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| author | sephe <sephe@FreeBSD.org> | 2017-10-13 04:55:54 +0000 |
|---|---|---|
| committer | Luiz Souza <luiz@netgate.com> | 2018-02-19 14:51:48 -0300 |
| commit | 39eb19ab2b6c1de1c3864ee90d8570fca27edaff (patch) | |
| tree | 03436f3e88a9e8874eaa9c3d1312ae71da2ae259 | |
| parent | cbd1eed96e34173b1f65e50333ea628a0db27366 (diff) | |
| download | FreeBSD-src-39eb19ab2b6c1de1c3864ee90d8570fca27edaff.zip FreeBSD-src-39eb19ab2b6c1de1c3864ee90d8570fca27edaff.tar.gz | |
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
(cherry picked from commit 9cb4809ce143d4b9253bda2ec391079de7ea3f2c)
| -rw-r--r-- | sys/dev/hyperv/vmbus/vmbus.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/sys/dev/hyperv/vmbus/vmbus.c b/sys/dev/hyperv/vmbus/vmbus.c index dc924d0..e8c683f 100644 --- a/sys/dev/hyperv/vmbus/vmbus.c +++ b/sys/dev/hyperv/vmbus/vmbus.c @@ -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. |
