Who sais it should be taken from user address space?
For example openunix takes a small (I think 4MB) part of the normal KVA
to be per-process mapped.
> I think you're missing the problem with mainline. There is no shortage
> of virtual address space, there is a shortage of physical ram in the
> zone normal. So we cannot keep them in zone normal (and there's no such
> thing as "mapping in zone_normal"). Maybe I misunderstood what you were
The problem is not the 4GB ZONE_NORMAL but the ~1GB KVA space.
UnixWare/OpenUnix had huge problems getting all kernel structs for managing
16GB virtual into that - on the other hand their struct page is more
then twice as big as ours..
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