From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: linux kernel mailing list <linux-kernel@vger.kernel.org>,
Libcg Devel Mailing List <libcg-devel@lists.sourceforge.net>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Dhaval Giani <dhaval@linux.vnet.ibm.com>,
Paul Menage <menage@google.com>,
Peter Zijlstra <pzijlstr@redhat.com>,
Kazunaga Ikeno <k-ikeno@ak.jp.nec.com>,
Morton Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC] How to handle the rules engine for cgroups
Date: Thu, 3 Jul 2008 10:19:57 +0900 [thread overview]
Message-ID: <20080703101957.b3856904.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <20080701191126.GA17376@redhat.com>
On Tue, 1 Jul 2008 15:11:26 -0400
Vivek Goyal <vgoyal@redhat.com> wrote:
> Hi,
>
> While development is going on for cgroup and various controllers, we also
> need a facility so that an admin/user can specify the group creation and
> also specify the rules based on which tasks should be placed in respective
> groups. Group creation part will be handled by libcg which is already
> under development. We still need to tackle the issue of how to specify
> the rules and how these rules are enforced (rules engine).
>
> I have gathered few views, with regards to how rule engine can possibly be
> implemented, I am listing these down.
>
> Proposal 1
> ==========
> Let user space daemon hanle all that. Daemon will open a netlink socket
> and receive the notifications for various kernel events. Daemon will
> also parse appropriate admin specified rules config file and place the
> processes in right cgroup based on rules as and when events happen.
>
> I have written a prototype user space program which does that. Program
> can be found here. Currently it is in very crude shape.
>
> http://people.redhat.com/vgoyal/misc/rules-engine-daemon/user-id-based-namespaces.patch
>
> Various people have raised two main issues with this approach.
>
> - netlink is not a reliable protocol.
> - Messages can be dropped and one can loose message. That means a
> newly forked process might never go into right group as meant.
>
> - How to handle delays in rule exectuion?
> - For example, if an "exec" happens and by the time process is moved to
> right group, it might have forked off few more processes or might
> have done quite some amount of memory allocation which will be
> charged to the wring group. Or, newly exec process might get
> killed in existing cgroup because of lack of memory (despite the
> fact that destination cgroup has sufficient memory).
>
Hmm, can't we rework the process event connector to use some reliable
fast interface besides netlink ? (I mean an interface like eventpoll.)
(Or enhance netlink ? ;)
Because "a child inherits parent's" rule is very strong, I think the amount
of events we have to check is much less than we get report. Can't we add some
filter/assumption here ?
BTW, the placement of proc_exec_connector() is not too late ? It seems memory for
creating exec-image is charged to original group...
Thanks,
-Kame
next prev parent reply other threads:[~2008-07-03 1:21 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-01 19:11 [RFC] How to handle the rules engine for cgroups Vivek Goyal
2008-07-02 9:33 ` Kazunaga Ikeno
2008-07-03 1:19 ` KAMEZAWA Hiroyuki [this message]
2008-07-03 15:54 ` Vivek Goyal
2008-07-04 0:34 ` KAMEZAWA Hiroyuki
2008-07-04 3:17 ` Li Zefan
2008-07-08 9:35 ` Balbir Singh
2008-07-08 13:45 ` Vivek Goyal
2008-07-10 9:23 ` Paul Menage
2008-07-10 14:30 ` Vivek Goyal
2008-07-10 15:42 ` Dhaval Giani
2008-07-10 16:51 ` Paul Menage
2008-07-10 14:48 ` Rik van Riel
2008-07-10 15:40 ` Vivek Goyal
2008-07-10 15:56 ` Ulrich Drepper
2008-07-10 17:25 ` Rik van Riel
2008-07-10 17:39 ` Ulrich Drepper
2008-07-10 18:41 ` Vivek Goyal
2008-07-10 22:29 ` Ulrich Drepper
2008-07-11 0:55 ` KAMEZAWA Hiroyuki
2008-07-14 13:57 ` Vivek Goyal
2008-07-14 14:44 ` David Collier-Brown
2008-07-14 15:21 ` Vivek Goyal
2008-07-17 7:05 ` Kazunaga Ikeno
2008-07-17 13:47 ` Vivek Goyal
[not found] ` <20080717170717.GA3718@linux.vnet.ibm.com>
2008-07-18 8:12 ` [Libcg-devel] " Dhaval Giani
2008-07-18 20:12 ` Vivek Goyal
2008-08-17 10:33 ` [RFC] [PATCH -mm] cgroup: uid-based rules to add processes efficiently in the right cgroup Andrea Righi
2008-08-18 12:35 ` Vivek Goyal
2008-08-19 14:35 ` righi.andrea
2008-08-18 21:05 ` Paul Menage
2008-08-19 12:57 ` Vivek Goyal
2008-08-26 0:54 ` Paul Menage
2008-08-26 13:41 ` Vivek Goyal
2008-08-26 14:35 ` Balbir Singh
2008-08-26 15:04 ` David Collier-Brown
2008-08-26 16:00 ` Vivek Goyal
2008-08-26 16:32 ` David Collier-Brown
2008-08-26 16:08 ` Vivek Goyal
2008-09-04 18:25 ` Paul Menage
2008-08-19 15:12 ` righi.andrea
2008-08-26 0:55 ` Paul Menage
2008-07-14 15:07 ` Re: [RFC] How to handle the rules engine for cgroups kamezawa.hiroyu
2008-07-10 9:07 ` Paul Menage
2008-07-10 14:06 ` Vivek Goyal
2008-07-10 16:41 ` Paul Menage
2008-07-10 17:19 ` Vivek Goyal
2008-07-10 17:27 ` [Libcg-devel] " Dhaval Giani
2008-07-10 14:33 ` Vivek Goyal
2008-07-10 16:46 ` Paul Menage
2008-07-10 17:18 ` [Libcg-devel] " Dhaval Giani
2008-07-10 17:30 ` Paul Menage
2008-07-10 17:44 ` Dhaval Giani
2008-07-10 15:49 ` Dhaval Giani
2008-07-18 9:52 ` KAMEZAWA Hiroyuki
2008-07-18 15:46 ` Paul Menage
2008-07-18 16:39 ` Balbir Singh
2008-07-18 18:55 ` Vivek Goyal
2008-07-18 23:05 ` kamezawa.hiroyu
2008-07-18 23:10 ` kamezawa.hiroyu
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