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qemu, ch: Move threads to cgroup dir before changing parameters

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With cgroupv2 this has better effect on the resource allocation.  An
excerpt from Documentation/admin-guide/cgroup-v2.rst explains is this
way:

  Migrating a process across cgroups is a relatively expensive operation
  and stateful resources such as memory are not moved together with the
  process.  This is an explicit design decision as there often exist
  inherent trade-offs between migration and various hot paths in terms
  of synchronization cost.

  [...]

  Setting a non-empty value to "cpuset.mems" causes memory of
  tasks within the cgroup to be migrated to the designated nodes if
  they are currently using memory outside of the designated nodes.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Martin Kletzander 2023-04-14 12:08:59 +02:00
parent d2af152d1f
commit 383caddea1
2 changed files with 11 additions and 11 deletions
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12
src/ch/ch_process.c
View File

@ -262,6 +262,12 @@ virCHProcessSetupPid(virDomainObj *vm,
if (virCgroupNewThread(priv->cgroup, nameval, id, true, &cgroup) < 0)
goto cleanup;
/* Move the thread to the sub dir before changing the settings so that
* all take effect even with cgroupv2. */
VIR_INFO("Adding pid %d to cgroup", pid);
if (virCgroupAddThread(cgroup, pid) < 0)
goto cleanup;
if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
if (use_cpumask &&
virDomainCgroupSetupCpusetCpus(cgroup, use_cpumask) < 0)
@ -274,12 +280,6 @@ virCHProcessSetupPid(virDomainObj *vm,
if (virDomainCgroupSetupVcpuBW(cgroup, period, quota) < 0)
goto cleanup;
/* Move the thread to the sub dir */
VIR_INFO("Adding pid %d to cgroup", pid);
if (virCgroupAddThread(cgroup, pid) < 0)
goto cleanup;
}
if (!affinity_cpumask)

10
src/qemu/qemu_process.c
View File

@ -2630,6 +2630,11 @@ qemuProcessSetupPid(virDomainObj *vm,
if (virCgroupNewThread(priv->cgroup, nameval, id, true, &cgroup) < 0)
goto cleanup;
/* Move the thread to the sub dir before changing the settings so that
* all take effect even with cgroupv2. */
if (virCgroupAddThread(cgroup, pid) < 0)
goto cleanup;
if (virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUSET)) {
if (use_cpumask &&
virDomainCgroupSetupCpusetCpus(cgroup, use_cpumask) < 0)
@ -2642,11 +2647,6 @@ qemuProcessSetupPid(virDomainObj *vm,
if (virDomainCgroupSetupVcpuBW(cgroup, period, quota) < 0)
goto cleanup;
/* Move the thread to the sub dir */
if (virCgroupAddThread(cgroup, pid) < 0)
goto cleanup;
}
if (!affinity_cpumask)