Messages in this thread | | | Subject | Re: [PATCH 2/3] Documentation: riscv: Add documentation that describes the VM layout | From | Alex Ghiti <> | Date | Thu, 25 Feb 2021 06:56:11 -0500 |
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Le 2/25/21 à 5:34 AM, David Hildenbrand a écrit : > | | | |> + > ffffffc000000000 | -256 GB | ffffffc7ffffffff | 32 GB | kasan >> + ffffffcefee00000 | -196 GB | ffffffcefeffffff | 2 MB | fixmap >> + ffffffceff000000 | -196 GB | ffffffceffffffff | 16 MB | PCI io >> + ffffffcf00000000 | -196 GB | ffffffcfffffffff | 4 GB | vmemmap >> + ffffffd000000000 | -192 GB | ffffffdfffffffff | 64 GB | >> vmalloc/ioremap space >> + ffffffe000000000 | -128 GB | ffffffff7fffffff | 126 GB | >> direct mapping of all physical memory > > ^ So you could never ever have more than 126 GB, correct? > > I assume that's nothing new. >
Before this patch, the limit was 128GB, so in my sense, there is nothing new. If ever we want to increase that limit, we'll just have to lower PAGE_OFFSET, there is still some unused virtual addresses after kasan for example.
Thanks,
Alex
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