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Thu, 31 Oct 2019 17:14:32 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E22CA13604F; Thu, 31 Oct 2019 17:14:31 +0000 (GMT) Received: from localhost (unknown [9.85.136.151]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 31 Oct 2019 17:14:31 +0000 (GMT) From: Nathan Lynch To: Tyrel Datwyler Subject: Re: [RFC PATCH 1/9] powerpc/pseries: add cpu DLPAR support for drc-info property In-Reply-To: <9f7906d9-ef9b-4aa0-a5d6-428f19060919@linux.ibm.com> References: <1569910334-5972-1-git-send-email-tyreld@linux.ibm.com> <1569910334-5972-2-git-send-email-tyreld@linux.ibm.com> <871rvkjuoz.fsf@linux.ibm.com> <9f7906d9-ef9b-4aa0-a5d6-428f19060919@linux.ibm.com> Date: Thu, 31 Oct 2019 12:14:31 -0500 Message-ID: <87h83oltvs.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=2019-10-31_07:, , 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=8.0.1-1908290000 definitions=main-1910310169 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: bhelgaas@google.com, linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Tyrel Datwyler writes: > On 10/10/19 11:56 AM, Nathan Lynch wrote: >> As an aside I don't understand how the add_by_count()/dlpar_cpu_exists() >> algorithm could be correct as it currently stands. It seems to pick the >> first X indexes for which a corresponding cpu node is absent, but that >> set of indexes does not necessarily match the set that is available to >> configure. Something to address separately I suppose. > > I'm not sure I follow? Don't worry about it for this patchset, it's just something I noticed when reviewing. I'm wondering why the cpu add algorithm doesn't work more like the one for memory, which actually queries the platform for connector status via dlpar_acquire_drc(). It's possible I'm misunderstanding something though. Like I said, I think it's something to address separately if there is indeed an issue.