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[2620:137:e000::1:9]) by mx.google.com with ESMTPS id q17si1491523wrj.420.2019.03.06.11.04.39 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Mar 2019 11:04:39 -0800 (PST) Received-SPF: neutral (google.com: 2620:137:e000::1:9 is neither permitted nor denied by best guess record for domain of davem@davemloft.net) client-ip=2620:137:e000::1:9; Authentication-Results: mx.google.com; spf=neutral (google.com: 2620:137:e000::1:9 is neither permitted nor denied by best guess record for domain of davem@davemloft.net) smtp.mailfrom=davem@davemloft.net 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 Cc: vbabka@suse.cz, catalin.marinas@arm.com, will.deacon@arm.com, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, mike.kravetz@oracle.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org 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-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: 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