+++ This bug was initially created as a clone of Bug #1384390 +++

# cgdelete -g memory:eatmem
# cgcreate -g memory:eatmem
# cgset -r memory.memsw.limit_in_bytes=15M eatmem
# echo $?
0
<===== cgset returned 0 here
# cgget -g memory:eatmem | grep -e memory.limit_in_bytes -e memory.memsw.limit_in_bytes
memory.limit_in_bytes: 9223372036854771712
memory.memsw.limit_in_bytes: 9223372036854771712
# cgset -r memory.limit_in_bytes=15M eatmem
# cgget -g memory:eatmem | grep -e memory.limit_in_bytes -e memory.memsw.limit_in_bytes
memory.limit_in_bytes: 15728640
memory.memsw.limit_in_bytes: 9223372036854771712

# cgdelete -g memory:eatmem
# cgcreate -g memory:eatmem
# echo 15728640 > /sys/fs/cgroup/memory/eatmem/memory.memsw.limit_in_bytes
-bash: echo: write error: Invalid argument
<===== Directly use echo return fail
# echo 15728640 > /sys/fs/cgroup/memory/eatmem/memory.limit_in_bytes
# echo 15728640 > /sys/fs/cgroup/memory/eatmem/memory.memsw.limit_in_bytes
# echo $?
0