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Mon, 22 Feb 2021 11:28:59 +0000 (UTC) Received: from [10.36.115.16] (ovpn-115-16.ams2.redhat.com [10.36.115.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id E95CF5B6AA; Mon, 22 Feb 2021 11:28:57 +0000 (UTC) Subject: Re: [PATCH v2 0/7] Allocate memmap from hotadded memory (per device) To: Oscar Salvador , Andrew Morton Cc: Michal Hocko , VlastimilBabkavbabka@suse.cz, pasha.tatashin@soleen.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Anshuman Khandual References: <20210209133854.17399-1-osalvador@suse.de> <20210217101851.GA28996@linux> <20210222111506.GA23651@linux> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <8b4670fa-583a-b68b-a65f-7eeca184afd3@redhat.com> Date: Mon, 22 Feb 2021 12:28:22 +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: <20210222111506.GA23651@linux> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Stat-Signature: atkynaqomymhgags9cmuegohowytdt4g X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 23CC4E0011D9 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf13; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=216.205.24.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1613993343-293754 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 22.02.21 12:15, Oscar Salvador wrote: > On Wed, Feb 17, 2021 at 11:18:59AM +0100, Oscar Salvador wrote: >> On Tue, Feb 09, 2021 at 02:38:47PM +0100, Oscar Salvador wrote: >>> Hi, >>> >>> here is v2. >>> >>> Changes from v1 -> v2 >>> - Addressed feedback from David >>> - Fence off the feature in case struct page size is not >>> multiple of PMD size or pageblock alignment cannot be guaranted >>> - Tested on x86_64 small and large memory_blocks >>> - Tested on arm64 4KB and 64KB page sizes (for some reason I cannot boot >>> my VM with 16KB page size). >>> >>> Arm64 with 4KB page size behaves like x86_64 after [1], which made section >>> size smaller. >>> With 64KB, the feature gets fenced off due to pageblock alignment. >>> >>> Changes from RFCv3 -> v1: >>> - Addressed feedback from David >>> - Re-order patches >>> >>> Changes from v2 -> v3 (RFC): >>> - Re-order patches (Michal) >>> - Fold "mm,memory_hotplug: Introduce MHP_MEMMAP_ON_MEMORY" in patch#1 >>> - Add kernel boot option to enable this feature (Michal) >>> >>> Changes from v1 -> v2 (RFC): >>> - Addressed feedback provided by David >>> - Add a arch_support_memmap_on_memory to be called >>> from mhp_supports_memmap_on_memory, as atm, >>> only ARM, powerpc and x86_64 have altmat support. >>> >>> [1] https://lore.kernel.org/lkml/cover.1611206601.git.sudaraja@codeaurora.org/ >> >> Let me refloat this one :-) > > Kindly ping :-) -EBUSY, will try having a look this week! -- Thanks, David / dhildenb