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    SubjectRe: [PATCH v2 10/12] Maintain preemptability count even for !CONFIG_PREEMPT kernels
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    On Mon, 2009-11-23 at 16:06 +0200, Gleb Natapov wrote:
    > Do not preempt kernel. Just maintain counter to know if task can be rescheduled.
    > Asynchronous page fault may be delivered while spinlock is held or current
    > process can't be preempted for other reasons. KVM uses preempt_count() to check if preemptions is allowed and schedule other process if possible. This works
    > with preemptable kernels since they maintain accurate information about
    > preemptability in preempt_count. This patch make non-preemptable kernel
    > maintain accurate information in preempt_count too.

    I'm thinking you're going to have to convince some people this won't
    slow them down for no good.

    Personally I always have PREEMPT=y, but other people seem to feel
    strongly about not doing so.



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