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| author |   Lai Jiangshan <laijs@cn.fujitsu.com> | 2012-12-12 13:52:00 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-12 17:38:34 -0800 |
| commit | 20b2f52b73febce476fc9376f0296c1aa0e4f5a7 (patch) | |
| tree | 037d74ec3666d3dfc7c235c7b59b11ed9b29d3b4 /mm | |
| parent | mm, memcg: avoid unnecessary function call when memcg is disabled (diff) | |
| download | linux-dev-20b2f52b73febce476fc9376f0296c1aa0e4f5a7.tar.xz linux-dev-20b2f52b73febce476fc9376f0296c1aa0e4f5a7.zip | |
numa: add CONFIG_MOVABLE_NODE for movable-dedicated node
We need a node which only contains movable memory. This feature is very
important for node hotplug. If a node has normal/highmem, the memory may
be used by the kernel and can't be offlined. If the node only contains
movable memory, we can offline the memory and the node.
All are prepared, we can actually introduce N_MEMORY.
add CONFIG_MOVABLE_NODE make we can use it for movable-dedicated node
[akpm@linux-foundation.org: fix Kconfig text]
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Tested-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Kconfig | 8 | ||||
| -rw-r--r-- | mm/page_alloc.c | 3 |
2 files changed, 11 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index e6651c5de14f..1680a0123a13 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -143,6 +143,14 @@ config NO_BOOTMEM config MEMORY_ISOLATION boolean +config MOVABLE_NODE + boolean "Enable to assign a node which has only movable memory" + depends on HAVE_MEMBLOCK + depends on NO_BOOTMEM + depends on X86_64 + depends on NUMA + default y + # eventually, we can have this option just 'select SPARSEMEM' config MEMORY_HOTPLUG bool "Allow for memory hot-add" diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 35727168896b..2bf0d43d646b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -90,6 +90,9 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = { #ifdef CONFIG_HIGHMEM [N_HIGH_MEMORY] = { { [0] = 1UL } }, #endif +#ifdef CONFIG_MOVABLE_NODE + [N_MEMORY] = { { [0] = 1UL } }, +#endif [N_CPU] = { { [0] = 1UL } }, #endif /* NUMA */ }; |