linux-kernel - Re: [RFC] How to handle the rules engine for cgroups

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Date:	Mon, 14 Jul 2008 10:44:43 -0400
From:	David Collier-Brown <davecb@....com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Paul Menage <menage@...gle.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Libcg Devel Mailing List <libcg-devel@...ts.sourceforge.net>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Peter Zijlstra <pzijlstr@...hat.com>,
	Kazunaga Ikeno <k-ikeno@...jp.nec.com>,
	Morton Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Graf <tgraf@...hat.com>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [RFC] How to handle the rules engine for cgroups

Vivek Goyal wrote:
> If admin has decided to group applications and has written the rules for
> it then applications should not know anything about grouping. So I think
> application writing an script for being placed into the right group should
> be out of question. Now how does an admin write a wrapper around existing
> application without breaking anything else.

In the Solaris world, processes are placed into cgroups (projects) by
one of two mechanisms:

1) inheritance, with everything I create in my existing project.
   To get this started, there is a mechanism under login/getty/whatever 
   reading the /etc/projects file and, for example, tossing user davecb 
   into a "user.davecb" project.

2) explicit placement with newtask, which starts a program or moves
   a process into a project/cgroup

I have a "bg" project which I use for limiting resource consumption of
background jobs, and a background command which either starts or moves
jobs, thusly:

 case "$1" in
 [0-9]*) # It's a pid
         newtask -p bg -c $1
         ;;
  *) # It's a command-line
         newtask -p bg "$@" &
         ;;
  esac

A rules engine would be more useful for managing workloads once
they're assigned, as IBM does on the mainframe with WLM and goal-directed
resource management. (They're brilliant in this area, by the way, so
I'd be inclined to steal ideas from them  (;-))

--dave
-- 
David Collier-Brown            | Always do right. This will gratify
Sun Microsystems, Toronto      | some people and astonish the rest
davecb@....com                 |                      -- Mark Twain
(905) 943-1983, cell: (647) 833-9377, (800) 555-9786 x56583
bridge: (877) 385-4099 code: 506 9191#
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