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

[Daniel Lezcano]

anqin wrote:
> Dear Daniel and Serge,
> 
> 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.


Cool, that looks like a very interesting feature :)

> 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 both of experts could give me some commend.
> I will continue to develop cgroup-related codes to make contribution to kernel
> development.

I am not sure I understand what you mean by "useful", but it seems you 
did an interesting feature. All the documentation related to submitting 
patches is in Documentation/SubmittingPatches, I hope that helps.

send your patches to lkml@ prefixed with [RFC] in the subject ('quilt' 
is your friend). If the functionality already exists, someone will tell you.

Thanks.
  -- Daniel
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