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    SubjectRe: [PATCH v4 4/4] PCI: Limit pci_alloc_irq_vectors() to housekeeping CPUs
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    On Mon, Oct 26 2020 at 18:22, Nitesh Narayan Lal wrote:
    > On 10/26/20 5:50 PM, Thomas Gleixner wrote:
    >> But I still think that for curing that isolation stuff we want at least
    >> some information from the driver. Alternative solution would be to grant
    >> the allocation of interrupts and queues and have some sysfs knob to shut
    >> down queues at runtime. If that shutdown results in releasing the queue
    >> interrupt (via free_irq()) then the vector exhaustion problem goes away.
    >
    > I think this is close to what I and Marcelo were discussing earlier today
    > privately.
    >
    > I don't think there is currently a way to control the enablement/disablement of
    > interrupts from the userspace.

    You cannot just disable the interrupt. You need to make sure that the
    associated queue is shutdown or quiesced _before_ the interrupt is shut
    down.

    Thanks,

    tglx

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