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qemu: Set emulator thread scheduler only after QEMU starts

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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@redhat.com>
This commit is contained in:
Martin Kletzander 2019-05-22 10:40:58 +02:00
parent b3908d2efb
commit c67a3c0fc3
1 changed files with 9 additions and 1 deletions
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10
src/qemu/qemu_process.c
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@ -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;