linux-kernel - Re: [Workman-devel] cgroup: status-quo and userland efforts

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Message-ID: <20130723144816.GK8677@dhcp22.suse.cz>
Date:	Tue, 23 Jul 2013 16:48:16 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>, Tim Hockin <thockin@...kin.org>,
	Mike Galbraith <bitbucket@...ine.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Containers <containers@...ts.linux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	lpoetter <lpoetter@...hat.com>,
	workman-devel <workman-devel@...hat.com>,
	"dhaval.giani" <dhaval.giani@...il.com>,
	Cgroups <cgroups@...r.kernel.org>,
	bsingharora <bsingharora@...il.com>
Subject: Re: [Workman-devel] cgroup: status-quo and userland efforts

On Mon 15-07-13 14:49:40, Vivek Goyal wrote:
> On Sun, Jun 30, 2013 at 08:38:38PM +0200, Michal Hocko wrote:
> > On Fri 28-06-13 14:01:55, Vivek Goyal wrote:
> > > On Fri, Jun 28, 2013 at 05:05:13PM +0200, Michal Hocko wrote:
> > [...]
> > > > OK, so libcgroup's rules daemon will still work and place my tasks in
> > > > appropriate cgroups?
> > > 
> > > Do you use that daemon in practice?
> > 
> > I am not but my users do. And that is why I care.
> 
> Michael, 
> 
> would you have more details of how those users are exactly using
> rules engine daemon.

The most common usage is uid and exec names.

> To me rulesengined processed 3 kinds of rules.
> 
> - uid based
> - gid based
> - exec file path based
> 
> uid/gid based rule exection can be taken care by pam_cgroup module too.
> So I think one should not need cgrulesengined for that.

I am not familiar with pam_cgroup much but it is a part of libcgroup
package, right?

> I am curious what kind of exec rules are useful. Any placement of
> services one can do using systemd. So only executables we are left
> to manage are which are not services. 

Yes, those are usually backup processes which should not disrupt the
regular server workload.

uid ones are used to keep a leash on local users of the machine but i do
not have many details as I usually do not have access to those machines.
All I see are complains when something explodes ;)
-- 
Michal Hocko
SUSE Labs
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