Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753816AbbEIHTv (ORCPT ); Sat, 9 May 2015 03:19:51 -0400 Received: from mail-wi0-f169.google.com ([209.85.212.169]:38415 "EHLO mail-wi0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753773AbbEIHTr (ORCPT ); Sat, 9 May 2015 03:19:47 -0400 Message-ID: <1431155983.3209.131.camel@gmail.com> Subject: Re: [PATCH 0/6] support "dataplane" mode for nohz_full From: Mike Galbraith To: Ingo Molnar Cc: Andrew Morton , Chris Metcalf , Steven Rostedt , Gilad Ben Yossef , Ingo Molnar , Peter Zijlstra , Rik van Riel , Tejun Heo , Frederic Weisbecker , Thomas Gleixner , "Paul E. McKenney" , Christoph Lameter , "Srivatsa S. Bhat" , linux-doc@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org Date: Sat, 09 May 2015 09:19:43 +0200 In-Reply-To: <20150509070538.GA9413@gmail.com> References: <1431107927-13998-1-git-send-email-cmetcalf@ezchip.com> <20150508141824.797eb0d89d514e39fd30fffe@linux-foundation.org> <20150508172210.559830a9@gandalf.local.home> <554D428E.6020702@ezchip.com> <20150508161909.308d60e21f6b83b897174276@linux-foundation.org> <20150509070538.GA9413@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.11 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2345 Lines: 54 On Sat, 2015-05-09 at 09:05 +0200, Ingo Molnar wrote: > * Andrew Morton wrote: > > > On Fri, 8 May 2015 19:11:10 -0400 Chris Metcalf wrote: > > > > > On 5/8/2015 5:22 PM, Steven Rostedt wrote: > > > > On Fri, 8 May 2015 14:18:24 -0700 > > > > Andrew Morton wrote: > > > > > > > >> On Fri, 8 May 2015 13:58:41 -0400 Chris Metcalf 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 -- 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/