Re: 2G memory split

[Ingo Molnar]

* Jens Axboe <axboe@xxxxxxx> wrote:

> Hi,
> 
> It does annoy me that any 1G i386 machine will end up with 1/8th of 
> the memory as highmem. A patch like this one has been used in various 
> places since the early 2.4 days at least, is there a reason why it 
> isn't merged yet? Note I just hacked this one up, but similar patches 
> abound I'm sure. Bugs are mine.

yes, i made it totally configurable in 2.4 days: 1:3, 2/2 and 3:1 splits 
were possible. It was a larger patch to enable all this across x86, but 
the Kconfig portion was removed a bit later because people _frequently_ 
misconfigured their kernels and then complained about the results.

so for now the trivial solution is to change the "C" to "8" in the 
following line in include/asm-i386/page.h:

>  #define __PAGE_OFFSET		(0xC0000000)

instead of editing your .config :-)

Maybe we could try the Kconfig solution again, but it'll need alot 
better documentation, dependency on KERNEL_DEBUG and some heavy warnings 
all around.

	Ingo
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