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pkg/kubelet/cm/cgroup_manager: simplify setting hugetlb

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Commit 79be8be10e made hugetlb settings optional if cgroup v2 is used and
hugetlb is not available, fixing issue 92933. Note at that time this was only
needed for v2, because for v1 the resources were set one-by-one, and only for
supported resources.

Commit d312ef7eb6 switched the code to using Set from runc/libcontainer
cgroups manager, and expanded the check to cgroup v1 as well.

Move this check earlier, to inside m.toResources, so instead of
converting all hugetlb resources from ResourceConfig to libcontainers's
Resources.HugetlbLimit, and then setting it to nil, we can skip the
conversion entirely if hugetlb is not supported, thus not doing the work
that is not needed.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This commit is contained in:
Kir Kolyshkin 2021-12-20 14:48:40 -08:00
parent 59148e22d0
commit 11b0d57c93
1 changed files with 28 additions and 23 deletions
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51
pkg/kubelet/cm/cgroup_manager_linux.go
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@ -404,8 +404,34 @@ func (m *cgroupManagerImpl) toResources(resourceConfig *ResourceConfig) *libcont
if resourceConfig.PidsLimit != nil {
resources.PidsLimit = *resourceConfig.PidsLimit
}
// if huge pages are enabled, we set them in libcontainer
// for each page size enumerated, set that value
m.maybeSetHugetlb(resourceConfig, resources)
// Ideally unified is used for all the resources when running on cgroup v2.
// It doesn't make difference for the memory.max limit, but for e.g. the cpu controller
// you can specify the correct setting without relying on the conversions performed by the OCI runtime.
if resourceConfig.Unified != nil && libcontainercgroups.IsCgroup2UnifiedMode() {
resources.Unified = make(map[string]string)
for k, v := range resourceConfig.Unified {
resources.Unified[k] = v
}
}
return resources
}
func (m *cgroupManagerImpl) maybeSetHugetlb(resourceConfig *ResourceConfig, resources *libcontainerconfigs.Resources) {
// Check if hugetlb is supported.
if libcontainercgroups.IsCgroup2UnifiedMode() {
if !getSupportedUnifiedControllers().Has("hugetlb") {
klog.V(6).InfoS("Optional subsystem not supported: hugetlb")
return
}
} else if _, ok := m.subsystems.MountPoints["hugetlb"]; !ok {
klog.V(6).InfoS("Optional subsystem not supported: hugetlb")
return
}
// For each page size enumerated, set that value.
pageSizes := sets.NewString()
for pageSize, limit := range resourceConfig.HugePageLimit {
sizeString, err := v1helper.HugePageUnitSizeFromByteSize(pageSize)
@ -429,16 +455,6 @@ func (m *cgroupManagerImpl) toResources(resourceConfig *ResourceConfig) *libcont
Limit: uint64(0),
})
}
// Ideally unified is used for all the resources when running on cgroup v2.
// It doesn't make difference for the memory.max limit, but for e.g. the cpu controller
// you can specify the correct setting without relying on the conversions performed by the OCI runtime.
if resourceConfig.Unified != nil && libcontainercgroups.IsCgroup2UnifiedMode() {
resources.Unified = make(map[string]string)
for k, v := range resourceConfig.Unified {
resources.Unified[k] = v
}
}
return resources
}
// Update updates the cgroup with the specified Cgroup Configuration
@ -469,17 +485,6 @@ func (m *cgroupManagerImpl) Update(cgroupConfig *CgroupConfig) error {
updateSystemdCgroupInfo(libcontainerCgroupConfig, cgroupConfig.Name)
}
if unified {
supportedControllers := getSupportedUnifiedControllers()
if !supportedControllers.Has("hugetlb") {
resources.HugetlbLimit = nil
klog.V(6).InfoS("Optional subsystem not supported: hugetlb")
}
} else if _, ok := m.subsystems.MountPoints["hugetlb"]; !ok {
resources.HugetlbLimit = nil
klog.V(6).InfoS("Optional subsystem not supported: hugetlb")
}
manager, err := m.adapter.newManager(libcontainerCgroupConfig, paths)
if err != nil {
return fmt.Errorf("failed to create cgroup manager: %v", err)