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SubjectRe: [PATCH 04/11] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove
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> CONFIG_MIGRATION currently depends on CONFIG_NUMA or on the architecture
> being able to hot-remove memory. The main users of page migration such as
> sys_move_pages(), sys_migrate_pages() and cpuset process migration are
> only beneficial on NUMA so it makes sense.
>
> As memory compaction will operate within a zone and is useful on both NUMA
> and non-NUMA systems, this patch allows CONFIG_MIGRATION to be set if the
> user selects CONFIG_COMPACTION as an option.
>
> Signed-off-by: Mel Gorman <mel@csn.ul.ie>
> Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
> Reviewed-by: Rik van Riel <riel@redhat.com>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> ---
> mm/Kconfig | 20 ++++++++++++++++----
> 1 files changed, 16 insertions(+), 4 deletions(-)
>
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 9c61158..04e241b 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -172,17 +172,29 @@ config SPLIT_PTLOCK_CPUS
> default "4"
>
> #
> +# support for memory compaction
> +config COMPACTION
> + bool "Allow for memory compaction"
> + def_bool y
> + select MIGRATION
> + depends on EXPERIMENTAL && HUGETLBFS && MMU
> + help
> + Allows the compaction of memory for the allocation of huge pages.
> +

If select MIGRATION works, we can remove "depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE"
line from config MIGRATION.


> +#
> # support for page migration
> #
> config MIGRATION
> bool "Page migration"
> def_bool y
> - depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE
> + depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION
> help
> Allows the migration of the physical location of pages of processes
> - while the virtual addresses are not changed. This is useful for
> - example on NUMA systems to put pages nearer to the processors accessing
> - the page.
> + while the virtual addresses are not changed. This is useful in
> + two situations. The first is on NUMA systems to put pages nearer
> + to the processors accessing. The second is when allocating huge
> + pages as migration can relocate pages to satisfy a huge page
> + allocation instead of reclaiming.
>
> config PHYS_ADDR_T_64BIT
> def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
> --
> 1.6.5
>





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