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Tue, 21 Jul 2020 02:57:34 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0D1A7A405B; Tue, 21 Jul 2020 02:57:33 +0000 (GMT) Received: from linux.vnet.ibm.com (unknown [9.126.150.29]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with SMTP; Tue, 21 Jul 2020 02:57:32 +0000 (GMT) Date: Tue, 21 Jul 2020 08:27:32 +0530 From: Srikar Dronamraju To: Michael Ellerman Subject: Re: [PATCH 07/11] Powerpc/numa: Detect support for coregroup Message-ID: <20200721025732.GI21103@linux.vnet.ibm.com> References: <20200714043624.5648-1-srikar@linux.vnet.ibm.com> <20200714043624.5648-8-srikar@linux.vnet.ibm.com> <875zaithmk.fsf@mpe.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <875zaithmk.fsf@mpe.ellerman.id.au> User-Agent: Mutt/1.10.1 (2018-07-13) X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-07-20_09:2020-07-20, 2020-07-20 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxlogscore=999 spamscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 phishscore=0 adultscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007210016 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: Srikar Dronamraju Cc: Nathan Lynch , Gautham R Shenoy , Oliver OHalloran , Michael Neuling , Anton Blanchard , linuxppc-dev , Nick Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" * Michael Ellerman [2020-07-20 23:56:19]: > Srikar Dronamraju writes: > > > Add support for grouping cores based on the device-tree classification. > > - The last domain in the associativity domains always refers to the > > core. > > - If primary reference domain happens to be the penultimate domain in > > the associativity domains device-tree property, then there are no > > coregroups. However if its not a penultimate domain, then there are > > coregroups. There can be more than one coregroup. For now we would be > > interested in the last or the smallest coregroups. > > Should I know what a "coregroup" is? It's not a term I'm familiar with. > Coregroup is a group or subset of cores from the same chip/DIE that share some resources. This is very similar to MC domain aka Multi-Core Cache (MC), (kernel/sched/topology.c) where cores share the same cache. In the Multi-Core Cache domain, all the cores of that domain share the last level of cache. Will add the description to the commit message. > When you repost can you expand the Cc list to include lkml and > scheduler/topology folks please. > Okay, will add them, I shall copy to LKML, Peter Zijlstra and Ingo Molnar. Do let me know if you want anyone else to added. > cheers -- Thanks and Regards Srikar Dronamraju