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Wed, 30 Mar 2022 13:51:47 +0000 (GMT) Received: from saptagiri.in.ibm.com (unknown [9.43.100.4]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 30 Mar 2022 13:51:46 +0000 (GMT) From: Srikar Dronamraju To: Michael Ellerman Cc: linuxppc-dev , Srikar Dronamraju , linux-mm@kvack.org, Michal Hocko , Geetika Moolchandani Subject: [PATCH] powerpc/numa: Handle partially initialized numa nodes Date: Wed, 30 Mar 2022 19:21:23 +0530 Message-Id: <20220330135123.1868197-1-srikar@linux.vnet.ibm.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: OPgegmOLR9akDNkqQgO8Lw_7cQSqboq8 X-Proofpoint-GUID: OPgegmOLR9akDNkqQgO8Lw_7cQSqboq8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.850,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-30_04,2022-03-30_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 mlxscore=0 adultscore=0 impostorscore=0 mlxlogscore=787 malwarescore=0 clxscore=1011 suspectscore=0 bulkscore=0 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2203300066 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 1132620003 X-Stat-Signature: i4qxfs3xsotec3srwdxg9y1ho1a8p83k Authentication-Results: imf31.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=f1WEaQcS; dmarc=pass (policy=none) header.from=ibm.com; spf=none (imf31.hostedemail.com: domain of srikar@linux.vnet.ibm.com has no SPF policy when checking 148.163.156.1) smtp.mailfrom=srikar@linux.vnet.ibm.com X-Rspam-User: X-HE-Tag: 1648648319-676415 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: With commit 09f49dca570a ("mm: handle uninitialized numa nodes gracefully") NODE_DATA for even a memoryless/cpuless node is partially initialized at boot time. Before onlining the node, current Powerpc code checks for NODE_DATA to be NULL. However since NODE_DATA is partially initialized, this check will end up always being false. This causes hotplugging a CPU to a memoryless/cpuless node to fail. Before adding CPUs $ numactl -H available: 1 nodes (4) node 4 cpus: 0 1 2 3 4 5 6 7 node 4 size: 97372 MB node 4 free: 95545 MB node distances: node 4 4: 10 $ lparstat System Configuration type=3DDedicated mode=3DCapped smt=3D8 lcpu=3D1 mem=3D99709440 kB cpus=3D= 0 ent=3D1.00 %user %sys %wait %idle physc %entc lbusy app vcsw phint ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- 2.66 2.67 0.16 94.51 0.00 0.00 5.33 0.00 67749 0 After hotplugging 32 cores $ numactl -H node 4 cpus: 0 1 2 3 4 5 6 7 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 node 4 size: 97372 MB node 4 free: 93636 MB node distances: node 4 4: 10 $ lparstat System Configuration type=3DDedicated mode=3DCapped smt=3D8 lcpu=3D33 mem=3D99709440 kB cpus=3D= 0 ent=3D33.00 %user %sys %wait %idle physc %entc lbusy app vcsw phint ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- 0.04 0.02 0.00 99.94 0.00 0.00 0.06 0.00 1128751 3 As we can see numactl is listing only 8 cores while lparstat is showing 33 cores. Also dmesg is showing messages like: [ 2261.318350 ] BUG: arch topology borken [ 2261.318357 ] the DIE domain not a subset of the NODE domain Fixes: 09f49dca570a ("mm: handle uninitialized numa nodes gracefully") Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-mm@kvack.org Cc: Michal Hocko Cc: Michael Ellerman Reported-by: Geetika Moolchandani Signed-off-by: Srikar Dronamraju --- arch/powerpc/mm/numa.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index b9b7fefbb64b..13022d734951 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -1436,7 +1436,7 @@ int find_and_online_cpu_nid(int cpu) if (new_nid < 0 || !node_possible(new_nid)) new_nid =3D first_online_node; =20 - if (NODE_DATA(new_nid) =3D=3D NULL) { + if (!node_online(new_nid)) { #ifdef CONFIG_MEMORY_HOTPLUG /* * Need to ensure that NODE_DATA is initialized for a node from --=20 2.27.0