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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 1658DC433E0 for ; Thu, 2 Jul 2020 14:05:46 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 D0DC420780 for ; Thu, 2 Jul 2020 14:05:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="A/E5Lqf2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D0DC420780 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=HUUqGE7cytXDkZsESRlZ/81B/kF20yBqwhKAq2bAxpk=; b=A/E5Lqf2BYVoqMZ3k6UYii9hj pV1Y9LMlEbTa4rv2A0GeD49SPhdzuWfcVJG2xk8i2N4Yh5oRYaGrUm+joHX3uu9zCmfWCm3efyP9+ +CNM6jm6+KhgyPCRN7ISGYT/W7vGnz+eUifjSsVkAdHRa9UlrJ/Q0wiDz3psToGMPdKqLRooFP4lW PDPwYqpREMs2UxfPrwqFwc3MuiEVWhA/uzwKbckQaIi0ClX6lxsTtN7tyxmKLgzUfXWmrZZiKQQkz wsyDRLRfDU2qri8D0g8qWdexnCGeOtnwrMS7yxXwusqz9vpfwQuy4UwXkEaWwgTjqVFkFFaYqYsOt /W5KHe50w==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jqzor-0004Re-NY; Thu, 02 Jul 2020 14:04:05 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jqzoo-0004Qk-Rj; Thu, 02 Jul 2020 14:04:03 +0000 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 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-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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_100403_049455_6102A63D X-CRM114-Status: GOOD ( 19.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Michal Hocko , linux-ia64@vger.kernel.org, David Hildenbrand , Peter Zijlstra , Dave Hansen , linux-mm@kvack.org, linux-riscv@lists.infradead.org, Will Deacon , Thomas Gleixner , x86@kernel.org, "Matthew Wilcox \(Oracle\)" , Mike Rapoport , Ingo Molnar , Fenghua Yu , Pavel Tatashin , Andy Lutomirski , Paul Walmsley , Dan Williams , linux-arm-kernel@lists.infradead.org, Tony Luck , linux-kernel@vger.kernel.org, Palmer Dabbelt , Andrew Morton , "Kirill A. Shutemov" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel