From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752316AbcAFIVK (ORCPT ); Wed, 6 Jan 2016 03:21:10 -0500 Received: from casper.infradead.org ([85.118.1.10]:40597 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752262AbcAFIVI (ORCPT ); Wed, 6 Jan 2016 03:21:08 -0500 Date: Wed, 6 Jan 2016 09:21:06 +0100 From: Peter Zijlstra To: One Thousand Gnomes Cc: ling.ma.program@gmail.com, waiman.long@hpe.com, mingo@redhat.com, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, ling.ml@alibaba-inc.com Subject: Re: [RFC PATCH] alispinlock: acceleration from lock integration on multi-core platform Message-ID: <20160106082106.GU6373@twins.programming.kicks-ass.net> References: <1451549374-30875-1-git-send-email-ling.ma.program@gmail.com> <20160105211834.GR6344@twins.programming.kicks-ass.net> <20160105214227.3a2adcd2@lxorguk.ukuu.org.uk> <20160106081643.GS6344@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160106081643.GS6344@twins.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 06, 2016 at 09:16:43AM +0100, Peter Zijlstra wrote: > On Tue, Jan 05, 2016 at 09:42:27PM +0000, One Thousand Gnomes wrote: > > > It suffers the typical problems all those constructs do; namely it > > > wrecks accountability. > > > > That's "government thinking" ;-) - for most real users throughput is > > more important than accountability. With the right API it ought to also > > be compile time switchable. > > Its to do with having been involved with -rt. RT wants to do > accountability for such things because of PI and sorts. Also, real people really do care about latency too, very bad worst case spikes to upset things.