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qemu: Add qemuProcessSetupPid() and use it in qemuProcessSetupIOThread()
Setting up cgroups and other things for all kinds of threads (the emulator thread, vCPU threads, I/O threads) was copy-pasted every time new thing was added. Over time each one of those functions changed a bit differently. So create one function that does all that setup and start using it, starting with I/O thread setup. That will shave some duplicated code and maybe fix some bugs as well. Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Martin Kletzander
parent
ed1fbd7c5b
commit
71e419bbeb
@ -2304,6 +2304,114 @@ qemuProcessSetLinkStates(virQEMUDriverPtr driver,
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}
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/**
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* qemuProcessSetupPid:
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*
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* This function sets resource properities (affinity, cgroups,
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* scheduler) for any PID associated with a domain. It should be used
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* to set up emulator PIDs as well as vCPU and I/O thread pids to
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* ensure they are all handled the same way.
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*
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* Returns 0 on success, -1 on error.
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*/
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static int
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qemuProcessSetupPid(virDomainObjPtr vm,
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pid_t pid,
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virCgroupThreadName nameval,
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int id,
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virBitmapPtr cpumask,
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unsigned long long period,
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long long quota,
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virDomainThreadSchedParamPtr sched)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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virDomainNumatuneMemMode mem_mode;
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virCgroupPtr cgroup = NULL;
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virBitmapPtr use_cpumask;
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char *mem_mask = NULL;
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int ret = -1;
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if ((period || quota) &&
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!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU)) {
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virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
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_("cgroup cpu is required for scheduler tuning"));
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goto cleanup;
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}
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/* Infer which cpumask shall be used. */
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if (cpumask)
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use_cpumask = cpumask;
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else if (vm->def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)
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use_cpumask = priv->autoCpuset;
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else
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use_cpumask = vm->def->cpumask;
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/*
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* If CPU cgroup controller is not initialized here, then we need
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* neither period nor quota settings. And if CPUSET controller is
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* not initialized either, then there's nothing to do anyway.
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*/
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if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU) ||
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virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
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if (virDomainNumatuneGetMode(vm->def->numa, -1, &mem_mode) == 0 &&
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mem_mode == VIR_DOMAIN_NUMATUNE_MEM_STRICT &&
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virDomainNumatuneMaybeFormatNodeset(vm->def->numa,
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priv->autoNodeset,
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&mem_mask, -1) < 0)
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goto cleanup;
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if (virCgroupNewThread(priv->cgroup, nameval, id, true, &cgroup) < 0)
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goto cleanup;
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if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
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if (use_cpumask &&
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qemuSetupCgroupCpusetCpus(cgroup, use_cpumask) < 0)
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goto cleanup;
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/*
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* Don't setup cpuset.mems for the emulator, they need to
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* be set up after initialization in order for kvm
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* allocations to succeed.
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*/
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if (nameval != VIR_CGROUP_THREAD_EMULATOR &&
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mem_mask && virCgroupSetCpusetMems(cgroup, mem_mask) < 0)
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goto cleanup;
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}
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if ((period || quota) &&
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qemuSetupCgroupVcpuBW(cgroup, period, quota) < 0)
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goto cleanup;
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/* Move the thread to the sub dir */
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if (virCgroupAddTask(cgroup, pid) < 0)
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goto cleanup;
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}
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/* Setup legacy affinity. */
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if (use_cpumask && virProcessSetAffinity(pid, use_cpumask) < 0)
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goto cleanup;
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/* Set scheduler type and priority. */
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if (sched &&
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virProcessSetScheduler(pid, sched->policy, sched->priority) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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VIR_FREE(mem_mask);
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if (cgroup) {
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if (ret < 0)
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virCgroupRemove(cgroup);
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virCgroupFree(&cgroup);
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}
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return ret;
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}
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static int
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qemuProcessSetupEmulator(virDomainObjPtr vm)
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{
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@ -4704,98 +4812,18 @@ qemuProcessSetupVcpus(virDomainObjPtr vm)
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}
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/**
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* qemuProcessSetupIOThread:
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* @vm: domain object
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* @iothread: iothread data structure to set the data for
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*
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* This function sets resource properities (affinity, cgroups, scheduler) for a
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* IOThread. This function expects that the IOThread is online and the IOThread
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* pids were correctly detected at the point when it's called.
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*
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* Returns 0 on success, -1 on error.
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*/
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int
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qemuProcessSetupIOThread(virDomainObjPtr vm,
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virDomainIOThreadIDDefPtr iothread)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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unsigned long long period = vm->def->cputune.period;
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long long quota = vm->def->cputune.quota;
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virDomainNumatuneMemMode mem_mode;
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char *mem_mask = NULL;
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virCgroupPtr cgroup_iothread = NULL;
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virBitmapPtr cpumask = NULL;
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int ret = -1;
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if ((period || quota) &&
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!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU)) {
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virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
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_("cgroup cpu is required for scheduler tuning"));
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return -1;
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}
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if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU) ||
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virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
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if (virDomainNumatuneGetMode(vm->def->numa, -1, &mem_mode) == 0 &&
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mem_mode == VIR_DOMAIN_NUMATUNE_MEM_STRICT &&
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virDomainNumatuneMaybeFormatNodeset(vm->def->numa,
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priv->autoNodeset,
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&mem_mask, -1) < 0)
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goto cleanup;
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if (virCgroupNewThread(priv->cgroup, VIR_CGROUP_THREAD_IOTHREAD,
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return qemuProcessSetupPid(vm, iothread->thread_id,
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VIR_CGROUP_THREAD_IOTHREAD,
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iothread->iothread_id,
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true, &cgroup_iothread) < 0)
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goto cleanup;
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}
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if (iothread->cpumask)
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cpumask = iothread->cpumask;
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else if (vm->def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)
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cpumask = priv->autoCpuset;
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else
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cpumask = vm->def->cpumask;
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if (period || quota) {
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if (qemuSetupCgroupVcpuBW(cgroup_iothread, period, quota) < 0)
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goto cleanup;
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}
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if (cgroup_iothread) {
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if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
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if (mem_mask &&
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virCgroupSetCpusetMems(cgroup_iothread, mem_mask) < 0)
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goto cleanup;
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if (cpumask &&
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qemuSetupCgroupCpusetCpus(cgroup_iothread, cpumask) < 0)
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goto cleanup;
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}
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if (virCgroupAddTask(cgroup_iothread, iothread->thread_id) < 0)
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goto cleanup;
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}
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if (cpumask && virProcessSetAffinity(iothread->thread_id, cpumask) < 0)
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goto cleanup;
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if (iothread->sched.policy != VIR_PROC_POLICY_NONE &&
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virProcessSetScheduler(iothread->thread_id, iothread->sched.policy,
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iothread->sched.priority) < 0)
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goto cleanup;
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ret = 0;
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cleanup:
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if (cgroup_iothread) {
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if (ret < 0)
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virCgroupRemove(cgroup_iothread);
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virCgroupFree(&cgroup_iothread);
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}
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VIR_FREE(mem_mask);
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return ret;
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iothread->cpumask,
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vm->def->cputune.period,
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vm->def->cputune.quota,
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&iothread->sched);
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}
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