diff options
| author | Greg Thelen <gthelen@google.com> | 2010-06-04 14:15:03 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-07-05 11:22:46 -0700 |
| commit | 181e8191c6f3ba70136fe83af6dfa5b90789cd42 (patch) | |
| tree | d7c03c205e4bd84002d6b970ab1bce164ef43e1c /kernel | |
| parent | 2f055d42e40b10d8f55439f9b6bd7defcb9d7873 (diff) | |
cgroups: alloc_css_id() increments hierarchy depth
commit 94b3dd0f7bb393d93e84a173b1df9b8b64c83ac4 upstream.
Child groups should have a greater depth than their parents. Prior to
this change, the parent would incorrectly report zero memory usage for
child cgroups when use_hierarchy is enabled.
test script:
mount -t cgroup none /cgroups -o memory
cd /cgroups
mkdir cg1
echo 1 > cg1/memory.use_hierarchy
mkdir cg1/cg11
echo $$ > cg1/cg11/tasks
dd if=/dev/zero of=/tmp/foo bs=1M count=1
echo
echo CHILD
grep cache cg1/cg11/memory.stat
echo
echo PARENT
grep cache cg1/memory.stat
echo $$ > tasks
rmdir cg1/cg11 cg1
cd /
umount /cgroups
Using fae9c79, a recent patch that changed alloc_css_id() depth computation,
the parent incorrectly reports zero usage:
root@ubuntu:~# ./test
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.0151844 s, 69.1 MB/s
CHILD
cache 1048576
total_cache 1048576
PARENT
cache 0
total_cache 0
With this patch, the parent correctly includes child usage:
root@ubuntu:~# ./test
1+0 records in
1+0 records out
1048576 bytes (1.0 MB) copied, 0.0136827 s, 76.6 MB/s
CHILD
cache 1052672
total_cache 1052672
PARENT
cache 0
total_cache 1052672
Signed-off-by: Greg Thelen <gthelen@google.com>
Acked-by: Paul Menage <menage@google.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 6d870f2d1228..bf4f78f026e8 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -4599,7 +4599,7 @@ static int alloc_css_id(struct cgroup_subsys *ss, struct cgroup *parent, parent_css = parent->subsys[subsys_id]; child_css = child->subsys[subsys_id]; parent_id = parent_css->id; - depth = parent_id->depth; + depth = parent_id->depth + 1; child_id = get_new_cssid(ss, depth); if (IS_ERR(child_id)) |