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    SubjectRe: latest linus-2.5 BK broken


    On Wed, 19 Jun 2002, Rusty Russell wrote:
    >
    > > That doesn't work. Think of SMT CPU pairs (aka HyperThreading) or
    > > quads that share caches.
    >
    > This is the NUMA "I want to be in this group" problem. If you're
    > serious about this, you'll go for a sys_sched_groupaffinity call, or
    > add an extra arg to sys_sched_setaffinity, or simply use the top 16
    > bits of the cpu arg.

    Oh, yes. That makes sense. NOT.

    > Sorry, the current interface is insufficient for NUMA *and* is
    > impossible[1] for the user to use correctly.

    Don't be silly.

    Give _one_ good reason why the affinity system call cannot take a simple
    bitmask? It's trivial to use, your arguments do not make any sense.

    Linus

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