Author: sephe
Date: Tue Oct 10 08:16:55 2017
New Revision: 324487
URL: https://svnweb.freebsd.org/changeset/base/324487
Log:
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
Modified:
head/sys/dev/hyperv/vmbus/vmbus.c
Modified: head/sys/dev/hyperv/vmbus/vmbus.c
==============================================================================
--- head/sys/dev/hyperv/vmbus/vmbus.c Tue Oct 10 08:07:05 2017
(r324486)
+++ head/sys/dev/hyperv/vmbus/vmbus.c Tue Oct 10 08:16:55 2017
(r324487)
@@ -128,6 +128,13 @@ static void
vmbus_event_proc_dummy(struct vmbus_soft
static struct vmbus_softc *vmbus_sc;
+SYSCTL_NODE(_hw, OID_AUTO, vmbus, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
+ "Hyper-V vmbus");
+
+static int vmbus_pin_evttask = 1;
+SYSCTL_INT(_hw_vmbus, OID_AUTO, pin_evttask, CTLFLAG_RDTUN,
+ &vmbus_pin_evttask, 0, "Pin event tasks to their respective CPU");
+
extern inthand_t IDTVEC(vmbus_isr);
static const uint32_t vmbus_version[] = {
@@ -905,10 +912,16 @@ vmbus_intr_setup(struct vmbus_softc *sc)
VMBUS_PCPU_GET(sc, event_tq, cpu) = taskqueue_create_fast(
"hyperv event", M_WAITOK, taskqueue_thread_enqueue,
VMBUS_PCPU_PTR(sc, event_tq, cpu));
- CPU_SETOF(cpu, &cpu_mask);
- taskqueue_start_threads_cpuset(
- VMBUS_PCPU_PTR(sc, event_tq, cpu), 1, PI_NET, &cpu_mask,
- "hvevent%d", cpu);
+ if (vmbus_pin_evttask) {
+ CPU_SETOF(cpu, &cpu_mask);
+ taskqueue_start_threads_cpuset(
+ VMBUS_PCPU_PTR(sc, event_tq, cpu), 1, PI_NET,
+ &cpu_mask, "hvevent%d", cpu);
+ } else {
+ taskqueue_start_threads(
+ VMBUS_PCPU_PTR(sc, event_tq, cpu), 1, PI_NET,
+ "hvevent%d", cpu);
+ }
/*
* Setup tasks and taskqueues to handle messages.
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