[libvirt] [PATCH 31/34] qemu: vcpu: Aggregate code to set vCPU tuning
Peter Krempa
pkrempa at redhat.com
Thu Jan 14 16:27:19 UTC 2016
Rather than iterating 3 times for various settings this function
aggregates all the code into single place. One of the other advantages
is that it can then be reused for properly setting vCPU info on hotplug.
---
src/qemu/qemu_cgroup.c | 98 -----------------------
src/qemu/qemu_cgroup.h | 1 -
src/qemu/qemu_process.c | 205 ++++++++++++++++++++++++++++++++----------------
src/qemu/qemu_process.h | 4 +
4 files changed, 141 insertions(+), 167 deletions(-)
diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c
index 3744b52..827401e 100644
--- a/src/qemu/qemu_cgroup.c
+++ b/src/qemu/qemu_cgroup.c
@@ -1001,104 +1001,6 @@ qemuSetupCgroupCpusetCpus(virCgroupPtr cgroup,
return ret;
}
-int
-qemuSetupCgroupForVcpu(virDomainObjPtr vm)
-{
- virCgroupPtr cgroup_vcpu = NULL;
- qemuDomainObjPrivatePtr priv = vm->privateData;
- virDomainDefPtr def = vm->def;
- size_t i;
- unsigned long long period = vm->def->cputune.period;
- long long quota = vm->def->cputune.quota;
- char *mem_mask = NULL;
- virDomainNumatuneMemMode mem_mode;
-
- if ((period || quota) &&
- !virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU)) {
- virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
- _("cgroup cpu is required for scheduler tuning"));
- return -1;
- }
-
- /*
- * If CPU cgroup controller is not initialized here, then we need
- * neither period nor quota settings. And if CPUSET controller is
- * not initialized either, then there's nothing to do anyway. CPU pinning
- * will be set via virProcessSetAffinity.
- */
- if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU) &&
- !virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET))
- return 0;
-
- /* If vCPU<->pid mapping is missing we can't do vCPU pinning */
- if (!qemuDomainHasVcpuPids(vm))
- return 0;
-
- if (virDomainNumatuneGetMode(vm->def->numa, -1, &mem_mode) == 0 &&
- mem_mode == VIR_DOMAIN_NUMATUNE_MEM_STRICT &&
- virDomainNumatuneMaybeFormatNodeset(vm->def->numa,
- priv->autoNodeset,
- &mem_mask, -1) < 0)
- goto cleanup;
-
- for (i = 0; i < virDomainDefGetVcpusMax(def); i++) {
- virDomainVcpuInfoPtr vcpu = virDomainDefGetVcpu(def, i);
-
- if (!vcpu->online)
- continue;
-
- virCgroupFree(&cgroup_vcpu);
- if (virCgroupNewThread(priv->cgroup, VIR_CGROUP_THREAD_VCPU, i,
- true, &cgroup_vcpu) < 0)
- goto cleanup;
-
- if (period || quota) {
- if (qemuSetupCgroupVcpuBW(cgroup_vcpu, period, quota) < 0)
- goto cleanup;
- }
-
- /* Set vcpupin in cgroup if vcpupin xml is provided */
- if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
- virBitmapPtr cpumap = NULL;
-
- if (mem_mask &&
- virCgroupSetCpusetMems(cgroup_vcpu, mem_mask) < 0)
- goto cleanup;
-
- if (vcpu->cpumask)
- cpumap = vcpu->cpumask;
- else if (vm->def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)
- cpumap = priv->autoCpuset;
- else
- cpumap = vm->def->cpumask;
-
- if (!cpumap)
- continue;
-
- if (qemuSetupCgroupCpusetCpus(cgroup_vcpu, cpumap) < 0)
- goto cleanup;
- }
-
- /* move the thread for vcpu to sub dir */
- if (virCgroupAddTask(cgroup_vcpu,
- qemuDomainGetVcpuPid(vm, i)) < 0)
- goto cleanup;
-
- }
- virCgroupFree(&cgroup_vcpu);
- VIR_FREE(mem_mask);
-
- return 0;
-
- cleanup:
- if (cgroup_vcpu) {
- virCgroupRemove(cgroup_vcpu);
- virCgroupFree(&cgroup_vcpu);
- }
- VIR_FREE(mem_mask);
-
- return -1;
-}
int
