catalin.marinas@arm.com Cc: mhocko@suse.com, mgorman@techsingularity.net, james.morse@arm.com, mark.rutland@arm.com, robin.murphy@arm.com, cpandya@codeaurora.org, arunks@codeaurora.org, dan.j.williams@intel.com, osalvador@suse.de, logang@deltatee.com, pasha.tatashin@oracle.com, cai@lca.pw References: <1554265806-11501-1-git-send-email-anshuman.khandual@arm.com> <1554265806-11501-2-git-send-email-anshuman.khandual@arm.com> <4b9dd2b0-3b11-608c-1a40-9a3d203dd904@redhat.com> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Thu, 04 Apr 2019 08:49:21 +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 04.04.19 07:25, Anshuman Khandual wrote: > > > On 04/03/2019 01:50 PM, David Hildenbrand wrote: >> On 03.04.19 06:30, Anshuman Khandual wrote: >>> Sysfs memory probe interface (/sys/devices/system/memory/probe) can accept >>> starting physical address of an entire memory block to be hot added into >>> the kernel. This is in addition to the existing ACPI based interface. This >>> just enables it with the required config CONFIG_ARCH_MEMORY_PROBE. >>> >> We recently discussed that the similar interface for removal should >> rather be moved to a debug/test module. > > Can we maintain such a debug/test module mainline and enable it when required. Or > can have both add and remove interface at /sys/kernel/debug/ just for testing > purpose. I assume we could put such a module into mainline. It could span up an interface in debugfs. -- Thanks, David / dhildenb