CONFIG_CMM: Collaborative memory management

General informations

The Linux kernel configuration item CONFIG_CMM has multiple definitions:

Collaborative memory management found in arch/powerpc/platforms/pseries/Kconfig

The configuration item CONFIG_CMM:

• prompt: Collaborative memory management
• type: tristate
• depends on: CONFIG_PPC_SMLPAR
• defined in arch/powerpc/platforms/pseries/Kconfig
• found in Linux kernels: 2.6.27–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.11, 6.12-rc+HEAD
• modules built: cmm, cmm

Help text

Select this option, if you want to enable the kernel interface to reduce the memory size of the system. This is accomplished by allocating pages of memory and put them "on hold". This only makes sense for a system running in an LPAR where the unused pages will be reused for other LPARs. The interface allows firmware to balance memory across many LPARs.

Cooperative memory management found in arch/s390/Kconfig

The configuration item CONFIG_CMM:

• prompt: Cooperative memory management
• type: tristate
• depends on: (none)
• defined in arch/s390/Kconfig
• found in Linux kernels: 2.6.4–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.11, 6.12-rc+HEAD
• modules built: cmm, cmm

Help text

Select this option, if you want to enable the kernel interface to reduce the memory size of the system. This is accomplished by allocating pages of memory and put them "on hold". This only makes sense for a system running under VM where the unused pages will be reused by VM for other guest systems. The interface allows an external monitor to balance memory of many systems. Everybody who wants to run Linux under VM should select this option.

Hardware

LKDDb

Raw data from LKDDb:

• lkddb fs "ppc-cmm" : CONFIG_CMM CONFIG_PPC_PSERIES : arch/powerpc/platforms/pseries/cmm.c # in 5.5–5.19, 5.19+HEAD
• lkddb module cmm CONFIG_CMM : arch/powerpc/platforms/pseries/Kconfig : "Collaborative memory management" # in 2.6.27–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.11, 6.12-rc+HEAD
• lkddb module cmm CONFIG_CMM : arch/s390/Kconfig : "Cooperative memory management" # in 2.6.4–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.11, 6.12-rc+HEAD

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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