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Tue, 29 Oct 2019 11:13:19 +0000 Received: from b01ledav001.gho.pok.ibm.com (b01ledav001.gho.pok.ibm.com [9.57.199.106]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x9TBDInd52560190 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 29 Oct 2019 11:13:18 GMT Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C84842805A; Tue, 29 Oct 2019 11:13:18 +0000 (GMT) Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7428D28059; Tue, 29 Oct 2019 11:13:18 +0000 (GMT) Received: from sofia.ibm.com (unknown [9.199.37.192]) by b01ledav001.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 29 Oct 2019 11:13:18 +0000 (GMT) Received: by sofia.ibm.com (Postfix, from userid 1000) id A873D2E3143; Tue, 29 Oct 2019 16:43:14 +0530 (IST) Date: Tue, 29 Oct 2019 16:43:14 +0530 From: Gautham R Shenoy To: Nathan Lynch Subject: Re: [PATCH v2 0/1] pseries/hotplug: Change the default behaviour of cede_offline Message-ID: <20191029111314.GC12266@in.ibm.com> References: <1571740391-3251-1-git-send-email-ego@linux.vnet.ibm.com> <87o8y45sxt.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87o8y45sxt.fsf@linux.ibm.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-10-29_03:, , 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=901 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910290114 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: , Reply-To: ego@linux.vnet.ibm.com Cc: Tyrel Datwyler , "Gautham R. Shenoy" , Kamalesh Babulal , linux-kernel@vger.kernel.org, Nicholas Piggin , "Aneesh Kumar K.V" , "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" Hello Nathan, On Fri, Oct 25, 2019 at 06:03:26PM -0500, Nathan Lynch wrote: > "Gautham R. Shenoy" writes: > > This is the v2 of the fix to change the default behaviour of > > cede_offline. > > OK, but why keep the cede offline behavior at all? Can we remove it? I > think doing so would allow us to remove all the code that temporarily > onlines threads for partition migration. May be I am missing something. But don't we want all the CPUs to come online and execute the H_JOIN hcall before performing partition migration? How will this change whether the offlined CPUs are in H_CEDE or rtas-stop-self? -- Thanks and Regards gautham.