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