qemuSetupCgroupForEmulator(virDomainObjPtr vm)
diff --git a/src/qemu/qemu_cgroup.h b/src/qemu/qemu_cgroup.h
index 2bcf071..fa3353a 100644
--- a/src/qemu/qemu_cgroup.h
+++ b/src/qemu/qemu_cgroup.h
@@ -53,7 +53,6 @@ int qemuSetupCgroupVcpuBW(virCgroupPtr cgroup,
unsigned long long period,
long long quota);
int qemuSetupCgroupCpusetCpus(virCgroupPtr cgroup, virBitmapPtr cpumask);
-int qemuSetupCgroupForVcpu(virDomainObjPtr vm);
int qemuSetupCgroupForIOThreads(virDomainObjPtr vm);
int qemuSetupCgroupForEmulator(virDomainObjPtr vm);
int qemuRemoveCgroup(virQEMUDriverPtr driver, virDomainObjPtr vm);
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index abafbb1..2a783e5 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -2158,56 +2158,6 @@ qemuProcessSetLinkStates(virQEMUDriverPtr driver,
return ret;
}
-/* Set CPU affinities for vcpus if vcpupin xml provided. */
-static int
-qemuProcessSetVcpuAffinities(virDomainObjPtr vm)
-{
- virDomainDefPtr def = vm->def;
- virDomainVcpuInfoPtr vcpu;
- size_t i;
- int ret = -1;
- VIR_DEBUG("Setting affinity on CPUs");
-
- if (!qemuDomainHasVcpuPids(vm)) {
- /* If any CPU has custom affinity that differs from the
- * VM default affinity, we must reject it
- */
- for (i = 0; i < virDomainDefGetVcpusMax(def); i++) {
- vcpu = virDomainDefGetVcpu(def, i);
-
- if (!vcpu->online)
- continue;
-
- if (vcpu->cpumask &&
- !virBitmapEqual(def->cpumask, vcpu->cpumask)) {
- virReportError(VIR_ERR_OPERATION_INVALID,
- "%s", _("cpu affinity is not supported"));
- return -1;
- }
- }
- return 0;
- }
-
- for (i = 0; i < virDomainDefGetVcpusMax(def); i++) {
- virBitmapPtr bitmap;
-
- vcpu = virDomainDefGetVcpu(def, i);
-
- if (!vcpu->online)
- continue;
-
- if (!(bitmap = vcpu->cpumask) &&
- !(bitmap = def->cpumask))
- continue;
-
- if (virProcessSetAffinity(qemuDomainGetVcpuPid(vm, i), bitmap) < 0)
- goto cleanup;
- }
-
- ret = 0;
- cleanup:
- return ret;
-}
/* Set CPU affinities for emulator threads. */
static int
@@ -2256,18 +2206,6 @@ qemuProcessSetSchedulers(virDomainObjPtr vm)
{
size_t i = 0;
- for (i = 0; i < virDomainDefGetVcpusMax(vm->def); i++) {
- virDomainVcpuInfoPtr vcpu = virDomainDefGetVcpu(vm->def, i);
-
- if (!vcpu->online ||
- vcpu->sched.policy == VIR_PROC_POLICY_NONE)
- continue;
-
- if (virProcessSetScheduler(qemuDomainGetVcpuPid(vm, i),
- vcpu->sched.policy, vcpu->sched.priority) < 0)
- return -1;
- }
-
for (i = 0; i < vm->def->niothreadids; i++) {
virDomainIOThreadIDDefPtr info = vm->def->iothreadids[i];
@@ -4425,6 +4363,141 @@ qemuProcessInit(virQEMUDriverPtr driver,
}
+int
+qemuProcessSetupVcpu(virDomainObjPtr vm,
+ unsigned int vcpuid)
+{
+ pid_t vcpupid = qemuDomainGetVcpuPid(vm, vcpuid);
+ virDomainVcpuInfoPtr vcpu = virDomainDefGetVcpu(vm->def, vcpuid);
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ char *mem_mask = NULL;
+ virDomainNumatuneMemMode mem_mode;
+ unsigned long long period = vm->def->cputune.period;
+ long long quota = vm->def->cputune.quota;
+ virCgroupPtr cgroup_vcpu = NULL;
+ virBitmapPtr cpumask;
+ int ret = -1;
+
+ if (period || quota) {
+ if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("cgroup cpu is required for scheduler tuning"));
+ goto cleanup;
+ }
+ }
+
+ if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU) ||
+ virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
+
+ if (virDomainNumatuneGetMode(vm->def->numa, -1, &mem_mode) == 0 &&
+ mem_mode == VIR_DOMAIN_NUMATUNE_MEM_STRICT &&
