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    SubjectRe: [PATCH] x86: fix probe_nr_irqs for xen
    On Thu, Aug 21, 2008 at 4:52 PM, Jeremy Fitzhardinge <jeremy@goop.org> wrote:
    > Yinghai Lu wrote:
    >> On Thu, Aug 21, 2008 at 4:33 PM, Jeremy Fitzhardinge <jeremy@goop.org> wrote:
    >>
    >>> Yinghai Lu wrote:
    >>>
    >>>> otherwise Xen is _completely_ unusable with 5 or more VCPUs.
    >>>> ( when !CONFIG_HAVE_SPARSE_IRQ)
    >>>>
    >>>> based on Alex's patch
    >>>>
    >>>> also add +1 offset after redir_entries
    >>>>
    >>>> Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
    >>>> Cc: Alex Nixon <alex.nixon@citrix.com>
    >>>>
    >>>>
    >>> Looks good to me. We can fix this in a better way later.
    >>>
    >>
    >> later could set CONFIG_HAVE_SPARSE_IRQ to true by default.
    >>
    >
    > Well, perhaps. But we can use vectors rather than IRQs for Xen event
    > channel mappings, which will save us from having to allocate lots of
    > per-cpu irqs.

    like system vectors with smp-ipi etc?

    >
    > Also, implementing probe_nr_irqs() in a more generic (rather than
    > io_apic-specific) way. Using some interface that queries each irq chip
    > for how many irqs it supports, or something.

    hope we can kill nr_irqs/NR_IRQS

    YH


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