linux-kernel - Re: [PATCH 0/6] support "dataplane" mode for nohz

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Message-ID: <20150511140009.1f7bcf07@gandalf.local.home>
Date:	Mon, 11 May 2015 14:00:09 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	paulmck@...ux.vnet.ibm.com, Ingo Molnar <mingo@...nel.org>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Gilad Ben Yossef <giladb@...hip.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Lameter <cl@...ux.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	linux-doc@...r.kernel.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] support "dataplane" mode for nohz_full

On Mon, 11 May 2015 19:33:06 +0200
Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Mon, May 11, 2015 at 10:27:44AM -0700, Andrew Morton wrote:
> > On Mon, 11 May 2015 10:19:16 -0700 "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> > 
> > > On Mon, May 11, 2015 at 08:57:59AM -0400, Steven Rostedt wrote:
> > > > 
> > > > NO_HZ_LEAVE_ME_THE_FSCK_ALONE!
> > > 
> > > NO_HZ_OVERFLOWING?
> > 
> > Actually, "NO_HZ" shouldn't appear in the name at all.  The objective
> > is to permit userspace to execute without interruption.  NO_HZ is a
> > part of that, as is NO_INTERRUPTS.  The "NO_HZ" thing is a historical
> > artifact from an early partial implementation.
> 
> Agreed! Which is why I'd rather advocate in favour of CONFIG_ISOLATION.

Then we should have CONFIG_LEAVE_ME_THE_FSCK_ALONE. Hmm, I guess that's
just an synonym for CONFIG_ISOLATION.

-- Steve
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