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    SubjectRe: [PATCH 2/11] x86: convert to generic helpers for IPI function calls

    * Linus Torvalds <torvalds@linux-foundation.org> wrote:

    >
    > [ Ingo added to cc, since this is x86-specific ]
    >
    > On Tue, 22 Apr 2008, Jens Axboe wrote:
    > > +++ b/arch/x86/kernel/apic_32.c
    > > @@ -1357,6 +1357,10 @@ void __init smp_intr_init(void)
    > >
    > > /* IPI for generic function call */
    > > set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
    > > +
    > > + /* IPI for single call function */
    > > + set_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
    > > + call_function_single_interrupt);
    >
    > Ok, one more comment..
    >
    > Why bother with separate vectors for this?

    this was my first question a month ago when Jens/Nick first submitted it
    :)

    > Or is it just a performance optimization? [...]

    yes and i gave in - Nick and Jens wants to do some crazy stuff and they
    had the numbers. Here's the previous discussion:

    http://lkml.org/lkml/2008/2/27/125

    Ingo


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