CONFIG_CGROUP_MEM_RES_CTLR_SWAP: Memory Resource Controller Swap Extension

General informations

The Linux kernel configuration item CONFIG_CGROUP_MEM_RES_CTLR_SWAP has multiple definitions:

Memory Resource Controller Swap Extension found in init/Kconfig

The configuration item CONFIG_CGROUP_MEM_RES_CTLR_SWAP:

• prompt: Memory Resource Controller Swap Extension
• type: bool
• depends on: CONFIG_CGROUP_MEM_RES_CTLR && CONFIG_SWAP
• defined in init/Kconfig
• found in Linux kernels: 2.6.36–2.6.39, 3.0–3.5

Help text

Add swap management feature to memory resource controller. When you enable this, you can limit mem+swap usage per cgroup. In other words, when you disable this, memory resource controller has no cares to usage of swap...a process can exhaust all of the swap. This extension is useful when you want to avoid exhaustion swap but this itself adds more overheads and consumes memory for remembering information. Especially if you use 32bit system or small memory system, please be careful about enabling this. When memory resource controller is disabled by boot option, this will be automatically disabled and there will be no overhead from this. Even when you set this config=y, if boot option "swapaccount=0" is set, swap will not be accounted. Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page size is 4096bytes, 512k per 1Gbytes of swap.

Memory Resource Controller Swap Extension(EXPERIMENTAL) found in init/Kconfig

The configuration item CONFIG_CGROUP_MEM_RES_CTLR_SWAP:

• prompt: Memory Resource Controller Swap Extension(EXPERIMENTAL)
• type: bool
• depends on: CONFIG_CGROUP_MEM_RES_CTLR && CONFIG_SWAP && CONFIG_EXPERIMENTAL
• defined in init/Kconfig
• found in Linux kernels: 2.6.29–2.6.35

Help text

Add swap management feature to memory resource controller. When you enable this, you can limit mem+swap usage per cgroup. In other words, when you disable this, memory resource controller has no cares to usage of swap...a process can exhaust all of the swap. This extension is useful when you want to avoid exhaustion swap but this itself adds more overheads and consumes memory for remembering information. Especially if you use 32bit system or small memory system, please be careful about enabling this. When memory resource controller is disabled by boot option, this will be automatically disabled and there will be no overhead from this. Even when you set this config=y, if boot option "noswapaccount" is set, swap will not be accounted. Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page size is 4096bytes, 512k per 1Gbytes of swap.

Hardware

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Sources

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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