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authorTang Chen <tangchen@cn.fujitsu.com>2013-02-22 16:33:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:14 -0800
commit34b71f1e04fcba578e719e675b4882eeeb2a1f6f (patch)
treebeafbed8dce82b108e95baa2c2424ee0f3e94701 /Documentation
parent4d59a75125d5a4717e57e9fc62c64b3d346e603e (diff)
page_alloc: add movable_memmap kernel parameter
Add functions to parse movablemem_map boot option. Since the option could be specified more then once, all the maps will be stored in the global variable movablemem_map.map array. And also, we keep the array in monotonic increasing order by start_pfn. And merge all overlapped ranges. [akpm@linux-foundation.org: improve comment] [akpm@linux-foundation.org: checkpatch fixes] [akpm@linux-foundation.org: remove unneeded parens] Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Reviewed-by: Wen Congyang <wency@cn.fujitsu.com> Tested-by: Lin Feng <linfeng@cn.fujitsu.com> Cc: Wu Jianguo <wujianguo@huawei.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt17
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9aa8ff3e54dc..722a74161246 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1640,6 +1640,23 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
that the amount of memory usable for all allocations
is not too small.
+ movablemem_map=nn[KMG]@ss[KMG]
+ [KNL,X86,IA-64,PPC] This parameter is similar to
+ memmap except it specifies the memory map of
+ ZONE_MOVABLE.
+ If more areas are all within one node, then from
+ lowest ss to the end of the node will be ZONE_MOVABLE.
+ If an area covers two or more nodes, the area from
+ ss to the end of the 1st node will be ZONE_MOVABLE,
+ and all the rest nodes will only have ZONE_MOVABLE.
+ If memmap is specified at the same time, the
+ movablemem_map will be limited within the memmap
+ areas. If kernelcore or movablecore is also specified,
+ movablemem_map will have higher priority to be
+ satisfied. So the administrator should be careful that
+ the amount of movablemem_map areas are not too large.
+ Otherwise kernel won't have enough memory to start.
+
MTD_Partition= [MTD]
Format: <name>,<region-number>,<size>,<offset>