From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>
Cc: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
Dave Jones <davej-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Ben Hutchings <ben-/+tVBieCtBitmTQ+vhA3Yw@public.gmane.org>,
Peter Zijlstra
<a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>,
Paul Turner <pjt-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Lennart Poettering
<lennart-mdGvqq1h2p+GdvJs77BJ7Q@public.gmane.org>,
Kay Sievers <kay.sievers-tD+1rO4QERM@public.gmane.org>,
Kamezawa Hiroyuki
<kamezawa.hiroyu-+CUm20s59erQFUHtdCDX3A@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>
Subject: Re: [PATCH v2] memcg: first step towards hierarchical controller
Date: Wed, 5 Sep 2012 13:12:38 -0700 [thread overview]
Message-ID: <20120905201238.GE13737@google.com> (raw)
In-Reply-To: <20120905144942.GH5388-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
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.
> 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.
Thanks.
--
tejun
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: Glauber Costa <glommer@parallels.com>,
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: Wed, 5 Sep 2012 13:12:38 -0700 [thread overview]
Message-ID: <20120905201238.GE13737@google.com> (raw)
In-Reply-To: <20120905144942.GH5388@dhcp22.suse.cz>
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.
> 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.
Thanks.
--
tejun
--
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WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: Glauber Costa <glommer@parallels.com>,
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: Wed, 5 Sep 2012 13:12:38 -0700 [thread overview]
Message-ID: <20120905201238.GE13737@google.com> (raw)
In-Reply-To: <20120905144942.GH5388@dhcp22.suse.cz>
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.
> 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.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-09-05 20:12 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-03 15:46 [PATCH v2] memcg: first step towards hierarchical controller Glauber Costa
2012-09-03 15:46 ` Glauber Costa
[not found] ` <1346687211-31848-1-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-09-03 16:41 ` Ben Hutchings
2012-09-03 16:41 ` Ben Hutchings
2012-09-03 16:41 ` Ben Hutchings
[not found] ` <20120903164148.GS29217-/+tVBieCtBitmTQ+vhA3Yw@public.gmane.org>
2012-09-04 8:29 ` Glauber Costa
2012-09-04 8:29 ` Glauber Costa
2012-09-04 8:29 ` Glauber Costa
2012-09-03 17:08 ` Michal Hocko
2012-09-03 17:08 ` Michal Hocko
2012-09-04 8:34 ` Glauber Costa
2012-09-04 8:34 ` Glauber Costa
[not found] ` <5045BD25.10301-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-09-04 13:09 ` Michal Hocko
2012-09-04 13:09 ` Michal Hocko
2012-09-04 13:09 ` Michal Hocko
[not found] ` <20120904130905.GA15683-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-04 13:27 ` Glauber Costa
2012-09-04 13:27 ` Glauber Costa
2012-09-04 13:27 ` Glauber Costa
2012-09-04 14:35 ` Michal Hocko
2012-09-04 14:35 ` Michal Hocko
2012-09-04 14:35 ` Michal Hocko
2012-09-04 14:37 ` Glauber Costa
2012-09-04 14:37 ` Glauber Costa
2012-09-04 14:37 ` Glauber Costa
[not found] ` <50461241.5010300-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-09-04 14:54 ` Michal Hocko
2012-09-04 14:54 ` Michal Hocko
2012-09-04 14:54 ` Michal Hocko
[not found] ` <20120904145414.GC15683-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-04 14:54 ` Glauber Costa
2012-09-04 14:54 ` Glauber Costa
2012-09-04 14:54 ` Glauber Costa
[not found] ` <50461610.30305-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-09-04 16:25 ` Michal Hocko
2012-09-04 16:25 ` Michal Hocko
2012-09-04 16:25 ` Michal Hocko
[not found] ` <20120904162501.GE15683-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-05 8:14 ` Glauber Costa
2012-09-05 8:14 ` Glauber Costa
2012-09-05 8:14 ` Glauber Costa
[not found] ` <504709D4.2010800-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-09-05 14:49 ` Michal Hocko
2012-09-05 14:49 ` Michal Hocko
2012-09-05 14:49 ` Michal Hocko
[not found] ` <20120905144942.GH5388-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-05 20:12 ` Tejun Heo [this message]
2012-09-05 20:12 ` Tejun Heo
2012-09-05 20:12 ` Tejun Heo
[not found] ` <20120905201238.GE13737-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-06 12:06 ` Michal Hocko
2012-09-06 12:06 ` Michal Hocko
2012-09-06 12:06 ` Michal Hocko
2012-09-06 12:09 ` Glauber Costa
2012-09-06 12:09 ` Glauber Costa
[not found] ` <50489270.7060108-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-09-06 12:18 ` Michal Hocko
2012-09-06 12:18 ` Michal Hocko
2012-09-06 12:18 ` Michal Hocko
[not found] ` <20120906121842.GG22426-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-07 9:45 ` Glauber Costa
2012-09-07 9:45 ` Glauber Costa
2012-09-07 9:45 ` Glauber Costa
[not found] ` <20120904143552.GB15683-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2012-09-04 18:22 ` Tejun Heo
2012-09-04 18:22 ` Tejun Heo
2012-09-04 18:22 ` Tejun Heo
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