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Code Issues Releases Activity

hyperv/vmbus: Add tunable to pin/unpin event tasks.

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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
This commit is contained in:
Sepherosa Ziehau 2017-10-10 08:16:55 +00:00
parent 5b347b28cd
commit 8dc07838db
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=324487
1 changed files with 17 additions and 4 deletions
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21
sys/dev/hyperv/vmbus/vmbus.c
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@ -128,6 +128,13 @@ static void vmbus_event_proc_dummy(struct vmbus_softc *,
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.