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Thu, 22 Aug 2019 18:33:13 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7AB15112062; Thu, 22 Aug 2019 18:33:13 +0000 (GMT) Received: from localhost (unknown [9.41.101.192]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 22 Aug 2019 18:33:13 +0000 (GMT) From: Nathan Lynch To: Srikar Dronamraju Subject: Re: [PATCH 2/3] powerpc/numa: Early request for home node associativity In-Reply-To: <20190822174005.GA31809@linux.vnet.ibm.com> References: <20190822144235.19398-1-srikar@linux.vnet.ibm.com> <20190822144235.19398-3-srikar@linux.vnet.ibm.com> <87ftltruf7.fsf@linux.ibm.com> <20190822174005.GA31809@linux.vnet.ibm.com> Date: Thu, 22 Aug 2019 13:33:13 -0500 Message-ID: <87d0gxrqxi.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=2019-08-22_11:, , 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908220160 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: linuxppc-dev@lists.ozlabs.org, Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Srikar Dronamraju writes: > * Nathan Lynch [2019-08-22 12:17:48]: >> > However home node associativity requires cpu's hwid which is set in >> > smp_setup_pacas. Hence call smp_setup_pacas before numa_setup_cpus. >> >> But this seems like it would negatively affect pacas' NUMA placements? >> >> Would it be less risky to figure out a way to do "early" VPHN hcalls >> before mem_topology_setup, getting the hwids from the cpu_to_phys_id >> array perhaps? >> > > Do you mean for calls from mem_topology_setup(), stuff we use cpu_to_phys_id > but for the calls from ppc_numa_cpu_prepare() we use the > get_hard_smp_processor_id()? Yes, something like that, I think. Although numa_setup_cpu() is used in both contexts.