linux-kernel - Re: [RFC] cgroup TODOs

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Message-ID: <CAPXgP13oHLt8pMJSJvbB9Q10h8zTfvFVb99d=za3Bu0BmyCZtg@mail.gmail.com>
Date:	Fri, 14 Sep 2012 23:51:06 +0200
From:	Kay Sievers <kay@...y.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, Neil Horman <nhorman@...driver.com>,
	Michal Hocko <mhocko@...e.cz>,
	Paul Mackerras <paulus@...ba.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Graf <tgraf@...g.ch>,
	"Serge E. Hallyn" <serue@...ibm.com>, Paul Turner <pjt@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Lennart Poettering <lennart@...ttering.net>
Subject: Re: [RFC] cgroup TODOs

On Fri, Sep 14, 2012 at 9:29 PM, Tejun Heo <tj@...nel.org> wrote:
> On Fri, Sep 14, 2012 at 09:58:30AM -0400, Vivek Goyal wrote:
>> I am little concerned about above and wondering how systemd and libvirt
>> will interact and behave out of the box.
>>
>> Currently systemd does not create its own hierarchy under blkio and
>> libvirt does. So putting all together means there is no way to avoid
>> the overhead of systemd created hierarchy.
>>
>> \
>> |
>> +- system
>>      |
>>      +- libvirtd.service
>>               |
>>               +- virt-machine1
>>               +- virt-machine2
>>
>> So there is now way to avoid the overhead of two levels of hierarchy
>> created by systemd. I really wish that systemd gets rid of "system"
>> cgroup and puts services directly in top level group. Creating deeper
>> hieararchices is expensive.

The idea here is to split equally between the "system" and the "user"s
at that level.

That all can be re-considered and changed if really needed, but it's
not an unintentionally created directory.

Thanks,
Kay
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