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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BE6FECCA470 for ; Mon, 6 Oct 2025 20:15:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:Subject:References:In-Reply-To:Message-ID:Cc: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=LhjB5H9mrCqOGAXj5HXNdyEVYPj6mQQyTvJX1KEHiMI=; b=cQ61h3kkoJLvu55QHj7qKISQtE jCT42r/nSAAZTHMePBBg8PeWdXt+GcCwDDBPdTlGsvc5AZrNMsU9fl337S4qIMWaSZ4Gn/un9JUq2 haEGTKM0QtOH58iESEotY/tb6Sn/AEOjVeI6Or8a2T2VuYsO21Ke2vZrr17Mqx52IeUBv0ChU8XKD 1IEXeCRB8vSy2OXkrbAmKWKH4u2FcfEoqet/WcCwk8k8vSu/D7U16DMzOpO8Xbxor6URHWnPGRZYH f1Vt7Fc/B85S70ybXL6v37fVPueZIZi4zvKXkyY77n38rbr17VbssbrnjOReklGuL8bhdnAcJNb3a X4mcBpew==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v5rcQ-00000000imP-0lGz; Mon, 06 Oct 2025 20:15:38 +0000 Received: from mailout.nod.at ([116.203.167.152] helo=lithops.sigma-star.at) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v5rcN-00000000ikJ-2lLO for linux-arm-kernel@lists.infradead.org; Mon, 06 Oct 2025 20:15:36 +0000 Received: from localhost (localhost [127.0.0.1]) by lithops.sigma-star.at (Postfix) with ESMTP id 853FF2B4F9D; Mon, 6 Oct 2025 22:15:23 +0200 (CEST) Received: from lithops.sigma-star.at ([127.0.0.1]) by localhost (lithops.sigma-star.at [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id JD4v2hnJ6q9P; Mon, 6 Oct 2025 22:15:22 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by lithops.sigma-star.at (Postfix) with ESMTP id 0C4012B03C9; Mon, 6 Oct 2025 22:15:22 +0200 (CEST) Received: from lithops.sigma-star.at ([127.0.0.1]) by localhost (lithops.sigma-star.at [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id j6VbrBHYDJpt; Mon, 6 Oct 2025 22:15:21 +0200 (CEST) Received: from lithops.sigma-star.at (lithops.sigma-star.at [195.201.40.130]) by lithops.sigma-star.at (Postfix) with ESMTP id B486A2ABFC1; Mon, 6 Oct 2025 22:15:21 +0200 (CEST) Date: Mon, 6 Oct 2025 22:15:21 +0200 (CEST) From: Richard Weinberger To: Arnd Bergmann Cc: Dave Hansen , ksummit , linux-kernel , linux-arm-kernel , linuxppc-dev , linux-mips , linux-mm , imx , Christophe Leroy , Lucas Stach , Linus Walleij , Geert Uytterhoeven , Ankur Arora , David Hildenbrand , Mike Rapoport , Lorenzo Stoakes , Matthew Wilcox , Andrew Morton , "Liam R. Howlett" , vbabka , Suren Baghdasaryan , Ira Weiny , Nishanth Menon , heiko , Alexander Sverdlin , "Chester A. Unal" , Sergio Paracuellos , Andreas Larsson Message-ID: <1190290449.3827.1759781721487.JavaMail.zimbra@nod.at> In-Reply-To: <4fcd272f-81e3-4729-922b-588ad144e39b@app.fastmail.com> References: <4ff89b72-03ff-4447-9d21-dd6a5fe1550f@app.fastmail.com> <497308537.21756.1757513073548.JavaMail.zimbra@nod.at> <640041197.22387.1757536385810.JavaMail.zimbra@nod.at> <4fcd272f-81e3-4729-922b-588ad144e39b@app.fastmail.com> Subject: Re: [TECH TOPIC] Reaching consensus on CONFIG_HIGHMEM phaseout MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [195.201.40.130] X-Mailer: Zimbra 8.8.12_GA_3807 (ZimbraWebClient - FF141 (Linux)/8.8.12_GA_3809) Thread-Topic: Reaching consensus on CONFIG_HIGHMEM phaseout Thread-Index: 4qe/Jvt6A7Z6bNoIFm3Eugvg7UbUaA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251006_131535_835126_F3EC406F X-CRM114-Status: UNSURE ( 8.50 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org ----- Urspr=C3=BCngliche Mail ----- > Von: "Arnd Bergmann" >>> Has anybody run into actual end user visible problems when using one of >>> weirdo PAGE_OFFSET configs? >> >> In the past I saw that programs such as the Java Runtime (JRE) ran into >> address space limitations due to a 2G/2G split on embedded systems. >> Reverting to a 3G/1G split fixed the problems. >=20 > Right, that makes sense, given the tricks they likely play on the > virtual address space. Are the 2GB devices you maintain using a JRE, > or was this on other embedded hardware? How common is Java still in > this type of workload? Sorry for the late reply, I was on vacation. No, the devices with the JRE issues are from a different customer. Since I work as a consultant lots of strange issues get thrown my way I wouldn't say Java is super common but I still see it from time to time. =20 Thanks, //richard