Author: sephe
Date: Fri Oct 13 02:01:03 2017
New Revision: 324572
URL: https://svnweb.freebsd.org/changeset/base/324572
Log:
MFC 324487
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.
Sponsored by: Microsoft
Modified:
stable/10/sys/dev/hyperv/vmbus/vmbus.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/hyperv/vmbus/vmbus.c
==============================================================================
--- stable/10/sys/dev/hyperv/vmbus/vmbus.c Thu Oct 12 21:58:51 2017
(r324571)
+++ stable/10/sys/dev/hyperv/vmbus/vmbus.c Fri Oct 13 02:01:03 2017
(r324572)
@@ -129,6 +129,13 @@ static struct vmbus_softc *vmbus_sc;
extern inthand_t IDTVEC(rsvd), IDTVEC(vmbus_isr);
+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");
+
static const uint32_t vmbus_version[] = {
VMBUS_VERSION_WIN8_1,
VMBUS_VERSION_WIN8,
@@ -978,13 +985,15 @@ vmbus_intr_setup(struct vmbus_softc *sc)
taskqueue_start_threads(VMBUS_PCPU_PTR(sc, event_tq, cpu),
1, PI_NET, "hvevent%d", cpu);
- CPU_SETOF(cpu, &cpu_mask);
- TASK_INIT(&cpuset_task, 0, vmbus_cpuset_setthread_task,
- &cpu_mask);
- taskqueue_enqueue(VMBUS_PCPU_GET(sc, event_tq, cpu),
- &cpuset_task);
- taskqueue_drain(VMBUS_PCPU_GET(sc, event_tq, cpu),
- &cpuset_task);
+ if (vmbus_pin_evttask) {
+ CPU_SETOF(cpu, &cpu_mask);
+ TASK_INIT(&cpuset_task, 0, vmbus_cpuset_setthread_task,
+ &cpu_mask);
+ taskqueue_enqueue(VMBUS_PCPU_GET(sc, event_tq, cpu),
+ &cpuset_task);
+ taskqueue_drain(VMBUS_PCPU_GET(sc, event_tq, cpu),
+ &cpuset_task);
+ }
/*
* Setup tasks and taskqueues to handle messages.
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