Date: Fri, 13 Oct 2017 04:55:54 +0000 (UTC) From: Sepherosa Ziehau <sephe@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r324576 - stable/11/sys/dev/hyperv/vmbus Message-ID: <201710130455.v9D4ts1D090708@repo.freebsd.org>
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Author: sephe Date: Fri Oct 13 04:55:54 2017 New Revision: 324576 URL: https://svnweb.freebsd.org/changeset/base/324576 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/11/sys/dev/hyperv/vmbus/vmbus.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/dev/hyperv/vmbus/vmbus.c ============================================================================== --- stable/11/sys/dev/hyperv/vmbus/vmbus.c Fri Oct 13 02:29:43 2017 (r324575) +++ stable/11/sys/dev/hyperv/vmbus/vmbus.c Fri Oct 13 04:55:54 2017 (r324576) @@ -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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