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Commit 8d50d369 authored by KAMEZAWA Hiroyuki's avatar KAMEZAWA Hiroyuki Committed by Linus Torvalds
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memcg: update document to mention that swapoff should be tested 



Considering the recently found problem "memcg: fix refcnt handling at
swapoff", it's better to mention swapoff behavior in the memcg_test
document.

Signed-off-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: default avatarBalbir Singh <balbir@linux.vnet.ibm.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 85d9fc89

Documentation/cgroups/memcg_test.txt

+22 −2
Original line number Diff line number Diff line 
Memory Resource Controller(Memcg)  Implementation Memo.

Last Updated: 2008/12/15

Base Kernel Version: based on 2.6.28-rc8-mm.

Last Updated: 2009/1/19

Base Kernel Version: based on 2.6.29-rc2.



Because VM is getting complex (one of reasons is memcg...), memcg's behavior

is complex. This is a document for memcg's internal behavior.
@@ -340,3 +340,23 @@ Under below explanation, we assume CONFIG_MEM_RES_CTRL_SWAP=y. 
	# mount -t cgroup none /cgroup -t cpuset,memory,cpu,devices



	and do task move, mkdir, rmdir etc...under this.



 9.7 swapoff.

	Besides management of swap is one of complicated parts of memcg,

	call path of swap-in at swapoff is not same as usual swap-in path..

	It's worth to be tested explicitly.



	For example, test like following is good.

	(Shell-A)

	# mount -t cgroup none /cgroup -t memory

	# mkdir /cgroup/test

	# echo 40M > /cgroup/test/memory.limit_in_bytes

	# echo 0 > /cgroup/test/tasks

	Run malloc(100M) program under this. You'll see 60M of swaps.

	(Shell-B)

	# move all tasks in /cgroup/test to /cgroup

	# /sbin/swapoff -a

	# rmdir /test/cgroup

	# kill malloc task.



	Of course, tmpfs v.s. swapoff test should be tested, too.