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Wed, 18 Sep 2019 17:08:44 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3436B136059; Wed, 18 Sep 2019 17:08:44 +0000 (GMT) Received: from localhost (unknown [9.41.179.186]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 18 Sep 2019 17:08:44 +0000 (GMT) From: Nathan Lynch To: Gautham R Shenoy Subject: Re: [PATCH 0/2] pseries/hotplug: Change the default behaviour of cede_offline In-Reply-To: <20190918123039.GA12534@in.ibm.com> References: <1568284541-15169-1-git-send-email-ego@linux.vnet.ibm.com> <87impxr0am.fsf@linux.ibm.com> <20190915074217.GA943@in.ibm.com> <87a7b2rfj0.fsf@linux.ibm.com> <20190918123039.GA12534@in.ibm.com> Date: Wed, 18 Sep 2019 12:08:43 -0500 Message-ID: <874l19r0pw.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-09-18_09:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=998 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909180158 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tyrel Datwyler , "Aneesh Kumar K.V" , Kamalesh Babulal , linux-kernel@vger.kernel.org, Nicholas Piggin , "Naveen N . Rao" , Vaidyanathan Srinivasan , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Gautham R Shenoy writes: > The accounting problem in tools such as lparstat with > "cede_offline=on" is affecting customers who are using these tools for > capacity-planning. That problem needs a fix in the short-term, for > which Patch 1 changes the default behaviour of cede_offline from "on" > to "off". Since this patch would break the existing userspace tools > that use the CPU-Offline infrastructure to fold CPUs for saving power, > the sysfs interface allowing a runtime change of cede_offline_enabled > was provided to enable these userspace tools to cope with minimal > change. So we would be putting users in the position of choosing between folding and correct accounting. :-( Actually how does changing the offline mechanism to stop-self break the folding utility?