Date: Fri, 1 Sep 2017 00:58:18 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Rik van Riel <riel@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Chris Metcalf <cmetcalf@mellanox.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Luiz Capitulino <lcapitulino@redhat.com>,
        Christoph Lameter <cl@linux.com>,
        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
        Ingo Molnar <mingo@kernel.org>, Mike Galbraith <efault@gmx.de>,
        Wanpeng Li <kernellwp@gmail.com>
Subject: Re: [RFC PATCH 01/12] housekeeping: Move housekeeping related code
 to its own file
Message-ID: <20170831225816.GA18249@lerouge>
References: <1503453071-952-1-git-send-email-fweisbec@gmail.com>
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 <1504210576.12821.6.camel@redhat.com>
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On Thu, Aug 31, 2017 at 04:16:16PM -0400, Rik van Riel wrote:
> On Wed, 2017-08-23 at 03:51 +0200, Frederic Weisbecker wrote:
> > The housekeeping code is currently tied to the nohz code. As we are
> > planning to make housekeeping independant from it, start with moving
> > the relevant code to its own file.
> > 
> Why are nohz full and housekeeping being
> decoupled from each other?
> 
> Won't people want to use them together?
> 
> What use case am I missing?

So nohz is really just a feature and it shouldn't decide about other isolation
features. It should be the opposite: isolation picks up nohz, alongside other
isolation things. I think we did a layering misdesign. So it's mostly just a code
reorganisation.

While at it, isolcpus= is also part of the isolation toolset. So I thought we should
centralize all this isolation code in a common subsystem.