Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752110AbdI1QZA (ORCPT ); Thu, 28 Sep 2017 12:25:00 -0400 Received: from omzsmtpe03.verizonbusiness.com ([199.249.25.208]:11519 "EHLO omzsmtpe03.verizonbusiness.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752024AbdI1QY7 (ORCPT ); Thu, 28 Sep 2017 12:24:59 -0400 From: "Levin, Alexander (Sasha Levin)" X-Host: discovery.odc.vzwcorp.com To: Peter Zijlstra CC: "Paul E. McKenney" , Sasha Levin , "linux-kernel@vger.kernel.org List" , Ingo Molnar , "jiangshanlai@gmail.com" , "dipankar@in.ibm.com" , Andrew Morton , "Mathieu Desnoyers" , Josh Triplett , Thomas Gleixner , Steven Rostedt , "dhowells@redhat.com" , "Eric Dumazet" , Fr?d?ric Weisbecker , Oleg Nesterov , "bobby.prani@gmail.com" Subject: Re: [PATCH v3 tip/core/rcu 40/40] rcu: Make non-preemptive schedule be Tasks RCU quiescent state Thread-Topic: [PATCH v3 tip/core/rcu 40/40] rcu: Make non-preemptive schedule be Tasks RCU quiescent state Thread-Index: AQHTOHYsWOLGHkBKIU6/z4vDO3V24g== Date: Thu, 28 Sep 2017 16:23:52 +0000 Message-ID: <20170928162350.tmlv5aozsgxtv6lt@sasha-lappy> References: <20170419165805.GB10874@linux.vnet.ibm.com> <1492621117-13939-40-git-send-email-paulmck@linux.vnet.ibm.com> <20170928123055.GI3521@linux.vnet.ibm.com> <20170928153813.7cernglt2d7umhpe@sasha-lappy> <20170928160856.vi4n5tq4kgcevkv4@hirez.programming.kicks-ass.net> In-Reply-To: <20170928160856.vi4n5tq4kgcevkv4@hirez.programming.kicks-ass.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: NeoMutt/20170113 (1.7.2) x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.144.60.250] Content-Type: text/plain; charset="us-ascii" Content-ID: <049A1BE22E41FB4C9812CF1BE5F70C7C@vzwcorp.com> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id v8SGP7u7002170 Content-Length: 574 Lines: 17 On Thu, Sep 28, 2017 at 06:08:56PM +0200, Peter Zijlstra wrote: >On Thu, Sep 28, 2017 at 03:38:16PM +0000, Levin, Alexander (Sasha Levin) wrote: >> On Thu, Sep 28, 2017 at 05:30:55AM -0700, Paul E. McKenney wrote: > >> >Hmmm... kernel/rcu/tree_plugin.h:329 thinks that someone slept (as opposed >> >to was preempted) in an RCU read-side critical section. > >Sasha, was this on one of those kernels that did a printk() from >scheduler context? No, it was an older kernel (about a month old -next), I also didn't do any CPU hotplug in this set of tests. -- Thanks, Sasha