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author | Greg Thelen <gthelen@google.com> | 2010-06-04 14:15:03 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-06-04 15:21:45 -0700 |
commit | 94b3dd0f7bb393d93e84a173b1df9b8b64c83ac4 (patch) | |
tree | 11f49a1614e8321a6b4335f7a5022a487838397d /net/llc | |
parent | 007d08678eb87478b65b3f229960c81dd7c7b8f3 (diff) | |
download | op-kernel-dev-94b3dd0f7bb393d93e84a173b1df9b8b64c83ac4.zip op-kernel-dev-94b3dd0f7bb393d93e84a173b1df9b8b64c83ac4.tar.gz |
cgroups: alloc_css_id() increments hierarchy depth
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>
Cc: <stable@kernel.org> [2.6.34.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/llc')
0 files changed, 0 insertions, 0 deletions