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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 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-Disposition: inline In-Reply-To: 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-20200212_005028_436933_5CF5141A X-CRM114-Status: GOOD ( 16.46 ) 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: Michal Hocko , Rik van Riel , Catalin Marinas , kernel-team@fb.com, Dave Chinner , Linux Kernel Mailing List , Linux-MM , Yafang Shao , Al Viro , Johannes Weiner , linux-fsdevel , Andrew Morton , Roman Gushchin , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel