If the scheduler is set before vCPU0 cannot be moved into its cpu,cpuacct cgroup. While it is not yet known whether this is a bug or not, it makes sense for us to do that later as otherwise the scheduler would be inherited by vCPU and I/O Threads even when they do not have any such setting specified. Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com&gt; --- src/qemu/qemu_process.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index 90466771cd87..fa5909e9bed3 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -2658,8 +2658,9 @@ qemuProcessSetupPid(virDomainObjPtr vm, if (use_cpumask && virProcessSetAffinity(pid, use_cpumask) < 0) goto cleanup; - /* Set scheduler type and priority. */ + /* Set scheduler type and priority, but not for the main thread. */ if (sched && + nameval != VIR_CGROUP_THREAD_EMULATOR && virProcessSetScheduler(pid, sched->policy, sched->priority) < 0) goto cleanup; @@ -6773,6 +6774,13 @@ qemuProcessLaunch(virConnectPtr conn, if (qemuProcessSetupIOThreads(vm) < 0) goto cleanup; + VIR_DEBUG("Setting emulator scheduler"); + if (vm->def->cputune.emulatorsched && + virProcessSetScheduler(vm->pid, + vm->def->cputune.emulatorsched->policy, + vm->def->cputune.emulatorsched->priority) < 0) + goto cleanup; + VIR_DEBUG("Setting any required VM passwords"); if (qemuProcessInitPasswords(driver, vm, asyncJob) < 0) goto cleanup; -- 2.21.0