Re: Patch to reorder functions in the vmlinux to a defined order

Linus Torvalds wrote:

The real issue is the _physical_ address. Nothing else matters.

If the TLB splitting on the fixed MTRRs is an issue, it depends entirely on what physical address the kernel resides in, and the virtual address is totally inconsequential.

So playing games with virtual mapping has absolutely no upsides, and it definitely has downsides.

The notion was that having a fixed virtual mapping of the kernel would allow it to be loaded anywhere physically without needing to do actual address fixups. The bootloader could then for example at runtime decide to load the kernel at 16MB if the machine had enough memory available, to free up ZONE_DMA. Or not do that if running on a <= 16MB machine.

Or the kdump "host" kernel would make that decission, as it seems the want is shared with them. Eric Biederman said that fixups aren't that bad though...

Rene.

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