On Tue, 3 Apr 2007, Andi Kleen wrote:
If it works I would be inclined to replaced old sparsemem with Christoph's
new one on x86-64. Perhaps that could cut down the bewildering sparsemem
ifdef jungle that is there currently.
But I presume it won't work on 32bit because of the limited address space?
Not in general but it will work in non PAE mode. 4GB need 2^(32-21+4) = 16MB pages. This would require the mapping on 4 4MB pages.
For 64GB you'd need 256M which would be a quarter of low mem. Probably takes up too much of low mem.