linux-kernel - Re: [RFC][PATCH] introduce task cgroup (#task restrictioon for prevent fork bomb by cgroup)

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Message-Id: <20080607160455.9C6C.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Sat, 07 Jun 2008 16:41:02 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Daniel Hokka Zakrisson" <daniel@...ac.com>
Cc:	kosaki.motohiro@...fujitsu.com, containers@...ts.osdl.org,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Li Zefan" <lizf@...fujitsu.com>, "Paul Menage" <menage@...gle.com>
Subject: Re: [RFC][PATCH] introduce task cgroup (#task restrictioon for  prevent fork bomb by cgroup)

> > I create new cgroup of number task restriction.
> > Please any comments!
> 
> Would it make more sense to implement this as part of an rlimit subsystem,
> which also supports limiting e.g. address space, CPU time, number of open
> files, etc.? If we create one subsystem per resource, I'm afraid we're
> going to see quite some time spent in all those loops, and the options for
> cgroupfs is going to become pretty long if you want to exclude just one or
> two of the subsystems for one particular mount point.

Good quistion.
task cgroup often different scope against memory, cputime, etc..

example.
	(<> mean cgroup name)

   +-----------------------------------------------------+
   | <interactive>  |         <service>                  |
   |   #task = 1000 |            #task = 5000            |
   +----------------+------------------+-----------------+
                    |  <serviceA>      |  <serviceB>     |
                    |    vaddr = 100GB |    vaddr = 200B |
                    +------------------+-----------------+

tus, we have 2 choice.

1. separate 2 cgroup.
2. implement hierarchy.

I afraid to 2 cause perfomance degression.
tus, I choiced 1.



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