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    SubjectRe: top stack (l)users for 2.5.69
    >> Does 2.5 use a separate interrupt stack? (Excuse my ignorance; I 
    >> haven't been paying attention.) Total stack-page usage in the 2.4
    >> model, at any rate, is the sum of the task struct, the usage of any
    >> task-level thread (system calls, pretty much), any softirq (including
    >> the network protocol & routing handlers, and any netfilter modules),
    >> and some number of possibly-nested hard interrupts.
    >
    > Depends on the architecture. s390 does, ppc didn't as of 2.4.2, the
    > rest I'm not sure about. But this is another requirement for stack
    > reduction to 4k for most platforms, if not all.

    There are patches to make i386 do this (and use 4K stacks as a config option)
    from Dave Hansen and Ben LaHaise in 2.5-mjb tree.

    >> One thing that would help (aside from separate interrupt stacks)
    >> would be a guard page below the stack. That wouldn't require any
    >> physical memory to be reserved, and would provide positive indication
    >> of stack overflow without significant runtime overhead.
    >
    > Yes, that should work. It needs some additional code in the page fault
    > handler to detect this case, but that shouldn't slow the system down
    > too much.

    There's stack overflow detection in there as well.

    M.

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