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    SubjectRe: [PATCH 1/3] dynticks - implement no idle hz for x86
    On Mon, Sep 05, 2005 at 11:02:25AM +0530, Srivatsa Vaddagiri wrote:
    > I don't see provisions for all these in the current ARM implementation.

    That's because, like x86, we've been ignoring each other. ARM
    doesn't handle dyntick SMP yet - ARM is fairly young as far as
    SMP issues goes, and as yet doesn't include a full SMP
    implementation in mainline.

    Despite that, the timers as implemented on the hardware are not
    suitable for dyntick use - attempting to use them, you lose long
    term precision of the timer interrupts.

    > 5. Don't see how DYN_TICK_SKIPPING is being used. In SMP scenario,
    > it doesnt make sense since it will have to be per-cpu. The bitmap
    > that I talked of exactly tells that (whether a CPU is skipping
    > ticks or not).

    What's DYN_TICK_SKIPPING and what's it used for? It looks like
    a redundant definition left over from Tony's original implementation.

    --
    Russell King
    Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
    maintainer of: 2.6 Serial core
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