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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: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , Precedence: list 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=ham autolearn_force=no version=4.0.1 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.