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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 2ED88C2BA83 for ; Wed, 12 Feb 2020 08:50:38 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B948320661 for ; Wed, 12 Feb 2020 08:50:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b="1GpmvKdE" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B948320661 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=armlinux.org.uk Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 292436B0409; Wed, 12 Feb 2020 03:50:37 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 21BE66B040B; Wed, 12 Feb 2020 03:50:37 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0BCC86B040C; Wed, 12 Feb 2020 03:50:37 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0175.hostedemail.com [216.40.44.175]) by kanga.kvack.org (Postfix) with ESMTP id E2C146B0409 for ; Wed, 12 Feb 2020 03:50:36 -0500 (EST) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 7625F52CC for ; Wed, 12 Feb 2020 08:50:36 +0000 (UTC) X-FDA: 76480854072.12.veil19_3f56620d7f84d X-HE-Tag: veil19_3f56620d7f84d X-Filterd-Recvd-Size: 4901 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) by imf42.hostedemail.com (Postfix) with ESMTP for ; Wed, 12 Feb 2020 08:50:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=NpTlCgYb/z6Vi+BVrieZmKjPIGNXZC/UxztwFhX/oFk=; b=1GpmvKdEeXdDZ/5zRSW5wO/Ao nIujDFAzKzE3wq0D2nTcxVjtYyGVdgu1Jd5MgAcflDcQotS08VoIoR0OIO/fNaU0VVhPk8cID0BAL QEAkby765VihaP7Gjoam3MhHORaKOqUuSWkPj7RvVZXr+I34PhC2m7RFnanmtkN8r7DQrlrm1G7DI ArD1iqCp0xPVPiIUKYD+Gob2cBT0UT4YUKEWG2R3mNUdWaA7FXqEQd2nGm4WtJhllzYfyZE9AYJUT TA43u+2ZLmgsFKARTkcG9MICatJ953z6e8k5lEgMM03lkQDPJkMtQjKyp7zW/IwKFqKSCHzzLLK0G 0D0f9OELg==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:50926) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1j1nim-0001dz-8f; Wed, 12 Feb 2020 08:50:12 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1j1nie-0001HG-SN; Wed, 12 Feb 2020 08:50:04 +0000 Date: Wed, 12 Feb 2020 08:50:04 +0000 From: Russell King - ARM Linux admin To: Linus Torvalds Cc: Andrew Morton , Linux ARM , Catalin Marinas , Johannes Weiner , Rik van Riel , linux-fsdevel , Linux-MM , Linux Kernel Mailing List , Dave Chinner , Yafang Shao , Michal Hocko , Roman Gushchin , Al Viro , kernel-team@fb.com Subject: Re: [PATCH] vfs: keep inodes with page cache off the inode shrinker LRU Message-ID: <20200212085004.GL25745@shell.armlinux.org.uk> References: <20200211175507.178100-1-hannes@cmpxchg.org> <29b6e848ff4ad69b55201751c9880921266ec7f4.camel@surriel.com> <20200211193101.GA178975@cmpxchg.org> <20200211154438.14ef129db412574c5576facf@linux-foundation.org> <20200211164701.4ac88d9222e23d1e8cc57c51@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) 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 Tue, Feb 11, 2020 at 05:03:02PM -0800, Linus Torvalds wrote: > On Tue, Feb 11, 2020 at 4:47 PM Andrew Morton wrote: > > > > What's the situation with highmem on ARM? > > Afaik it's exactly the same as highmem on x86 - only 32-bit ARM ever > needed it, and I was ranting at some people for repeating all the > mistakes Intel did. > > But arm64 doesn't need it, and while 32-bit arm is obviosuly still > selling, I think that in many ways the switch-over to 64-bit has been > quicker on ARM than it was on x86. Partly because it happened later > (so all the 64-bit teething pains were dealt with), but largely > because everybody ended up actively discouraging 32-bit on the Android > side. > > There were a couple of unfortunate early 32-bit arm server attempts, > but they were - predictably - complete garbage and nobody bought them. > They don't exist any more. > > So at least my gut feel is that the arm people don't have any big > reason to push for maintaining HIGHMEM support either. > > But I'm adding a couple of arm people and the arm list just in case > they have some input. > > [ Obvious background for newly added people: we're talking about > making CONFIG_HIGHMEM a deprecated feature and saying that if you want > to run with lots of memory on a 32-bit kernel, you're doing legacy > stuff and can use a legacy kernel ] Well, the recent 32-bit ARM systems generally have more than 1G of memory, so make use of highmem as a rule. You're probably talking about crippling support for any 32-bit ARM system produced in the last 8 to 10 years. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up