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    SubjectRe: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

    * Davide Libenzi <davidel@xmailserver.org> wrote:

    > [...] We're still missing proper FPU context switch in the
    > move_user_context(). [...]

    yeah - i'm starting to be of the opinion that the FPU context should
    stay with the threadlet, exclusively. I.e. when calling a threadlet, the
    'outer loop' (the event loop) should not leak FPU context into the
    threadlet and then expect it to be replicated from whatever random point
    the threadlet ended up sleeping at. It would be possible, but it just
    makes no sense. What makes most sense is to just keep the FPU context
    with the threadlet, and to let the 'new head' use an initial (unused)
    FPU context. And it's in fact the threadlet that will most likely have
    an acrive FPU context across a system call, not the outer loop. In other
    words: no special FPU support needed at all for threadlets (i.e. no
    flipping needed even) - this behavior just naturally happens in the
    current implementation. Hm?

    Ingo
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