linux-kernel - Re: [RFC][PATCH][0/3] introduce rlimit cgroup

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Date:	Thu, 24 Jul 2008 19:33:35 +0900
From:	Hirofumi Nakagawa <hnakagawa@...aclelinux.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	linux-kernel@...r.kernel.org, menage@...gle.com
Subject: Re: [RFC][PATCH][0/3] introduce rlimit cgroup

> Hi Nakagawa-san,
> 
>> Hello,
>>
>> I think existing rlimit interface isn't useful.
> 
> Why it isn't useful?
 > Please explain your motivation.
 >

Hi Kosaki-san,

I am sorry about lacking of explaination in my previous post.
I think setrlimit system call interface isn't useful.
Because it cannot set rlimit from other process.

>> So I created rlimit interface on cgroup.
>> Do you think this is a proper way todo it? (or Is there any similar methods already?)
>
> your rlimit controller is merely setting process rlimit to each task in the group.
>

To set rlimit from other processes is my original intention.
For I do not see a way to do it, please let me know if there were any exists.

 > So, it isn't almost people required action.

What is most people required action?

> At least, I don't think useful.
> 
>> # cat /dev/cgroup/rlimit.limits
>> Number  Limit                  Soft Limit       Hard Limit       Unit
>> 0       Max cpu time           unlimited        unlimited         ms
>> 1       Max file size          unlimited        unlimited         bytes
>> 2       Max data size          unlimited        unlimited         bytes
>> 3       Max stack size         8388608          unlimited         bytes
>> 4       Max core file size     0                unlimited         bytes
>> 5       Max resident set       unlimited        unlimited         bytes
>> 6       Max processes          16300            16300             processes
>> 7       Max open files         1024             1024              files
>> 8       Max locked memory      32768            32768             bytes
>> 9       Max address space      unlimited        unlimited         bytes
>> 10      Max file locks         unlimited        unlimited         locks
>> 11      Max pending signals    16300            16300             signals
>> 12      Max msgqueue size      819200           819200           bytes
>> 13      Max nice priority       0                0
>> 14      Max realtime priority   0                0
>> 15      Max realtime timeout    unlimited        unlimited        us
>> # echo "1 100000000 200000000" > /dev/cgroup/rlimit.limits
>> # cat /proc/zero > /tmp/hoge
> 
> in general, A complex setting file is thought as ugly.
> Why can't separate it?
> 

I agree.

thanks.

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