Memory Cgroup topic in Android

[Zhao Junmin]

Hi All：

We find that google add some code for memory use in android.

from the init.rc, we see that a swap group for background process.

if the process in the swap group, it will swap more aggressive.

    # Create cgroup mount point for memory

    mount tmpfs none /sys/fs/cgroup mode=0750,uid=0,gid=1000

    mkdir /sys/fs/cgroup/memory 0750 root system

    mount cgroup none /sys/fs/cgroup/memory memory

    write /sys/fs/cgroup/memory/memory.move_charge_at_immigrate 1

    chown root system /sys/fs/cgroup/memory/tasks

    chmod 0660 /sys/fs/cgroup/memory/tasks

    mkdir /sys/fs/cgroup/memory/sw 0750 root system

    write /sys/fs/cgroup/memory/sw/memory.swappiness 100

    write /sys/fs/cgroup/memory/sw/memory.move_charge_at_immigrate 1

    chown root system /sys/fs/cgroup/memory/sw/tasks

    chmod 0660 /sys/fs/cgroup/memory/sw/tasks

But in Nexus or Samsung,  the CONFIG_MEMCG feature is disable，but I don't know why google don't use the feature?

Thanks

Zhaojunmin

[Glenn Kasten]

It was not as effective as hoped, so it was disabled.

[Zhao Junmin]

Thanks