From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 47E14606A327 for ; Thu, 12 Nov 2026 12:00:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=mykMNeh5 Received: by kanga.kvack.org (Postfix) id 6DDEB6B05B0; Thu, 12 Nov 2026 07:00:27 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6B60C6B05B1; Thu, 12 Nov 2026 07:00:27 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5F3636B05B9; Thu, 12 Nov 2026 07:00:27 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id E51FF6B05B0 for ; Thu, 12 Nov 2026 07:00:26 -0500 (EST) Received: from smtpin24.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 09DE912057C for ; Thu, 12 Nov 2026 12:00:26 +0000 (UTC) X-FDA: 85426324452.24.E41177A Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf22.hostedemail.com (Postfix) with ESMTP id 6D81FC000F for ; Thu, 12 Nov 2026 12:00:24 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=mykMNeh5; spf=pass (imf22.hostedemail.com: domain of rppt@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1794484824; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=wTN3UxTT/XXw7NH/F07ZSE1+SznsV7bVJZdXlw3Sm0E=; b=5O+XW2RcQkp0irLfIHPki84ucMEZWRiafIlput8lEWnJiJrzfMc2gKXjbgLC89TdzX6eba 9COjo/MqjvHN9uXV3d3kpfUEcCYtKqSnNPmOwoeuLlAEAJbye14gEy8WpJhWyeujDYu/Ub bEyiQGmDxkhoeeIG5pcefAEyACeCrq8= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1794484824; b=AibzNPp0CEEatdQwCOpSg0eJzlPc2+LH3BvtrEZxep0YXsQkk1WoNUQs3ACqf+AiJUJdIZ Obp7MPm4jrOHi9YzgizA/gxVqOOMUhDIPvCout84pyLU+uGo7j/V/3nFPux34jy/sChCit TXTvR19u5AAyx12CPt4XLwx9Av4b49Q= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=mykMNeh5; spf=pass (imf22.hostedemail.com: domain of rppt@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id E06B163950; Thu, 12 Nov 2026 12:00:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 869391F00A05; Thu, 12 Nov 2026 12:00:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794484823; bh=wTN3UxTT/XXw7NH/F07ZSE1+SznsV7bVJZdXlw3Sm0E=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=mykMNeh5BtXxUerEKT1YuKhyGYJ7QWD8IG5KpF4NuP4taMISSoglro4vnkkgm5jw7 WQS/4vwRcKImTEfxhMYZ5wbg4cf0zsqSfNSCuEwHpTxLLpdEiTkzuh28KNZeLAVJNg ZfCkbQmePV1CQjWwx2EMjuLDIhpJighraQGEfBeHC2UHTK/MwHz7f2oBCj4SrVNuE8 h5IIE+hXfIdS625oF8CuXci5blOoZ0531mmkrv2ibJ2+zxzA7PXsQSYWh5mHmJWrB0 v/bWt32FVQ52/8TNJggbPdO6bVuM9pAUdH6G57AlDfNOf/PKeeT3jQZcm5rv//GblC jWyGILzZ6HoIw== Date: Thu, 12 Nov 2026 14:00:11 +0200 From: Mike Rapoport To: Arnd Bergmann Cc: linux-mm@kvack.org, Arnd Bergmann , Andrew Morton , Andreas Larsson , "Christophe Leroy (CS GROUP)" , Dave Hansen , "David Hildenbrand (Arm)" , Jason Gunthorpe , Linus Walleij , "Lorenzo Stoakes (ARM)" , Matthew Wilcox , Malin Jonsson , Richard Weinberger , Russell King , linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Michal Simek , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Nishanth Menon , Lucas Stach Subject: Re: [PATCH v2 5/6] arch/*: increase lowmem size to avoid highmem use Message-ID: References: <20261112112528.1116405-1-arnd@kernel.org> <20261112112528.1116405-6-arnd@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261112112528.1116405-6-arnd@kernel.org> X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS autolearn=unavailable autolearn_force=no version=4.0.1 X-Rspamd-Server: rspam09 X-Stat-Signature: 1ww39q5o3ba8htgc7mtym3hqxk6d5raz X-Rspamd-Queue-Id: 6D81FC000F X-Rspam-User: X-HE-Tag: 1794484824-874486 X-HE-Meta: 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 pDO4dgiD 44f0mp7yO9esuiEUmvoFxxTiSN/elfNF3mephYalJ5QX4WC2LoXdpI8I0h9/ySuujviMqXkxD6TwDQ6VfUHzYaamlmCxtYtFUsuGiuXjXmeyjD3KRKfEV+GNIwM/TWy+KUa7rF7Jyl7Mojp2V2mZ65fHsMcpA+6puWn9XT2saulXRycILUPXP+QB6CQoJEM2/alBa8TGIjahBj6+Mj4jg58tUed76pnrc7ZcOoYvB+tmWZ8ZbAItRaCBjNNx9LmEDvUcCKYO6TUbNjT51hbwP3MKgDgyzSkcEWhr0DnSiEYCz+0o5f6jJIPeNx20AHjNWEhjAwVNG6EjlymWmR7NppBlKyQ066i+rKFLQ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Thu, Nov 12, 2026 at 12:25:27PM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann > > Most of the common 32-bit architectures (x86, arm, powerpc) all use the > default virtual memory layout that was already in place for i386 systems > in the 1990s, using exactly 3GiB of user TASK_SIZE, with the upper 1GiB > of addresses split between (at most 896MiB) lowmem and vmalloc. ... > Based on the above observations and the discussion at the kernel summit, > change the defaults to the most appropriate values: use 1GiB of lowmem on > non-highmem configurations, and either 2GiB or 1.75GiB of lowmem on highmem > builds, depending on what is available on the architecture. > > Signed-off-by: Arnd Bergmann Acked-by: Mike Rapoport (Microsoft) > --- > arch/arm/Kconfig | 5 ++++- > arch/arm/configs/aspeed_g5_defconfig | 1 - > arch/arm/configs/u8500_defconfig | 1 - > arch/arm/configs/vt8500_v6_v7_defconfig | 2 -- > arch/arm/mach-omap2/Kconfig | 1 - > arch/microblaze/Kconfig | 9 ++++++--- > arch/microblaze/configs/mmu_defconfig | 1 - > arch/powerpc/Kconfig | 14 +++++++++----- > arch/powerpc/configs/44x/akebono_defconfig | 1 - > arch/powerpc/configs/85xx/ksi8560_defconfig | 1 - > arch/powerpc/configs/85xx/stx_gp3_defconfig | 1 - > arch/x86/Kconfig | 4 +++- > 12 files changed, 22 insertions(+), 19 deletions(-) -- Sincerely yours, Mike.