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    SubjectRe: [PATCH ] VMSPLIT config options (with default config fixed)
    >> glad to see that the linux kernel is now ready for the 'idea'
    >> I submitted a patch[1] for, more than a year ago -- which
    >> unfortunately went unnoticed back then ...

    BTW, I patched my local 2.6.16-rc1 with that patch and I run off
    VMSPLIT_3G_OPT quite well without problems. (Well, VMware gets it wrong, as
    usual, but nothing that I could not solved.) Even though I do not even have
    1 G but just 768 ;-)

    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...")

    >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"

    depends on VMSPLIT_X
    default 0xC0000000
    prompt "Memory split address (must be aligned to 4096)"

    And in include/asm/page.h:

    #define __PAGE_OFFSET ((unsigned long)CONFIG_VMSPLIT_MANUAL)
    #define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)

    Not perfect, but a start.

    Jan Engelhardt
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      Last update: 2006-02-02 21:58    [W:0.133 / U:7.720 seconds]
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