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

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Date:	Sat, 09 May 2015 09:19:43 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	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>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	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 Sat, 2015-05-09 at 09:05 +0200, Ingo Molnar wrote:
> * Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > On Fri, 8 May 2015 19:11:10 -0400 Chris Metcalf <cmetcalf@...hip.com> wrote:
> > 
> > > On 5/8/2015 5:22 PM, Steven Rostedt wrote:
> > > > On Fri, 8 May 2015 14:18:24 -0700
> > > > Andrew Morton <akpm@...ux-foundation.org> wrote:
> > > >
> > > >> On Fri, 8 May 2015 13:58:41 -0400 Chris Metcalf <cmetcalf@...hip.com> wrote:
> > > >>
> > > >>> A prctl() option (PR_SET_DATAPLANE) is added
> > > >> Dumb question: what does the term "dataplane" mean in this context?  I
> > > >> can't see the relationship between those words and what this patch
> > > >> does.
> > > > I was thinking the same thing. I haven't gotten around to searching
> > > > DATAPLANE yet.
> > > >
> > > > I would assume we want a name that is more meaningful for what is
> > > > happening.
> > > 
> > > The text in the commit message and the 0/6 cover letter do try to explain
> > > the concept.  The terminology comes, I think, from networking line cards,
> > > where the "dataplane" is the part of the application that handles all the
> > > fast path processing of network packets, and the "control plane" is the part
> > > that handles routing updates, etc., generally slow-path stuff.  I've probably
> > > just been using the terms so long they seem normal to me.
> > > 
> > > That said, what would be clearer?  NO_HZ_STRICT as a superset of
> > > NO_HZ_FULL?  Or move away from the NO_HZ terminology a bit; after all,
> > > we're talking about no interrupts of any kind, and maybe NO_HZ is too
> > > limited in scope?  So, NO_INTERRUPTS?  USERSPACE_ONLY?  Or look
> > > to vendors who ship bare-metal runtimes and call it BARE_METAL?
> > > Borrow the Tilera marketing name and call it ZERO_OVERHEAD?
> > > 
> > > Maybe BARE_METAL seems most plausible -- after DATAPLANE, to me,
> > > of course :-)
> 
> 'baremetal' has uses in virtualization speak, so I think that would be 
> confusing.
> 
> > I like NO_INTERRUPTS.  Simple, direct.
> 
> NO_HZ_PURE?

Hm, coke light, coke zero... OS_LIGHT and OS_ZERO?

	-Mike

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