[RFC][PATCH] another swap controller for cgroup

[Daisuke Nishimura]

YAMAMOTO Takashi wrote:
> hi,
> 
> i tried to reproduce the large swap cache issue, but no luck.
> can you provide a little more detailed instruction?
> 
This issue also happens on generic 2.6.25-rc3-mm1
(with limitting only memory), so I think this issue is not
related to your patch.
I'm investigating this issue too.

Below is my environment and how to reproduce.

- System
  full virtualized xen guest based on RHEL5.1(x86_64).
    CPU: 2
    memory: 2GB
    swap: 1GB
  A config of the running kernel(2.6.25-rc3-mm1 with your patch)
  is attached.

- how to reproduce
  - change swappines to 100

    echo 100 >/proc/sys/vm/swappiness

  - mount cgroup fs

    # mount -t cgroup -o memory,swap none /cgroup

  - make cgroup for test

    # mkdir /cgroup/02
    # echo -n 64M >/cgroup/02/memory.limit_in_bytes
    # echo -n `expr 128 \* 1024 \* 1024` >/cgroup/02/swap.limit_in_bytes

  - run test

    # echo $$ >/cgropu/02/tasks
    # while true; do make clean; make -j2; done

  In other terminals, I run some monitoring processes, top,
  "tail -f /var/log/messages", and displaying *.usage_in_bytes
  every seconds.


Thanks,
Daisuke Nishimura.