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=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 EEEE3C433E0 for ; Thu, 2 Jul 2020 14:04:15 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BAEA320890 for ; Thu, 2 Jul 2020 14:04:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BAEA320890 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 44FD08D001D; Thu, 2 Jul 2020 10:04:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3D92A8D001C; Thu, 2 Jul 2020 10:04:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 279BE8D001D; Thu, 2 Jul 2020 10:04:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0064.hostedemail.com [216.40.44.64]) by kanga.kvack.org (Postfix) with ESMTP id 0D0BF8D001C for ; Thu, 2 Jul 2020 10:04:15 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id AF52E181AC9BF for ; Thu, 2 Jul 2020 14:04:14 +0000 (UTC) X-FDA: 76993305228.26.band75_610a3df26e89 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin26.hostedemail.com (Postfix) with ESMTP id 12E121804A322 for ; Thu, 2 Jul 2020 14:04:04 +0000 (UTC) X-HE-Tag: band75_610a3df26e89 X-Filterd-Recvd-Size: 4691 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf09.hostedemail.com (Postfix) with ESMTP for ; Thu, 2 Jul 2020 14:04:03 +0000 (UTC) Received: from gaia (unknown [95.146.230.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 341F920772; Thu, 2 Jul 2020 14:03:58 +0000 (UTC) Date: Thu, 2 Jul 2020 15:03:55 +0100 From: Catalin Marinas To: Anshuman Khandual Cc: linux-mm@kvack.org, Will Deacon , Mark Rutland , Paul Walmsley , Palmer Dabbelt , Tony Luck , Fenghua Yu , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , David Hildenbrand , Mike Rapoport , Michal Hocko , "Matthew Wilcox (Oracle)" , "Kirill A. Shutemov" , Andrew Morton , Dan Williams , Pavel Tatashin , linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-riscv@lists.infradead.org, x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH V3 (RESEND) 1/3] mm/sparsemem: Enable vmem_altmap support in vmemmap_populate_basepages() Message-ID: <20200702140355.GE22241@gaia> References: <1592442930-9380-1-git-send-email-anshuman.khandual@arm.com> <1592442930-9380-2-git-send-email-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1592442930-9380-2-git-send-email-anshuman.khandual@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Rspamd-Queue-Id: 12E121804A322 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 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 Thu, Jun 18, 2020 at 06:45:28AM +0530, Anshuman Khandual wrote: > vmemmap_populate_basepages() is used across platforms to allocate backing > memory for vmemmap mapping. This is used as a standard default choice or > as a fallback when intended huge pages allocation fails. This just creates > entire vmemmap mapping with base pages (PAGE_SIZE). > > On arm64 platforms, vmemmap_populate_basepages() is called instead of the > platform specific vmemmap_populate() when ARM64_SWAPPER_USES_SECTION_MAPS > is not enabled as in case for ARM64_16K_PAGES and ARM64_64K_PAGES configs. > > At present vmemmap_populate_basepages() does not support allocating from > driver defined struct vmem_altmap while trying to create vmemmap mapping > for a device memory range. It prevents ARM64_16K_PAGES and ARM64_64K_PAGES > configs on arm64 from supporting device memory with vmemap_altmap request. > > This enables vmem_altmap support in vmemmap_populate_basepages() unlocking > device memory allocation for vmemap mapping on arm64 platforms with 16K or > 64K base page configs. > > Each architecture should evaluate and decide on subscribing device memory > based base page allocation through vmemmap_populate_basepages(). Hence lets > keep it disabled on all archs in order to preserve the existing semantics. > A subsequent patch enables it on arm64. > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Mark Rutland > Cc: Paul Walmsley > Cc: Palmer Dabbelt > Cc: Tony Luck > Cc: Fenghua Yu > Cc: Dave Hansen > Cc: Andy Lutomirski > Cc: Peter Zijlstra > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: David Hildenbrand > Cc: Mike Rapoport > Cc: Michal Hocko > Cc: "Matthew Wilcox (Oracle)" > Cc: "Kirill A. Shutemov" > Cc: Andrew Morton > Cc: Dan Williams > Cc: Pavel Tatashin > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-ia64@vger.kernel.org > Cc: linux-riscv@lists.infradead.org > Cc: x86@kernel.org > Cc: linux-kernel@vger.kernel.org > Tested-by: Jia He > Acked-by: Will Deacon > Signed-off-by: Anshuman Khandual For arm64: Acked-by: Catalin Marinas