From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1AC0FC43381 for ; Wed, 6 Mar 2019 19:09:50 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A64352064A for ; Wed, 6 Mar 2019 19:09:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A64352064A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=davemloft.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 44F3Gz4XbYzDq5b for ; Thu, 7 Mar 2019 06:09:47 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=davemloft.net (client-ip=2620:137:e000::1:9; helo=shards.monkeyblade.net; envelope-from=davem@davemloft.net; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=davemloft.net Received: from shards.monkeyblade.net (shards.monkeyblade.net [IPv6:2620:137:e000::1:9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 44F39C2lxZzDqB2 for ; Thu, 7 Mar 2019 06:04:46 +1100 (AEDT) Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::d71]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id A91A1145183B2; Wed, 6 Mar 2019 11:04:36 -0800 (PST) Date: Wed, 06 Mar 2019 11:04:36 -0800 (PST) Message-Id: <20190306.110436.1714716608828903522.davem@davemloft.net> To: alex@ghiti.fr Subject: Re: [PATCH v5 2/4] sparc: Advertise gigantic page support From: David Miller In-Reply-To: <20190306190005.7036-3-alex@ghiti.fr> References: <20190306190005.7036-1-alex@ghiti.fr> <20190306190005.7036-3-alex@ghiti.fr> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Wed, 06 Mar 2019 11:04:37 -0800 (PST) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dalias@libc.org, linux-sh@vger.kernel.org, peterz@infradead.org, dave.hansen@linux.intel.com, heiko.carstens@de.ibm.com, linux-mm@kvack.org, paulus@samba.org, hpa@zytor.com, sparclinux@vger.kernel.org, linux-s390@vger.kernel.org, ysato@users.sourceforge.jp, x86@kernel.org, mingo@redhat.com, vbabka@suse.cz, catalin.marinas@arm.com, will.deacon@arm.com, bp@alien8.de, luto@kernel.org, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, schwidefsky@de.ibm.com, linuxppc-dev@lists.ozlabs.org, mike.kravetz@oracle.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Alexandre Ghiti Date: Wed, 6 Mar 2019 14:00:03 -0500 > sparc actually supports gigantic pages and selecting > ARCH_HAS_GIGANTIC_PAGE allows it to allocate and free > gigantic pages at runtime. > > sparc allows configuration such as huge pages of 16GB, > pages of 8KB and MAX_ORDER = 13 (default): > HPAGE_SHIFT (34) - PAGE_SHIFT (13) = 21 >= MAX_ORDER (13) > > Signed-off-by: Alexandre Ghiti Much better. Acked-by: David S. Miller