The patch titled mm: allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove has been added to the -mm tree. Its filename is mm-allow-config_migration-to-be-set-without-config_numa-or-memory-hot-remove.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: mm: allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove From: Mel Gorman <mel@xxxxxxxxx> 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@xxxxxxxxx> Reviewed-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx> Reviewed-by: Rik van Riel <riel@xxxxxxxxxx> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: Minchan Kim <minchan.kim@xxxxxxxxx> Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/Kconfig | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff -puN mm/Kconfig~mm-allow-config_migration-to-be-set-without-config_numa-or-memory-hot-remove mm/Kconfig --- a/mm/Kconfig~mm-allow-config_migration-to-be-set-without-config_numa-or-memory-hot-remove +++ a/mm/Kconfig @@ -172,6 +172,16 @@ 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. + +# # support for page migration # config MIGRATION @@ -180,9 +190,11 @@ config MIGRATION depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE 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 _ Patches currently in -mm which might be from mel@xxxxxxxxx are page-allocator-reduce-fragmentation-in-buddy-allocator-by-adding-buddies-that-are-merging-to-the-tail-of-the-free-lists.patch mempolicy-remove-redundant-code.patch mm-default-to-node-zonelist-ordering-when-nodes-have-only-lowmem.patch mm-migration-take-a-reference-to-the-anon_vma-before-migrating.patch mm-migration-do-not-try-to-migrate-unmapped-anonymous-pages.patch mm-share-the-anon_vma-ref-counts-between-ksm-and-page-migration.patch mm-allow-config_migration-to-be-set-without-config_numa-or-memory-hot-remove.patch mm-export-unusable-free-space-index-via-proc-unusable_index.patch mm-export-fragmentation-index-via-proc-extfrag_index.patch mm-move-definition-for-lru-isolation-modes-to-a-header.patch mm-compaction-memory-compaction-core.patch mm-compaction-add-proc-trigger-for-memory-compaction.patch mm-compaction-add-sys-trigger-for-per-node-memory-compaction.patch mm-compaction-direct-compact-when-a-high-order-allocation-fails.patch mm-compaction-add-a-tunable-that-decides-when-memory-should-be-compacted-and-when-it-should-be-reclaimed.patch mm-compaction-do-not-compact-within-a-preferred-zone-after-a-compaction-failure.patch mm-migration-allow-the-migration-of-pageswapcache-pages.patch delay-accounting-re-implement-c-for-getdelaysc-to-report-information-on-a-target-command.patch delay-accounting-re-implement-c-for-getdelaysc-to-report-information-on-a-target-command-checkpatch-fixes.patch add-debugging-aid-for-memory-initialisation-problems.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html