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=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham 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 1B3E1C5517A for ; Sun, 1 Nov 2020 17:06:30 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BDFBC208B6 for ; Sun, 1 Nov 2020 17:06:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Vz7hlCOf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BDFBC208B6 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5F8316B009F; Sun, 1 Nov 2020 12:06:29 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 5A7C46B00A0; Sun, 1 Nov 2020 12:06:29 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 496246B00A1; Sun, 1 Nov 2020 12:06:29 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0224.hostedemail.com [216.40.44.224]) by kanga.kvack.org (Postfix) with ESMTP id 1D09B6B009F for ; Sun, 1 Nov 2020 12:06:29 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id D4505181AEF0B for ; Sun, 1 Nov 2020 17:06:27 +0000 (UTC) X-FDA: 77436478014.01.dad64_4908483272a9 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id B436D10047E2B for ; Sun, 1 Nov 2020 17:06:27 +0000 (UTC) X-HE-Tag: dad64_4908483272a9 X-Filterd-Recvd-Size: 5486 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf39.hostedemail.com (Postfix) with ESMTP for ; Sun, 1 Nov 2020 17:06:27 +0000 (UTC) Received: from aquarius.haifa.ibm.com (nesher1.haifa.il.ibm.com [195.110.40.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 911202223F; Sun, 1 Nov 2020 17:06:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604250386; bh=fWxkbZL/5LT7MVmydGQvto+yiZVxeeiLovyNTt2+nMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vz7hlCOfEKvhdYdVx02tccXCR69Tgvys6SCSJ/AwADwwmLCxWzCZRFA3N4DSZ0TNf NMj2sjlY5sUvwwkqZVyNWvWsIKsoWRy4e5mWYOTcjMU9Z7iDHW/BBbA5ZKDtLBao9Y XcPPJPO0UL5x9C2pQixh7DUbitUwk4/sJ48l2D4E= From: Mike Rapoport To: Andrew Morton Cc: Alexey Dobriyan , Catalin Marinas , Geert Uytterhoeven , Greg Ungerer , John Paul Adrian Glaubitz , Jonathan Corbet , Matt Turner , Meelis Roos , Michael Schmitz , Mike Rapoport , Mike Rapoport , Russell King , Tony Luck , Vineet Gupta , Will Deacon , linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mm@kvack.org, linux-snps-arc@lists.infradead.org Subject: [PATCH v2 13/13] m68k: deprecate DISCONTIGMEM Date: Sun, 1 Nov 2020 19:04:54 +0200 Message-Id: <20201101170454.9567-14-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201101170454.9567-1-rppt@kernel.org> References: <20201101170454.9567-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: Mike Rapoport DISCONTIGMEM was intended to provide more efficient support for systems with holes in their physical address space that FLATMEM did. Yet, it's overhead in terms of the memory consumption seems to overweight the savings on the unused memory map. For a ARAnyM system with 16 MBytes of FastRAM configured, the memory usag= e reported after page allocator initialization is Memory: 23828K/30720K available (3206K kernel code, 535K rwdata, 936K rod= ata, 768K init, 193K bss, 6892K reserved, 0K cma-reserved) and with DISCONTIGMEM disabled and with relatively large hole in the memo= ry map it is: Memory: 23864K/30720K available (3197K kernel code, 516K rwdata, 936K rod= ata, 764K init, 179K bss, 6856K reserved, 0K cma-reserved) Moreover, since m68k already has custom pfn_valid() it is possible to define HAVE_ARCH_PFN_VALID to enable freeing of unused memory map. The minimal size of a hole that can be freed should not be less than MAX_ORDER_NR_PAGES so to achieve more substantial memory savings let m68k also define custom FORCE_MAX_ZONEORDER. With FORCE_MAX_ZONEORDER set to 9 memory usage becomes: Memory: 23880K/30720K available (3197K kernel code, 516K rwdata, 936K rod= ata, 764K init, 179K bss, 6840K reserved, 0K cma-reserved) Signed-off-by: Mike Rapoport --- arch/m68k/Kconfig.cpu | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu index b8884af365ae..3e70fb7a8d83 100644 --- a/arch/m68k/Kconfig.cpu +++ b/arch/m68k/Kconfig.cpu @@ -20,6 +20,7 @@ choice =20 config M68KCLASSIC bool "Classic M68K CPU family support" + select HAVE_ARCH_PFN_VALID =20 config COLDFIRE bool "Coldfire CPU family support" @@ -377,11 +378,34 @@ config SINGLE_MEMORY_CHUNK help Ignore all but the first contiguous chunk of physical memory for VM purposes. This will save a few bytes kernel size and may speed up - some operations. Say N if not sure. + some operations. + When this option os set to N, you may want to lower "Maximum zone + order" to save memory that could be wasted for unused memory map. + Say N if not sure. =20 config ARCH_DISCONTIGMEM_ENABLE + depends on BROKEN def_bool MMU && !SINGLE_MEMORY_CHUNK =20 +config FORCE_MAX_ZONEORDER + int "Maximum zone order" if ADVANCED + depends on !SINGLE_MEMORY_CHUNK + default "11" + help + The kernel memory allocator divides physically contiguous memory + blocks into "zones", where each zone is a power of two number of + pages. This option selects the largest power of two that the kernel + keeps in the memory allocator. If you need to allocate very large + blocks of physically contiguous memory, then you may need to + increase this value. + + For systems that have holes in their physical address space this + value also defines the minimal size of the hole that allows + freeing unused memory map. + + This config option is actually maximum order plus one. For example, + a value of 11 means that the largest free memory block is 2^10 pages. + config 060_WRITETHROUGH bool "Use write-through caching for 68060 supervisor accesses" depends on ADVANCED && M68060 --=20 2.28.0