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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 19 Mar 2019 16:49:18 -0000 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x2JGnIGW20840516 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 19 Mar 2019 16:49:18 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 91088B2064; Tue, 19 Mar 2019 16:49:18 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 73298B205F; Tue, 19 Mar 2019 16:49:18 +0000 (GMT) Received: from paulmck-ThinkPad-W541 (unknown [9.70.82.188]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 19 Mar 2019 16:49:18 +0000 (GMT) Received: by paulmck-ThinkPad-W541 (Postfix, from userid 1000) id BDC9616C2956; Tue, 19 Mar 2019 09:50:07 -0700 (PDT) Date: Tue, 19 Mar 2019 09:50:07 -0700 From: "Paul E. McKenney" To: Sebastian Andrzej Siewior Cc: linux-kernel@vger.kernel.org, Josh Triplett , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Joel Fernandes , tglx@linutronix.de, Mike Galbraith Subject: Re: [PATCH v2] rcu: Allow to eliminate softirq processing from rcutree Reply-To: paulmck@linux.ibm.com References: <20190315111130.4902-1-bigeasy@linutronix.de> <20190318022434.GE4102@linux.ibm.com> <20190319114419.qlsw3i5bmndoyvao@linutronix.de> <20190319155923.GY4102@linux.ibm.com> <20190319162431.4w2dqtssqkx6t4pq@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190319162431.4w2dqtssqkx6t4pq@linutronix.de> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 19031916-0064-0000-0000-000003BC7819 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010786; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000281; SDB=6.01176682; UDB=6.00615484; IPR=6.00957369; MB=3.00026056; MTD=3.00000008; XFM=3.00000015; UTC=2019-03-19 16:49:20 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19031916-0065-0000-0000-00003CC5A0F8 Message-Id: <20190319165007.GB4102@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-03-19_08:,, 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-1903190123 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 19, 2019 at 05:24:31PM +0100, Sebastian Andrzej Siewior wrote: > On 2019-03-19 08:59:23 [-0700], Paul E. McKenney wrote: > > I doubt that there is any code left from my original, so I set you as > > author. > > I always forward ported it the patch over the years. So if it is no > longer what it was once so be it. Besides, it looks very weird for me to have two Signed-off-by lines. ;-) > > I queued this and am starting tests without setting rcunosoftirq, > > and will run more later setting it, courtesy of --bootargs. > > oki. > > > Steve Rostedt did raise a good question about adding event tracing to > > the park functions. I haven't really settled on an answer yet. Thoughts? > > It should trigger CPU hotplug events. If there was something similar for > the softirq processing then the threaded processing should also have it. > Please tell me which one should be added and I'm happy to add one. In theory, the trace_rcu_utilization() should be added, just like at the beginning and end of the function rcu_core(), but as far as I know, no one uses that, so I actually have it on my list to remove. Thanx, Paul