From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751192AbdFCFSr (ORCPT ); Sat, 3 Jun 2017 01:18:47 -0400 Received: from mail-qk0-f178.google.com ([209.85.220.178]:34394 "EHLO mail-qk0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751167AbdFCFSq (ORCPT ); Sat, 3 Jun 2017 01:18:46 -0400 Date: Sat, 3 Jun 2017 01:18:43 -0400 (EDT) From: Nicolas Pitre To: "Paul E. McKenney" cc: linux-kernel@vger.kernel.org, josh@joshtriplett.org Subject: Re: [PATCH RFC tip/core/rcu] Make SRCU be once again optional In-Reply-To: <20170603035915.GA23375@linux.vnet.ibm.com> Message-ID: References: <20170428211546.GA23590@linux.vnet.ibm.com> <20170429001040.GH3956@linux.vnet.ibm.com> <20170512184155.GA9482@linux.vnet.ibm.com> <20170512191005.GE3956@linux.vnet.ibm.com> <20170603035915.GA23375@linux.vnet.ibm.com> User-Agent: Alpine 2.20 (LFD 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2 Jun 2017, Paul E. McKenney wrote: > On Fri, May 12, 2017 at 12:10:05PM -0700, Paul E. McKenney wrote: > > On Fri, May 12, 2017 at 02:59:48PM -0400, Nicolas Pitre wrote: > > > On Fri, 12 May 2017, Paul E. McKenney wrote: > > [ . . . ] > > > > No. "Available in mainline" is the name of the game for all I do. If it > > > can't be made acceptable for mainline then it basically has no chance of > > > gaining traction and becoming generally useful. My approach is therefore > > > to always find solutions that can be maintained upstream and contributed > > > to with minimal fuss by anyone. > > > > OK, then wish me luck. ;-) > > And still quite a bit of back and forth. How are things with tty? > > One question that came up -- what sort of SoCs are you targeting? > A number of people are insisting that smartphone SoCs with 256M DRAM > are the minimal systems of the future. This seems unlikely to me, > given the potential for extremely cheap SoCs with EDRAM or some such, > but figured I should ask what you are targeting. I'm targetting 256 *kilobytes* of RAM. Most likely SRAM. That's not for smart phones but really cheap IoT devices. That's the next area for (trimmed down) Linux to conquer. Example targets are STM32 chips. Please see the following for the rationale and how to get there: https://lwn.net/Articles/721074/ http://www.mail-archive.com/search?l=mid&q=alpine.LFD.2.20.1703241215540.2304%40knanqh.ubzr Nicolas