> But from my understanding, Linux (at least v2.0.X) does not have such
> feature (vremap() with cache attribute control).
you can do it under 2.0 too, just check out the code in
drivers/char/mem.c:
/*
* hmm.. This disables high-memory caching, as the XFree86 team
* wondered about that at one time.
* The surround logic should disable caching for the high device
* addresses anyway, but right now this seems still needed.
*/
if (x86 > 3 && vma->vm_offset >= high_memory)
pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
2.1 has more explicit (and platform-independent) support for this.
-- mingo
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