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SubjectRe: [PATCH ] VMSPLIT config options (with default config fixed)
Jan Engelhardt wrote:
> This sort of testing reminds me of Linus's 100->1000 Hz change
> ("I chose 1000 originally partly as a way to make sure that people that
> assumed HZ was 100 would get a swift kick in the pants.")
> Could we also do that with VMSPLIT?
> ("Let's choose VMSPLIT_2G to make sure that i386-people that assumed
> PAGE_OFFSET was 0xC0000000 would get...")

Mmm.. bad idea. As much as I'd like the default to be 3GB_OPT, that would
be a big impact to userspace, and there's no point in breaking everyone's
machines when advanced users can just reconfig/recompile to get what they want.

>> Hm, I wonder if we could have a more fine-grained choice of the
>> boundary? There are also systems around with e.g. 1.25G or 1.5G of
>> main memory.
> Maybe something like:
> config VMSPLIT_1G
> bool "1G/3G user/kernel split"
> config VMSPLIT_X
> bool "Manual split"
> endchoice

Yes, that looks like a good idea.

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