From: Michal Hocko <mhocko@suse.cz>
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, Dave Jones <davej@redhat.com>,
Ben Hutchings <ben@decadent.org.uk>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Turner <pjt@google.com>,
Lennart Poettering <lennart@poettering.net>,
Kay Sievers <kay.sievers@vrfy.org>,
Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH v2] memcg: first step towards hierarchical controller
Date: Thu, 6 Sep 2012 14:18:42 +0200 [thread overview]
Message-ID: <20120906121842.GG22426@dhcp22.suse.cz> (raw)
In-Reply-To: <50489270.7060108@parallels.com>
On Thu 06-09-12 16:09:20, Glauber Costa wrote:
> On 09/06/2012 04:06 PM, Michal Hocko wrote:
> > On Wed 05-09-12 13:12:38, Tejun Heo wrote:
> >> Hello, Michal.
> >>
> >> On Wed, Sep 05, 2012 at 04:49:42PM +0200, Michal Hocko wrote:
> >>> Can we settle on the following 3 steps?
> >>> 1) warn about "flat" hierarchies (give it X releases) - I will push it
> >>> to as many Suse code streams as possible (hope other distributions
> >>> could do the same)
> >>
> >> I think I'm just gonna trigger WARN from cgroup core if anyone tries
> >> to create hierarchy with a controller which doesn't support full
> >> hierarchy. WARN_ON_ONCE() at first and then WARN_ON() on each
> >> creation later on.
> >
> > How do you find out that a controller is not fully hierarchical? Memory
> > controller can be both.
> >
> >>> 2) flip the default on the root cgroup & warn when somebody tries to
> >>> change it to 0 (give it another X releases) that the knob will be
> >>> removed
> >>> 3) remove the knob and the whole nonsese
> >>> 4) revert 3 if somebody really objects
> >>
> >> If we can get to 3, I don't think 4 would be a problem.
> >
> > Agreed.
> >
> Just so I understand it:
>
> Michal clearly objected before folding his patch with my Kconfig patch.
> But is there still opposition to merge both?
I do not find the config option very much useful but if others feel it
really is I won't block it.
> By having it default-n, only people that are either sure that this is
> safe for them, or have more clearly defined lifecycles could set it.
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2012-09-06 12:18 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-03 15:46 Glauber Costa
2012-09-03 16:41 ` Ben Hutchings
2012-09-04 8:29 ` Glauber Costa
2012-09-03 17:08 ` Michal Hocko
2012-09-04 8:34 ` Glauber Costa
2012-09-04 13:09 ` Michal Hocko
2012-09-04 13:27 ` Glauber Costa
2012-09-04 14:35 ` Michal Hocko
2012-09-04 14:37 ` Glauber Costa
2012-09-04 14:54 ` Michal Hocko
2012-09-04 14:54 ` Glauber Costa
2012-09-04 16:25 ` Michal Hocko
2012-09-05 8:14 ` Glauber Costa
2012-09-05 14:49 ` Michal Hocko
2012-09-05 20:12 ` Tejun Heo
2012-09-06 12:06 ` Michal Hocko
2012-09-06 12:09 ` Glauber Costa
2012-09-06 12:18 ` Michal Hocko [this message]
2012-09-07 9:45 ` Glauber Costa
2012-09-04 18:22 ` Tejun Heo
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