From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Glauber Costa <glommer@parallels.com>
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, 05 Sep 2012 11:26:49 +0200 [thread overview]
Message-ID: <1346837209.2600.14.camel@twins> (raw)
In-Reply-To: <50471782.6060800@parallels.com>
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.
next prev parent reply other threads:[~2012-09-05 9:27 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 [this message]
2012-09-05 9:31 ` Glauber Costa
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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