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authorDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>2009-01-15 13:51:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-15 16:39:39 -0800
commitc268e9946d7dc30ac4e55cdc3f43c8af1ae8153c (patch)
tree24de026d333ae2d8137165398d71650307cd26c0 /net/Makefile
parent40d58138f832a48208cdce57d6572a033b1f7a23 (diff)
downloadlinux-c268e9946d7dc30ac4e55cdc3f43c8af1ae8153c.tar.bz2
memcg: fix hierarchical reclaim
If root_mem has no children, last_scaned_child is set to root_mem itself. But after some children added to root_mem, mem_cgroup_get_next_node can mem_cgroup_put the root_mem although root_mem has not been mem_cgroup_get. This patch fixes this behavior by: - Set last_scanned_child to NULL if root_mem has no children or DFS search has returned to root_mem itself(root_mem is not a "child" of root_mem). Make mem_cgroup_get_first_node return root_mem in this case. There are no mem_cgroup_get/put for root_mem. - Rename mem_cgroup_get_next_node to __mem_cgroup_get_next_node, and mem_cgroup_get_first_node to mem_cgroup_get_next_node. Make mem_cgroup_hierarchical_reclaim call only new mem_cgroup_get_next_node. Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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