From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794484824; b=VxCiW3Q9anBLa6iYLATDVqGEEdbjCX4b9/6mjkGHmhk1PTRENcv+H8mraMftUQdiZsh4 7OHmixLzghEiYmkdbYwkwDOI4tu46C5eu/h/lInEaikrEjYzM6LipX8BHtL/y3Vy763h2 6ygh7+qIS+0El8JAIZq6CKuJxXZDlGFoYQWhUxw7oJDKgmQk2GGBTPNDLPg2f8CvIAZOh Dy61pe2F8Z8OmanfeE7y1Wet+9CWIrEC+c9JbZ8VU359p6ZR9HZuZkqCuN5uXfZYAUMdq TqhEpa7DKUndSnqUAaG/6O/DBUnbs4inEa47X/KgcImdtxV48teg/Quu/vUqqfvOJUw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794484824; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=wTN3UxTT/XXw7NH/F07ZSE1+SznsV7bVJZdXlw3Sm0E=; b=OxCQMxZEc4jp1JRQgsfHEPgWWd4+2dJf48yOeyqhUj7YIjSsmtvhKS+pc8IFHCoR5/L8 7nOCtmNgOTc84/XZw5aSUAVU8EsDwfvV0kr1BYY3Sm8Q1VjUeZZsUwszKK6isrA4fmr2N +NE7FSa5SYgPEG3ZiK7lmF+MVQainmDKFZ3OECxbUQ+eNNWjXA1DRdPth6n7kCF54pIss AoabH2jm4HUHot8wLRWv8zuItzRj/31Cow3cQGdQ3PNlyejLnDm5HWe4PimCFXWlif4Br slMn8KaWW4YrWABI0VoECao1JotfG9sMUopLTqt/ysVbSh5S2IE7BbbjHN6YIEaSjJA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=mykMNeh5; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 24688606A31C for ; Thu, 12 Nov 2026 12:00:23 +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 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-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261112112528.1116405-6-arnd@kernel.org> 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.