hyperv/vmbus: Add tunable to pin/unpin event tasks.
Event tasks are pinned to their respective CPU by default, in the same fashion as they were. Unpin the event tasks by setting hw.vmbus.pin_evttask to 0, if certain CPUs serve special purpose. MFC after: 3 days Sponsored by: Microsoft
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5b347b28cd
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8dc07838db
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=324487
@ -128,6 +128,13 @@ static void vmbus_event_proc_dummy(struct vmbus_softc *,
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static struct vmbus_softc *vmbus_sc;
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SYSCTL_NODE(_hw, OID_AUTO, vmbus, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
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"Hyper-V vmbus");
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static int vmbus_pin_evttask = 1;
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SYSCTL_INT(_hw_vmbus, OID_AUTO, pin_evttask, CTLFLAG_RDTUN,
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&vmbus_pin_evttask, 0, "Pin event tasks to their respective CPU");
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extern inthand_t IDTVEC(vmbus_isr);
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static const uint32_t vmbus_version[] = {
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@ -905,10 +912,16 @@ vmbus_intr_setup(struct vmbus_softc *sc)
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VMBUS_PCPU_GET(sc, event_tq, cpu) = taskqueue_create_fast(
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"hyperv event", M_WAITOK, taskqueue_thread_enqueue,
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VMBUS_PCPU_PTR(sc, event_tq, cpu));
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CPU_SETOF(cpu, &cpu_mask);
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taskqueue_start_threads_cpuset(
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VMBUS_PCPU_PTR(sc, event_tq, cpu), 1, PI_NET, &cpu_mask,
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"hvevent%d", cpu);
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if (vmbus_pin_evttask) {
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CPU_SETOF(cpu, &cpu_mask);
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taskqueue_start_threads_cpuset(
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VMBUS_PCPU_PTR(sc, event_tq, cpu), 1, PI_NET,
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&cpu_mask, "hvevent%d", cpu);
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} else {
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taskqueue_start_threads(
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VMBUS_PCPU_PTR(sc, event_tq, cpu), 1, PI_NET,
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"hvevent%d", cpu);
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}
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/*
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* Setup tasks and taskqueues to handle messages.
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