Re: [RFC][PATCH] another swap controller for cgroup

From: Daisuke Nishimura <nishimura-YQH0OdQVrdy45+QrQBaojngSJqDPrsil@public.gmane.org>
To: YAMAMOTO Takashi <yamamoto-jCdQPDEk3idL9jVzuh4AOg@public.gmane.org>
Cc: minoura-jCdQPDEk3idL9jVzuh4AOg@public.gmane.org,
	linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
	containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org,
	hugh-DTz5qymZ9yRBDgjK7y7TUQ@public.gmane.org,
	balbir-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org
Subject: Re: [RFC][PATCH] another swap controller for cgroup
Date: Fri, 28 Mar 2008 18:00:33 +0900	[thread overview]
Message-ID: <47ECB3B1.6040500@mxp.nes.nec.co.jp> (raw)
In-Reply-To: <20080327062834.DAB7E5A02-Pcsii4f/SVk@public.gmane.org>

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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.

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