The patch titled
memcg: update document to mention that swapoff should be tested
has been added to the -mm tree. Its filename is
memcg-update-document-to-mention-swapoff-should-be-test.patch
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------------------------------------------------------
Subject: memcg: update document to mention that swapoff should be tested
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
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: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Acked-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/cgroups/memcg_test.txt | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff -puN Documentation/cgroups/memcg_test.txt~memcg-update-document-to-mention-swapoff-should-be-test Documentation/cgroups/memcg_test.txt
--- a/Documentation/cgroups/memcg_test.txt~memcg-update-document-to-mention-swapoff-should-be-test
+++ a/Documentation/cgroups/memcg_test.txt
@@ -1,6 +1,6 @@
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 CONFI
# 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.
_
Patches currently in -mm which might be from kamezawa.hiroyu@xxxxxxxxxxxxxx are
cgroups-use-hierarchy-mutex-in-creation-failure-path.patch
memcg-get-put-parents-at-create-free.patch
memcg-get-put-parents-at-create-free-fix.patch
memcg-fix-refcnt-handling-at-swapoff.patch
memcg-update-document-to-mention-swapoff-should-be-test.patch
proc-pid-maps-dont-show-pgoff-of-pure-anon-vmas.patch
proc-pid-maps-dont-show-pgoff-of-pure-anon-vmas-checkpatch-fixes.patch
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