From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751476AbdFHSPK (ORCPT ); Thu, 8 Jun 2017 14:15:10 -0400 Received: from www.llwyncelyn.cymru ([82.70.14.225]:57834 "EHLO fuzix.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751344AbdFHSPI (ORCPT ); Thu, 8 Jun 2017 14:15:08 -0400 Date: Thu, 8 Jun 2017 19:14:29 +0100 From: Alan Cox To: Ingo Molnar Cc: Nicolas Pitre , Ingo Molnar , Peter Zijlstra , linux-kernel@vger.kernel.org, Linus Torvalds , Thomas Gleixner Subject: Re: [PATCH v2 0/8] scheduler tinification Message-ID: <20170608191429.2e454aa9@lxorguk.ukuu.org.uk> In-Reply-To: <20170608075936.426zbwb63drsemgh@gmail.com> References: <20170606232450.30278-1-nicolas.pitre@linaro.org> <20170607160010.e2gtddlllflvr6er@gmail.com> <20170608075936.426zbwb63drsemgh@gmail.com> Organization: Intel Corporation X-Mailer: Claws Mail 3.14.1 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > As users ask for more features the the hardware capabilities will increase > dramatically and home-grown microcontroller derived code plus minimal OSes will be > replaced by a 'real' OS. Because both developers and users will demand IPv6 > compatibility, or Bluetooth connectivity, or storage support, or any random range > of features we have in the Linux kernel. There are already tiny OS's with that feature set but they don't feel Unixish and aren't quite so fun to program. > Even taking the 1MB size at face value (which I don't: a networking enabled system > can probably not function very well with just 1MB of RAM) - the RAM-starved 1 MB > system today will effectively be a 2 MB system in 2 years. Probably not - I may be wrong but power and what you can and can't put on the same die are likely to mean that small RAM devices are here for a while and in fact the CFO will be ordering the engineers to get it in less RAM to save 20 cents a unit. > And yes, I don't claim Moore's law will go on forever and I'm oversimplifying - > maybe things are slowing down and it will only be 1.5 MB, but the point remains: > the importance of your 20kb .text savings will become a 10-15k .text savings in > just 2 years. In 8 years today's 1 MB system will be a 32 MB system if that trend > holds up. Power means it's more likely IMHO that todays 256K RAM system will in a few years be either a 64K RAM system or have tons of persistent memory. Alan