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memcg: update memcg_test.txt

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Update memcg_test.txt to describe how to test the move-charge feature.

Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daisuke Nishimura 2010-03-10 15:22:31 -08:00 committed by Linus Torvalds
parent d2265e6fa3
commit 1080d7a303
1 changed files with 20 additions and 2 deletions
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Documentation/cgroups/memcg_test.txt
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@ -1,6 +1,6 @@
Memory Resource Controller(Memcg) Implementation Memo. Memory Resource Controller(Memcg) Implementation Memo.
Last Updated: 2009/1/20 Last Updated: 2010/2
Base Kernel Version: based on 2.6.29-rc2. Base Kernel Version: based on 2.6.33-rc7-mm(candidate for 34).
Because VM is getting complex (one of reasons is memcg...), memcg's behavior Because VM is getting complex (one of reasons is memcg...), memcg's behavior
is complex. This is a document for memcg's internal behavior. is complex. This is a document for memcg's internal behavior.
@ -378,3 +378,21 @@ Under below explanation, we assume CONFIG_MEM_RES_CTRL_SWAP=y.
#echo 50M > memory.limit_in_bytes #echo 50M > memory.limit_in_bytes
#echo 50M > memory.memsw.limit_in_bytes #echo 50M > memory.memsw.limit_in_bytes
run 51M of malloc run 51M of malloc
9.9 Move charges at task migration
Charges associated with a task can be moved along with task migration.
(Shell-A)
#mkdir /cgroup/A
#echo $$ >/cgroup/A/tasks
run some programs which uses some amount of memory in /cgroup/A.
(Shell-B)
#mkdir /cgroup/B
#echo 1 >/cgroup/B/memory.move_charge_at_immigrate
#echo "pid of the program running in group A" >/cgroup/B/tasks
You can see charges have been moved by reading *.usage_in_bytes or
memory.stat of both A and B.
See 8.2 of Documentation/cgroups/memory.txt to see what value should be
written to move_charge_at_immigrate.