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    Subject4k stacks
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    Yesterday I sent a patch to add stack-poison so the stack usage
    could be observed.

    Today I wrote a small program and tested the stack usage. Both
    the program and the patch is attached. The result is:

    Offset : 2ec8f000 Available Stack bytes = 3104
    Offset : 2ecb1000 Available Stack bytes = 3104
    Offset : 2ee5f000 Available Stack bytes = 20
    Offset : 2f36d000 Available Stack bytes = 3104
    Offset : 2fd09000 Available Stack bytes = 3012
    Offset : 2fd0b000 Available Stack bytes = 3312
    Offset : 2fd0f000 Available Stack bytes = 2132
    Offset : 2fd2f000 Available Stack bytes = 2744
    Offset : 2fd57000 Available Stack bytes = 2900
    Offset : 2fdd5000 Available Stack bytes = 1400
    Offset : 2fe35000 Available Stack bytes = 2832
    Offset : 2ff3f000 Available Stack bytes = 776
    Offset : 2ff45000 Available Stack bytes = 3188

    This, after compiling the kernel. I did not have 4k stacks
    enabled for this test so any crashing of the stack beyond
    one page will not hurt the system. This was on linux-2.6.13.4.

    Anyway, I tried to enable 4k stacks and the machine would
    not boot past trying to install the first module. It just
    stopped with the interrupts disabled. So, I am now rebuilding
    the kernel back as I write this. That's why I am using 2.6.13
    at the moment.

    Anyway, getting down to 20 bytes of stack-space available
    seems to be pretty scary.


    Cheers,
    Dick Johnson
    Penguin : Linux version 2.6.13 on an i686 machine (5589.54 BogoMips).
    Warning : 98.36% of all statistics are fiction.


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