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    SubjectRe: [PATCH] I3 sched tweaks...
    Ingo Molnar writes:

    > It's
    > slightly cheaper to pass an already existing (calculated) 'current'
    > pointer over to another function, instead of calculating it once more in
    > that function.

    On x86 that's true; many other architectures - alpha, ia64, m68k,
    mips, mips64, parisc, ppc, ppc64, sparc, sparc64 - keep current in a
    register already and thus it is slightly more expensive to pass it as
    a parameter instead of just using current in the function.

    Either way surely the cost is tiny, and the maintainability
    considerations should prevail. Having a function which takes a
    task_struct * parameter which _has_ to be current sounds to me like an
    invitation for somebody to get it wrong down the track.

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      Last update: 2005-03-22 13:23    [W:0.020 / U:11.048 seconds]
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