Re: [RFC] [PATCH] virtual memmap on sparsemem v3 [0/4] introduction

[Heiko Carstens]

> Virtual mem_map is not useful for 32bit archs. This uses huge virtual
> address range.

Why? The s390 vmem_map implementation which I sent last week to linux-mm
is merged in the meantime. It supports both 32 and 64 bit.
The main reason is to keep things simple and avoid #ifdef hell.

Since the maximum size of the virtual array is  about 16MB it's not much
waste of address space. Actually I just changed the size of the vmalloc
area, so that the maximum supported physical amount of memory is still 1920MB.
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