[libvirt] [PATCH v2 1/5] qemu: Add qemuProcessSetupPid() and use it in qemuProcessSetupIOThread()
Martin Kletzander
mkletzan at redhat.com
Thu Jul 7 12:12:28 UTC 2016
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 at redhat.com>
---
src/qemu/qemu_process.c | 200 +++++++++++++++++++++++++++---------------------
1 file changed, 114 insertions(+), 86 deletions(-)
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 129c070d40d0..6fd6ee3d2d9a 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -2304,6 +2304,114 @@ qemuProcessSetLinkStates(virQEMUDriverPtr driver,
}
+/**
+ * qemuProcessSetupPid:
+ *
+ * This function sets resource properities (affinity, cgroups,
+ * scheduler) for any PID associated with a domain. It should be used
+ * to set up emulator PIDs as well as vCPU and I/O thread pids to
+ * ensure they are all handled the same way.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+static int
+qemuProcessSetupPid(virDomainObjPtr vm,
+ pid_t pid,
+ virCgroupThreadName nameval,
+ int id,
+ virBitmapPtr cpumask,
+ unsigned long long period,
+ long long quota,
+ virDomainThreadSchedParamPtr sched)
+{
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ virDomainNumatuneMemMode mem_mode;
+ virCgroupPtr cgroup = NULL;
+ virBitmapPtr use_cpumask;
+ char *mem_mask = NULL;
+ int ret = -1;
+
+ if ((period || quota) &&
+ !virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("cgroup cpu is required for scheduler tuning"));
+ goto cleanup;
+ }
+
+ /* Infer which cpumask shall be used. */
+ if (cpumask)
+ use_cpumask = cpumask;
+ else if (vm->def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)
+ use_cpumask = priv->autoCpuset;
+ else
+ use_cpumask = vm->def->cpumask;
+
+ /*
+ * 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.
+ */
+ 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, nameval, id, true, &cgroup) < 0)
+ goto cleanup;
+
+ if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
+ if (use_cpumask &&
+ qemuSetupCgroupCpusetCpus(cgroup, use_cpumask) < 0)
+ goto cleanup;
+
+ /*
+ * Don't setup cpuset.mems for the emulator, they need to
+ * be set up after initialization in order for kvm
+ * allocations to succeed.
+ */
+ if (nameval != VIR_CGROUP_THREAD_EMULATOR &&
+ mem_mask && virCgroupSetCpusetMems(cgroup, mem_mask) < 0)
+ goto cleanup;
+
+ }
+
+ if ((period || quota) &&
+ qemuSetupCgroupVcpuBW(cgroup, period, quota) < 0)
+ goto cleanup;
+
+ /* Move the thread to the sub dir */
+ if (virCgroupAddTask(cgroup, pid) < 0)
+ goto cleanup;
+
+ }
+
+ /* Setup legacy affinity. */
+ if (use_cpumask && virProcessSetAffinity(pid, use_cpumask) < 0)
+ goto cleanup;
+
+ /* Set scheduler type and priority. */
+ if (sched &&
+ virProcessSetScheduler(pid, sched->policy, sched->priority) < 0)
+ goto cleanup;
+
+ ret = 0;
+ cleanup:
+ VIR_FREE(mem_mask);
+ if (cgroup) {
+ if (ret < 0)
+ virCgroupRemove(cgroup);
+ virCgroupFree(&cgroup);
+ }
+
+ return ret;
+}
+
+
static int
qemuProcessSetupEmulator(virDomainObjPtr vm)
{
@@ -4704,98 +4812,18 @@ qemuProcessSetupVcpus(virDomainObjPtr vm)
}
-/**
- * qemuProcessSetupIOThread:
- * @vm: domain object
- * @iothread: iothread data structure to set the data for
- *
- * This function sets resource properities (affinity, cgroups, scheduler) for a
- * IOThread. This function expects that the IOThread is online and the IOThread
- * pids were correctly detected at the point when it's called.
- *
- * Returns 0 on success, -1 on error.
- */
int
qemuProcessSetupIOThread(virDomainObjPtr vm,
virDomainIOThreadIDDefPtr iothread)
{
- qemuDomainObjPrivatePtr priv = vm->privateData;
- unsigned long long period = vm->def->cputune.period;
- long long quota = vm->def->cputune.quota;
- virDomainNumatuneMemMode mem_mode;
- char *mem_mask = NULL;
- virCgroupPtr cgroup_iothread = NULL;
- virBitmapPtr cpumask = NULL;
- int ret = -1;
-
- 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 (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_IOTHREAD,
+ return qemuProcessSetupPid(vm, iothread->thread_id,
+ VIR_CGROUP_THREAD_IOTHREAD,
iothread->iothread_id,
- true, &cgroup_iothread) < 0)
- goto cleanup;
- }
-
- if (iothread->cpumask)
- cpumask = iothread->cpumask;
- else if (vm->def->placement_mode == VIR_DOMAIN_CPU_PLACEMENT_MODE_AUTO)
- cpumask = priv->autoCpuset;
- else
- cpumask = vm->def->cpumask;
-
- if (period || quota) {
- if (qemuSetupCgroupVcpuBW(cgroup_iothread, period, quota) < 0)
- goto cleanup;
- }
-
- if (cgroup_iothread) {
- if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
- if (mem_mask &&
- virCgroupSetCpusetMems(cgroup_iothread, mem_mask) < 0)
- goto cleanup;
-
- if (cpumask &&
- qemuSetupCgroupCpusetCpus(cgroup_iothread, cpumask) < 0)
- goto cleanup;
- }
-
- if (virCgroupAddTask(cgroup_iothread, iothread->thread_id) < 0)
- goto cleanup;
- }
-
- if (cpumask && virProcessSetAffinity(iothread->thread_id, cpumask) < 0)
- goto cleanup;
-
- if (iothread->sched.policy != VIR_PROC_POLICY_NONE &&
- virProcessSetScheduler(iothread->thread_id, iothread->sched.policy,
- iothread->sched.priority) < 0)
- goto cleanup;
-
- ret = 0;
-
- cleanup:
- if (cgroup_iothread) {
- if (ret < 0)
- virCgroupRemove(cgroup_iothread);
- virCgroupFree(&cgroup_iothread);
- }
-
- VIR_FREE(mem_mask);
- return ret;
+ iothread->cpumask,
+ vm->def->cputune.period,
+ vm->def->cputune.quota,
+ &iothread->sched);
}
--
2.9.0
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