+ virDomainNumatuneMaybeFormatNodeset(vm->def->numa,
+ priv->autoNodeset,
+ &mem_mask, -1) < 0)
+ goto cleanup;
+
+ if (virCgroupNewThread(priv->cgroup, VIR_CGROUP_THREAD_VCPU, vcpuid,
+ true, &cgroup_vcpu) < 0)
+ goto cleanup;
+
+ if (period || quota) {
+ if (qemuSetupCgroupVcpuBW(cgroup_vcpu, period, quota) < 0)
+ goto cleanup;
+ }
+ }
+
+ /* infer which cpumask shall be used */
+ if (vcpu->cpumask)
+ cpumask = vcpu->cpumask;
+ else if (vm->def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)
+ cpumask = priv->autoCpuset;
+ else
+ cpumask = vm->def->cpumask;
+
+ if (cpumask) {
+ /* setup legacy affinty */
+ if (virProcessSetAffinity(vcpupid, cpumask) < 0)
+ goto cleanup;
+
+ /* setup cgroups */
+ if (cgroup_vcpu &&
+ virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
+ if (mem_mask &&
+ virCgroupSetCpusetMems(cgroup_vcpu, mem_mask) < 0)
+ goto cleanup;
+
+ if (qemuSetupCgroupCpusetCpus(cgroup_vcpu, cpumask) < 0)
+ goto cleanup;
+ }
+ }
+
+ /* move the thread for vcpu to sub dir */
+ if (cgroup_vcpu &&
+ virCgroupAddTask(cgroup_vcpu, vcpupid) < 0)
+ goto cleanup;
+
+ /* set scheduler type and priority */
+ if (vcpu->sched.policy != VIR_PROC_POLICY_NONE) {
+ if (virProcessSetScheduler(vcpupid, vcpu->sched.policy,
+ vcpu->sched.priority) < 0)
+ goto cleanup;
+ }
+
+ ret = 0;
+
+ cleanup:
+ VIR_FREE(mem_mask);
+ if (cgroup_vcpu) {
+ if (ret < 0)
+ virCgroupRemove(cgroup_vcpu);
+ virCgroupFree(&cgroup_vcpu);
+ }
+
+ return ret;
+}
+
+
+static int
+qemuProcessSetupVcpus(virDomainObjPtr vm)
+{
+ virDomainVcpuInfoPtr vcpu;
+ unsigned int maxvcpus = virDomainDefGetVcpusMax(vm->def);
+ size_t i;
+
+ if (!qemuDomainHasVcpuPids(vm)) {
+ /* If any CPU has custom affinity that differs from the
+ * VM default affinity, we must reject it */
+ for (i = 0; i < maxvcpus; i++) {
+ vcpu = virDomainDefGetVcpu(vm->def, i);
+
+ if (!vcpu->online)
+ continue;
+
+ if (vcpu->cpumask &&
+ !virBitmapEqual(vm->def->cpumask, vcpu->cpumask)) {
+ virReportError(VIR_ERR_OPERATION_INVALID,
+ "%s", _("cpu affinity is not supported"));
+ return -1;
+ }
+ }
+
+ return 0;
+ }
+
+ for (i = 0; i < maxvcpus; i++) {
+ vcpu = virDomainDefGetVcpu(vm->def, i);
+
+ if (!vcpu->online)
+ continue;
+
+ if (qemuProcessSetupVcpu(vm, i) < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+
/**
* qemuProcessLaunch:
*
@@ -4896,18 +4969,14 @@ qemuProcessLaunch(virConnectPtr conn,
if (qemuProcessDetectIOThreadPIDs(driver, vm, asyncJob) < 0)
goto cleanup;
- VIR_DEBUG("Setting cgroup for each VCPU (if required)");
- if (qemuSetupCgroupForVcpu(vm) < 0)
+ VIR_DEBUG("Setting vCPU tuning/settings");
+ if (qemuProcessSetupVcpus(vm) < 0)
goto cleanup;
VIR_DEBUG("Setting cgroup for each IOThread (if required)");
if (qemuSetupCgroupForIOThreads(vm) < 0)
goto cleanup;
- VIR_DEBUG("Setting VCPU affinities");
- if (qemuProcessSetVcpuAffinities(vm) < 0)
- goto cleanup;
-
VIR_DEBUG("Setting affinity of IOThread threads");
if (qemuProcessSetIOThreadsAffinity(vm) < 0)
goto cleanup;
diff --git a/src/qemu/qemu_process.h b/src/qemu/qemu_process.h
index c674111..a2663a0 100644
--- a/src/qemu/qemu_process.h
+++ b/src/qemu/qemu_process.h
@@ -155,4 +155,8 @@ virDomainDiskDefPtr qemuProcessFindDomainDiskByAlias(virDomainObjPtr vm,
int qemuConnectAgent(virQEMUDriverPtr driver, virDomainObjPtr vm);
+
+int qemuProcessSetupVcpu(virDomainObjPtr vm,
+ unsigned int vcpuid);
+
#endif /* __QEMU_PROCESS_H__ */
--
2.6.2
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