Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753034AbbHTIrf (ORCPT ); Thu, 20 Aug 2015 04:47:35 -0400 Received: from mail-wi0-f178.google.com ([209.85.212.178]:36254 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751448AbbHTIra (ORCPT ); Thu, 20 Aug 2015 04:47:30 -0400 Message-ID: <1440060446.3515.117.camel@gmail.com> Subject: Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy From: Mike Galbraith To: Tejun Heo Cc: Paul Turner , Peter Zijlstra , Ingo Molnar , Johannes Weiner , lizefan@huawei.com, cgroups , LKML , kernel-team , Linus Torvalds , Andrew Morton Date: Thu, 20 Aug 2015 10:47:26 +0200 In-Reply-To: <20150820075232.GA27917@mtj.duckdns.org> References: <20150804090711.GL25159@twins.programming.kicks-ass.net> <20150804151017.GD17598@mtj.duckdns.org> <20150805091036.GT25159@twins.programming.kicks-ass.net> <20150805143132.GK17598@mtj.duckdns.org> <20150818203117.GC15739@mtj.duckdns.org> <1439954620.3479.30.camel@gmail.com> <20150819164113.GB20716@mtj.duckdns.org> <1440043259.3515.84.camel@gmail.com> <20150820075232.GA27917@mtj.duckdns.org> 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: 879 Lines: 20 On Thu, 2015-08-20 at 00:52 -0700, Tejun Heo wrote: > Hmmm... I think this discussion got pretty badly derailed at this > point. If I'm not mistaken, you're talking about tens or a few > hundred millisecs of latency per migration which no longer exists and > won't ever come back and the discussion originally was about something > like migrating thread for issuing several IO requests versus bouncing > that to a dedicated issuer thread in that domain. Yes, ms latencies ever coming back is the concern, whether that be due to something akin to the old synchronize_rcu() horror.. or some handoff of whatever to whomever. -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/