[Devel] Fwd: [PATCH] cgroup for disk quota

[anqin]

---------- Forwarded message ----------
From: anqin <anqin.qin at gmail.com>
Date: Fri, Feb 20, 2009 at 4:28 PM
Subject: [PATCH] cgroup for disk quota
To: Daniel Lezcano <dlezcano at fr.ibm.com>, "Serge E. Hallyn"
<serue at us.ibm.com>, containers at lists.osdl.org
Cc: Ian jonhson <jonhson.ian at gmail.com>


Dear all,

For unified management of resources (CPU, memory, disk, network),
I (and Ian) developed a cgroup subsystem to control the usage
of disk quota.

The subsystem for disk quota (disk_cgroup, to be brief) does accounting
of inode and block allocated by ext3/ext2 filesystem. Simarily as
filesystem quota, the disk_cgroup can do limitation but without needing
to open filesytem quota options (e.g. usrquota,grpquota in /etc/fstab).
Since this patch is first developed, it needs more feedback and testing
from other developers or users.

The simple usage of disk_cgroup is as follows:

# mount -t cgroup cgroup /mnt/cgrp
# lxc-execute -n lxc-template.conf /bin/bash
# ls /mnt/cgrp/11457/           // <--  11457 is the pid of bash
...
disk.stat
disk.usage_in_inode
disk.usage_in_block
disk.max_usage_in_inode
disk.max_usage_in_block
disk.limit_in_inode
disk.limit_in_inode
...

# echo  3 > /mnt/cgrp/11457/disk.max_usage_in_block

# touch /tmp/mytestfile1
# touch /tmp/mytestfile2
# touch /tmp/mytestfile3
# touch /tmp/mytestfile4
touch: cannot touch `/tmp/mytestfile4': Disk quota exceeded

The disk_cgroup is easily extended to manage complex objects
of filesystem.

BTW, I don't know how to submit a "useful" patch to kernel community. Or,
maybe the patch is not useful at all and maybe has been developed by other
developers. I very appreciate if experts could give me some commend.
I will continue to develop cgroup-related codes to make contribution to kernel
development.

Any comment is welcome,

Anqin
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