Message-ID: <552E47A2.2000909@linux.vnet.ibm.com>
Date: Wed, 15 Apr 2015 16:42:34 +0530
From: Preeti U Murthy <preeti@linux.vnet.ibm.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0
MIME-Version: 1.0
To: Tejun Heo <tj@kernel.org>
CC: svaidy@linux.vnet.ibm.com, peterz@infradead.org, nacc@linux.vnet.ibm.com,
        rjw@rjwysocki.net, linux-kernel@vger.kernel.org, lizefan@huawei.com,
        anton@samba.org, bharata@linux.vnet.ibm.com, cgroups@vger.kernel.org,
        paulmck@linux.vnet.ibm.com, mingo@kernel.org, serge@hallyn.com
Subject: Re: [PATCH V2] cpuset: Add knob to make allowed masks hotplug invariant
 on legacy hierarchy
References: <20150410141118.11284.36206.stgit@preeti.in.ibm.com> <20150413145052.GC2596@htj.duckdns.org>
In-Reply-To: <20150413145052.GC2596@htj.duckdns.org>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1354
Lines: 34

On 04/13/2015 08:20 PM, Tejun Heo wrote:
> On Fri, Apr 10, 2015 at 07:41:52PM +0530, Preeti U Murthy wrote:
>> Moreover the default hierarchy keeps the allowed masks hotplug invariant
>> too. So the patch is not bringing about a fundamental change in the
>> design of cgroups.
> 
> This is gonna be a new behavior anyway and I don't follow why you just
> can't use the default hierarchy (well, of course except for that it
> isn't ready yet but no matter what we do this is gonna take another
> devel cycle so what's the difference?).  It's not like the default

Is it possible today to mount a specific controller on the default
hierarchy ? Or will this capability be going in the next merge window ?
I see that there are  no mount options except the __SANE__ one that the
default hierarchy takes.

We could mount the rest of the controllers in the legacy hierarchy while
mounting the cpuset controller alone in the default hierarchy and see if
this works fine.

Regards
Preeti U Murthy

> hierarchy requires invasive changes.  I'm not convinced this calls for
> yet another operation mode.
> 
> Thanks.
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/