Cgroup is used to organize and manage resource available processes. Currently there are no handy tool for gathering reousrce usage information for each and every child cgroups, makes it hard to detect resource outage and debug resource issues. To overcome this, we present the cgroup.top interface. Just like the top command, user is able to easily gather resource usage information , allowing user to detect and respond to resource outage in child cgroups Show case: / # mount -t cgroup2 none /sys/fs/cgroup / # cd /sys/fs/cgroup/ /sys/fs/cgroup # echo "+memory" > cgroup.subtree_control /sys/fs/cgroup # mkdir test1 /sys/fs/cgroup # mkdir test2 /sys/fs/cgroup # mkdir test3 /sys/fs/cgroup # echo $$ > test2/cgroup.procs /sys/fs/cgroup # cd /test /test # ./memcg_malloc 512000 & /test # ./memcg_malloc 512000 & /test # ./memcg_malloc 512000 & /test # cd /sys/fs/cgroup /sys/fs/cgroup # echo $$ > test1/cgroup.procs /sys/fs/cgroup # cd /test /test # ./memcg_malloc 512000 & /test # cd /sys/fs/cgroup /sys/fs/cgroup # echo $$ > test3/cgroup.procs /sys/fs/cgroup # cat cgroup.top memory top: name usage anon file kernel test2 1974272 1671168 0 270336 test1 700416 569344 0 94208 test3 196608 86016 0 86016 Lu Jialin (1): memcg: Adapt cgroup.top into per-memcg Xiu Jianfeng (1): cgroup: Introduce per-cgroup resource top show interface include/linux/cgroup-defs.h | 1 + kernel/cgroup/cgroup.c | 20 +++++++++ mm/memcontrol.c | 87 +++++++++++++++++++++++++++++++++++++ 3 files changed, 108 insertions(+) -- 2.17.1
