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Mon, 17 Aug 2020 13:03:52 -0400 X-MC-Unique: V4hR00iCP7Kv90I4SKUBcg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4D1F481F001; Mon, 17 Aug 2020 17:03:50 +0000 (UTC) Received: from [10.36.113.111] (ovpn-113-111.ams2.redhat.com [10.36.113.111]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3B78A19C4F; Mon, 17 Aug 2020 17:03:47 +0000 (UTC) Subject: Re: [RFC 0/7] Support high-order page bulk allocation From: David Hildenbrand To: Minchan Kim Cc: Andrew Morton , linux-mm , Joonsoo Kim , Vlastimil Babka , John Dias , Suren Baghdasaryan , pullip.cho@samsung.com References: <20200814173131.2803002-1-minchan@kernel.org> <4e2bd095-b693-9fed-40e0-ab538ec09aaa@redhat.com> <20200817152706.GB3852332@google.com> <20200817163018.GC3852332@google.com> Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 3E686374E5 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 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: >>>> A usecase is device can set a exclusive CMA area up when system boots. >>>> When device needs 4800 * order-4 pages, it could call this bulk against >>>> of the area so that it could effectively be guaranteed to allocate >>>> enough fast. >>> >>> Just wondering >>> >>> a) Why does it have to be fast? >> >> That's because it's related to application latency, which ends up >> user feel bad. > > Okay, but in theory, your device-needs are very similar to > application-needs, besides you requiring order-4 pages, correct? Similar > to an application that starts up and pins 300M (or more), just with > ordr-4 pages. Pinning was probably misleading. I meant either actual pinning, like vfio pins all pages backing a VM e.g., in QEMU, or mlocking+populating all memory. -- Thanks, David / dhildenb