CONFIG_CGROUP_HUGETLB: HugeTLB controller

General informations

The Linux kernel configuration item CONFIG_CGROUP_HUGETLB has multiple definitions:

HugeTLB controller found in init/Kconfig

The configuration item CONFIG_CGROUP_HUGETLB:

• prompt: HugeTLB controller
• type: bool
• depends on: CONFIG_HUGETLB_PAGE
• defined in init/Kconfig
• found in Linux kernels: 4.5–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Provides a cgroup controller for HugeTLB pages. When you enable this, you can put a per cgroup limit on HugeTLB usage. The limit is enforced during page fault. Since HugeTLB doesn't support page reclaim, enforcing the limit at page fault time implies that, the application will get SIGBUS signal if it tries to access HugeTLB pages beyond its limit. This requires the application to know beforehand how much HugeTLB pages it would require for its use. The control group is tracked in the third page lru pointer. This means that we cannot use the controller with huge page less than 3 pages.

HugeTLB Resource Controller for Control Groups found in init/Kconfig

The configuration item CONFIG_CGROUP_HUGETLB:

• prompt: HugeTLB Resource Controller for Control Groups
• type: bool
• depends on: CONFIG_HUGETLB_PAGE
• defined in init/Kconfig
• found in Linux kernels: 3.6–3.19, 4.0–4.4

Help text

Provides a cgroup Resource Controller for HugeTLB pages. When you enable this, you can put a per cgroup limit on HugeTLB usage. The limit is enforced during page fault. Since HugeTLB doesn't support page reclaim, enforcing the limit at page fault time implies that, the application will get SIGBUS signal if it tries to access HugeTLB pages beyond its limit. This requires the application to know beforehand how much HugeTLB pages it would require for its use. The control group is tracked in the third page lru pointer. This means that we cannot use the controller with huge page less than 3 pages.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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