There isnt enough address space for vmalloc to grab 256Mb. If you want
that much then you need to handle the fact its in page arrays not
virtually linear yourself.
> Yes. See /proc/kcore for a very obvious example. Also "Linux device
> drivers second edition" has many good exmaple on the subject in the
> chapter devoted to mmap.
A better worked example for large volumes of memory might be
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