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authorYasunori Goto <y-goto@jp.fujitsu.com>2008-07-23 21:28:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:21 -0700
commit48c906823f3927b981db9f0b03c2e2499977ee93 (patch)
treef01270b14dbc8e0816e966e1aed1e3294e1c1d4a /mm/page_alloc.c
parentf84f9504bddeec33a72d64ebe95143d3aaeb3f9b (diff)
downloadop-kernel-dev-48c906823f3927b981db9f0b03c2e2499977ee93.zip
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memory hotplug: allocate usemap on the section with pgdat
Usemaps are allocated on the section which has pgdat by this. Because usemap size is very small, many other sections usemaps are allocated on only one page. If a section has usemap, it can't be removed until removing other sections. This dependency is not desirable for memory removing. Pgdat has similar feature. When a section has pgdat area, it must be the last section for removing on the node. So, if section A has pgdat and section B has usemap for section A, Both sections can't be removed due to dependency each other. To solve this issue, this patch collects usemap on same section with pgdat as much as possible. If other sections doesn't have any dependency, this section will be able to be removed finally. Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Andy Whitcroft <apw@shadowen.org> Cc: David Miller <davem@davemloft.net> Cc: Badari Pulavarty <pbadari@us.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Hiroyuki KAMEZAWA <kamezawa.hiroyu@jp.fujitsu.com> Cc: Tony Breeds <tony@bakeyournoodle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
0 files changed, 0 insertions, 0 deletions
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