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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 13 May 2019 13:19:32 +0100 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x4DCJVSc38469680 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 13 May 2019 12:19:31 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 10A6AB2064; Mon, 13 May 2019 12:19:31 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E3F0AB205F; Mon, 13 May 2019 12:19:30 +0000 (GMT) Received: from paulmck-ThinkPad-W541 (unknown [9.85.145.78]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 13 May 2019 12:19:30 +0000 (GMT) Received: by paulmck-ThinkPad-W541 (Postfix, from userid 1000) id 1228816C319C; Mon, 13 May 2019 05:19:33 -0700 (PDT) Date: Mon, 13 May 2019 05:19:33 -0700 From: "Paul E. McKenney" To: Peter Zijlstra Cc: Steven Rostedt , linux-kernel@vger.kernel.org, andrea.parri@amarulasolutions.com, Thomas Gleixner , Ingo Molnar , Juri Lelli , Morten Rasmussen , joelaf@google.com, Vincent Guittot , Sebastian Andrzej Siewior Subject: Re: Question about sched_setaffinity() Reply-To: paulmck@linux.ibm.com References: <20190430115551.GT2623@hirez.programming.kicks-ass.net> <20190501191213.GX3923@linux.ibm.com> <20190501151655.51469a4c@gandalf.local.home> <20190501202713.GY3923@linux.ibm.com> <20190507221613.GA11057@linux.ibm.com> <20190509173654.GA23530@linux.ibm.com> <20190509193625.GA12455@linux.ibm.com> <20190510120819.GR2589@hirez.programming.kicks-ass.net> <20190510230742.GY3923@linux.ibm.com> <20190513081052.GJ2623@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190513081052.GJ2623@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 19051312-2213-0000-0000-0000038C98FB X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011092; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000285; SDB=6.01202707; UDB=6.00631243; IPR=6.00983623; MB=3.00026864; MTD=3.00000008; XFM=3.00000015; UTC=2019-05-13 12:19:35 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19051312-2214-0000-0000-00005E6A555D Message-Id: <20190513121933.GI3923@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-13_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905130087 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 13, 2019 at 10:10:52AM +0200, Peter Zijlstra wrote: > On Fri, May 10, 2019 at 04:07:42PM -0700, Paul E. McKenney wrote: > > > The below trace explain the issue. Some Paul person did it, see below. > > > It's broken per construction :-) > > > > *facepalm* Hence the very strange ->cpus_allowed mask. I really > > should have figured that one out. > > I guess it's called a torture framework for a reason ;-) Fair enough. And I doubt that this is the firs time that it has tortured other people rather than torturing RCU. ;-) Thanx, Paul