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Fri, 22 Apr 2022 19:55:35 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E157411C052; Fri, 22 Apr 2022 19:55:34 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A4CBA11C050; Fri, 22 Apr 2022 19:55:31 +0000 (GMT) Received: from li-6e1fa1cc-351b-11b2-a85c-b897023bb5f3.ibm.com.com (unknown [9.43.112.230]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 22 Apr 2022 19:55:31 +0000 (GMT) From: Jagdish Gediya To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org Cc: baolin.wang@linux.alibaba.com, dave.hansen@linux.intel.com, ying.huang@intel.com, aneesh.kumar@linux.ibm.com, shy828301@gmail.com, weixugc@google.com, gthelen@google.com, dan.j.williams@intel.com, Jagdish Gediya Subject: [PATCH v3 2/7] mm: demotion: Add new node state N_DEMOTION_TARGETS Date: Sat, 23 Apr 2022 01:25:11 +0530 Message-Id: <20220422195516.10769-3-jvgediya@linux.ibm.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220422195516.10769-1-jvgediya@linux.ibm.com> References: <20220422195516.10769-1-jvgediya@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: aRlckp_abbNY4VUdskj5kbYr-iDtmzuD X-Proofpoint-GUID: IKNXG7uKtK-7dawYm7TAlnVKvtqeozOA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-04-22_06,2022-04-22_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=780 spamscore=0 priorityscore=1501 malwarescore=0 bulkscore=0 phishscore=0 suspectscore=0 adultscore=0 clxscore=1015 mlxscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2204220083 X-Rspamd-Queue-Id: AC1EF40031 X-Stat-Signature: p1nooxyu5ezgm95cr59hfzr7684n1jx7 Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=c927QxCg; dmarc=pass (policy=none) header.from=ibm.com; spf=pass (imf01.hostedemail.com: domain of jvgediya@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=jvgediya@linux.ibm.com X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1650657340-117372 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: Some systems(e.g. PowerVM) have DRAM(fast memory) only NUMA node which are N_MEMORY as well as slow memory(persistent memory) only NUMA node which are also N_MEMORY. As the current demotion target finding algorithm works based on N_MEMORY and best distance, it can choose DRAM only NUMA node as demotion target instead of persistent memory node on such systems. If DRAM only NUMA node is filled with demoted pages then at some point new allocations can start falling to persistent memory, so basically cold pages are in fast memory (due to demotion) and new pages are in slow memory, this is why persistent memory nodes should be utilized for demotion and dram node should be avoided for demotion so that they can be used for new allocations. Add new state N_DEMOTION_TARGETS, node_states[N_DEMOTION_TARGETS] then can be used to hold the list of nodes which can be used as demotion targets, later patches in the series builds demotion targets based on nodes available in node_states[N_DEMOTION_TARGETS]. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Jagdish Gediya --- drivers/base/node.c | 4 ++++ include/linux/nodemask.h | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/base/node.c b/drivers/base/node.c index ec8bb24a5a22..6eef22e6413e 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -1038,6 +1038,9 @@ static struct node_attr node_state_attr[] = { [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), [N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator, N_GENERIC_INITIATOR), + [N_DEMOTION_TARGETS] = _NODE_ATTR(demotion_targets, + N_DEMOTION_TARGETS), + }; static struct attribute *node_state_attrs[] = { @@ -1050,6 +1053,7 @@ static struct attribute *node_state_attrs[] = { &node_state_attr[N_MEMORY].attr.attr, &node_state_attr[N_CPU].attr.attr, &node_state_attr[N_GENERIC_INITIATOR].attr.attr, + &node_state_attr[N_DEMOTION_TARGETS].attr.attr, NULL }; diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h index 567c3ddba2c4..17844300fd57 100644 --- a/include/linux/nodemask.h +++ b/include/linux/nodemask.h @@ -400,6 +400,7 @@ enum node_states { N_MEMORY, /* The node has memory(regular, high, movable) */ N_CPU, /* The node has one or more cpus */ N_GENERIC_INITIATOR, /* The node has one or more Generic Initiators */ + N_DEMOTION_TARGETS, /* Nodes that should be considered as demotion targets */ NR_NODE_STATES }; -- 2.35.1