CONFIG_BALLOON_COMPACTION: Allow for balloon memory compaction/migration

General informations

The Linux kernel configuration item CONFIG_BALLOON_COMPACTION has multiple definitions:

Allow for balloon memory compaction/migration found in mm/Kconfig

The configuration item CONFIG_BALLOON_COMPACTION:

• prompt: Allow for balloon memory compaction/migration
• type: bool
• depends on: CONFIG_COMPACTION && CONFIG_MEMORY_BALLOON
• defined in mm/Kconfig
• found in Linux kernels: 6.9-rc+HEAD

Help text

Memory fragmentation introduced by ballooning might reduce significantly the number of 2MB contiguous memory blocks that can be used within a guest, thus imposing performance penalties associated with the reduced number of transparent huge pages that could be used by the guest workload. Allowing the compaction & migration for memory pages enlisted as being part of memory balloon devices avoids the scenario aforementioned and helps improving memory defragmentation.

found in mm/Kconfig

The configuration item CONFIG_BALLOON_COMPACTION:

• prompt:
• type: bool
• depends on: CONFIG_COMPACTION && CONFIG_MEMORY_BALLOON
• defined in mm/Kconfig
• found in Linux kernels: 3.8–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8

Help text

Memory fragmentation introduced by ballooning might reduce significantly the number of 2MB contiguous memory blocks that can be used within a guest, thus imposing performance penalties associated with the reduced number of transparent huge pages that could be used by the guest workload. Allowing the compaction & migration for memory pages enlisted as being part of memory balloon devices avoids the scenario aforementioned and helps improving memory defragmentation.

Hardware

LKDDb

Raw data from LKDDb:

• (none)

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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