Date: Tue, 12 May 2015 13:48:09 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Chris Metcalf <cmetcalf@ezchip.com>, Steven Rostedt <rostedt@goodmis.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>, paulmck@linux.vnet.ibm.com,
        Gilad Ben Yossef <giladb@ezchip.com>, Rik van Riel <riel@redhat.com>,
        Tejun Heo <tj@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
        Christoph Lameter <cl@linux.com>,
        "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
        linux-doc@vger.kernel.org, linux-api@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: CONFIG_ISOLATION=y (was: [PATCH 0/6] support "dataplane" mode
 for nohz_full)
Message-ID: <20150512114809.GL21418@twins.programming.kicks-ass.net>
References: <554D428E.6020702@ezchip.com>
 <20150508161909.308d60e21f6b83b897174276@linux-foundation.org>
 <20150509070538.GA9413@gmail.com>
 <20150511085759.71deeb64@gandalf.local.home>
 <20150511171916.GN6776@linux.vnet.ibm.com>
 <20150511102744.9ebb2d05a7e8b457d03430bf@linux-foundation.org>
 <20150511173305.GC32512@lerouge>
 <20150511140009.1f7bcf07@gandalf.local.home>
 <5550F077.6030906@ezchip.com>
 <20150512091032.GA10138@gmail.com>
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On Tue, May 12, 2015 at 11:10:32AM +0200, Ingo Molnar wrote:
> 
> So I'd vote for Frederic's CONFIG_ISOLATION=y, mostly because this is 
> a high level kernel feature, so it won't conflict with isolation 
> concepts in lower level subsystems such as IOMMU isolation - and other 
> higher level features like scheduler isolation are basically another 
> partial implementation we want to merge with all this...
> 

But why do we need a CONFIG flag for something that has no content?

That is, I do not see anything much; except the 'I want to stay in
userspace and kill me otherwise' flag, and I'm not sure that warrants a
CONFIG flag like this.

Other than that, its all a combination of NOHZ_FULL and cpusets/isolcpus
and whatnot.
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