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From: Glauber Costa <glommer@parallels.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tejun Heo <tj@kernel.org>, <linux-kernel@vger.kernel.org>,
	<cgroups@vger.kernel.org>, <linux-mm@kvack.org>,
	<davej@redhat.com>, <ben@decadent.org.uk>, <pjt@google.com>,
	<lennart@poettering.net>, <kay.sievers@vrfy.org>
Subject: Re: [RFC 0/5] forced comounts for cgroups.
Date: Wed, 5 Sep 2012 13:31:56 +0400	[thread overview]
Message-ID: <50471C0C.7050600@parallels.com> (raw)
In-Reply-To: <1346837209.2600.14.camel@twins>

On 09/05/2012 01:26 PM, Peter Zijlstra wrote:
> On Wed, 2012-09-05 at 13:12 +0400, Glauber Costa wrote:
>> On 09/05/2012 01:11 PM, Tejun Heo wrote:
>>> Hello, Peter.
>>>
>>> On Wed, Sep 05, 2012 at 11:06:33AM +0200, Peter Zijlstra wrote:
>>>> *confused* I always thought that was exactly what you meant with unified
>>>> hierarchy.
>>>
>>> No, I never counted out differing granularity.
>>>
>>
>> Can you elaborate on which interface do you envision to make it work?
>> They will clearly be mounted in the same hierarchy, or as said
>> alternatively, comounted.
>>
>> If you can turn them on/off on a per-subtree basis, which interface
>> exactly do you propose for that?
> 
> I wouldn't, screw that. That would result in the exact same problem
> we're trying to fix. I want a single hierarchy walk, that's expensive
> enough.
> 
>> Would a pair of cgroup core files like available_controllers and
>> current_controllers are a lot of drivers do, suffice?
> 
> No.. its not a 'feature' I care to support for 'my' controllers.
> 
> I simply don't want to have to do two (or more) hierarchy walks for
> accounting on every schedule event, all that pointer chasing is stupidly
> expensive.
> 

You wouldn't have to do more than one hierarchy walks for that. What
Tejun seems to want, is the ability to not have a particular controller
at some point in the tree. But if they exist, they are always together.



  reply	other threads:[~2012-09-05  9:35 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-04 14:18 Glauber Costa
2012-09-04 14:18 ` [RFC 1/5] cgroup: allow some comounts to be forced Glauber Costa
2012-09-04 14:18 ` [RFC 2/5] sched: adjust exec_clock to use it as cpu usage metric Glauber Costa
2012-09-04 14:18 ` [RFC 3/5] sched: do not call cpuacct_charge when cpu and cpuacct are comounted Glauber Costa
2012-09-04 14:18 ` [RFC 4/5] cpuacct: do not gather cpuacct statistics when not mounted Glauber Costa
2012-09-04 14:18 ` [RFC 5/5] sched: add cpusets to comounts list Glauber Costa
2012-09-04 21:46 ` [RFC 0/5] forced comounts for cgroups Tejun Heo
2012-09-05  8:03   ` Glauber Costa
2012-09-05  8:14     ` Tejun Heo
2012-09-05  8:17       ` Glauber Costa
2012-09-05  8:29         ` Tejun Heo
2012-09-05  8:35           ` Glauber Costa
2012-09-05  8:47             ` Tejun Heo
2012-09-05  8:55               ` Glauber Costa
2012-09-05  9:07                 ` Tejun Heo
2012-09-05  9:06                   ` Glauber Costa
2012-09-05  9:14                     ` Tejun Heo
2012-09-05  9:06               ` Peter Zijlstra
2012-09-05  9:07                 ` Peter Zijlstra
2012-09-05  9:22                   ` Tejun Heo
2012-09-05  9:11                 ` Tejun Heo
2012-09-05  9:12                   ` Glauber Costa
2012-09-05  9:19                     ` Tejun Heo
2012-09-05  9:30                       ` Glauber Costa
2012-09-05  9:26                     ` Peter Zijlstra
2012-09-05  9:31                       ` Glauber Costa [this message]
2012-09-05  9:45                         ` Tejun Heo
2012-09-05  9:48                           ` Glauber Costa
2012-09-05  9:56                             ` Tejun Heo
2012-09-05 10:20                         ` Peter Zijlstra
2012-09-06 20:38                           ` Tejun Heo
2012-09-06 22:39                             ` Glauber Costa
2012-09-06 22:45                               ` Tejun Heo
2012-09-05  9:32                 ` Tejun Heo
2012-09-05 10:04                   ` Peter Zijlstra
2012-09-06 20:46                     ` Tejun Heo
2012-09-06 21:11                       ` Paul Turner
2012-09-06 22:36                         ` Glauber Costa
2012-09-08 13:36                         ` Dhaval Giani

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