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CONFIG_DEFERRED_STRUCT_PAGE_INIT: Defer initialisation of struct pages to kthreads

General informations

The Linux kernel configuration item CONFIG_DEFERRED_STRUCT_PAGE_INIT has multiple definitions:

Defer initialisation of struct pages to kswapd found in mm/Kconfig

The configuration item CONFIG_DEFERRED_STRUCT_PAGE_INIT:

Help text

Ordinarily all struct pages are initialised during early boot in a single thread. On very large machines this can take a considerable amount of time. If this option is set, large machines will bring up a subset of memmap at boot and then initialise the rest in parallel when kswapd starts. This has a potential performance impact on processes running early in the lifetime of the systemm until kswapd finishes the initialisation.

Defer initialisation of struct pages to kthreads found in mm/Kconfig

The configuration item CONFIG_DEFERRED_STRUCT_PAGE_INIT:

Help text

Ordinarily all struct pages are initialised during early boot in a single thread. On very large machines this can take a considerable amount of time. If this option is set, large machines will bring up a subset of memmap at boot and then initialise the rest in parallel by starting one-off "pgdatinitX" kernel thread for each node X. This has a potential performance impact on processes running early in the lifetime of the system until these kthreads finish the initialisation.

Hardware

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