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    SubjectRe: [V6][PATCH 4/6] x86, nmi: add in logic to handle multiple events and unknown NMIs
    On Sun, Oct 02, 2011 at 12:07:16PM +0200, Avi Kivity wrote:
    > >Right. Avi, Jeremy what was your objection that needed this optimization
    > >in the first place?
    > >
    >
    > First, iterating over all NMI sources is going to be slow, and a lot
    > more so in a guest. This reduces the performance of perf.

    I understand and agree. The only positive I can offer is most machines
    will most likely only have two NMI handlers registered: perf and
    arch_backtrace. So any slowness should be minimal. We might even be able
    to code up arch_backtrace to register its NMI handler when it is called to
    minimize the the number of NMI sources even more.

    Cheers,
    Don

    >
    > Second, I wanted to use NMIs as a way of waking up a vcpu sleeping
    > with interrupts disabled (in the context of Jeremy's paravirt
    > spinlock patches). Looks like we'll have to use paravirtualization
    > for that.


    >
    > --
    > error compiling committee.c: too many arguments to function
    >


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