memcg: update memcg_test.txt to describe memory thresholds

1e111452 · Kirill A. Shutemov <[email protected]> · 2010-03-10 15:22:36 -08:00

Decription of sanity check for memory thresholds.

Signed-off-by: Kirill A.  Shutemov <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Paul Menage <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Cc: Dan Malek <[email protected]>
Cc: Daisuke Nishimura <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 1e111452d457ceedec8a57fc3d45b1312e736fba
Parents: 1d8fd973

Changes

1 files changed · +21 −0

File	Status	Add	Del	Content
Documentation/cgroups/memcg_test.txt	modified	+21	−0	View file

Documentation/cgroups/memcg_test.txt

View file

diff --git a/Documentation/cgroups/memcg_test.txt b/Documentation/cgroups/memcg_test.txt
index e011488..4d32e0e 100644
--- a/Documentation/cgroups/memcg_test.txt
+++ b/Documentation/cgroups/memcg_test.txt
@@ -396,3 +396,24 @@ Under below explanation, we assume CONFIG_MEM_RES_CTRL_SWAP=y.
 	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.
+
+ 9.10 Memory thresholds
+	Memory controler implements memory thresholds using cgroups notification
+	API. You can use Documentation/cgroups/cgroup_event_listener.c to test
+	it.
+
+	(Shell-A) Create cgroup and run event listener
+	# mkdir /cgroup/A
+	# ./cgroup_event_listener /cgroup/A/memory.usage_in_bytes 5M
+
+	(Shell-B) Add task to cgroup and try to allocate and free memory
+	# echo $$ >/cgroup/A/tasks
+	# a="$(dd if=/dev/zero bs=1M count=10)"
+	# a=
+
+	You will see message from cgroup_event_listener every time you cross
+	the thresholds.
+
+	Use /cgroup/A/memory.memsw.usage_in_bytes to test memsw thresholds.
+
+	It's good idea to test root cgroup as well.