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I found we can no longer set limit to 0 with 2.6.27-rcX: # mount -t cgroup -omemory xxx /mnt # mkdir /mnt/0 # echo 0 > /mnt/0/memory.limit_in_bytes bash: echo: write error: Device or resource busy It turned out 'limit' can't be set to 'usage', which is wrong IMO. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>