From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.subspace.kernel.org (Postfix) with ESMTP id DBA43606A31F for ; Mon, 19 Oct 2026 19:05:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256 header.s=selector2 header.b=poMulWY5 Received: by kanga.kvack.org (Postfix) id 05B0E6B034B; Mon, 19 Oct 2026 15:05:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 034516B034C; Mon, 19 Oct 2026 15:04:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E64E96B034D; Mon, 19 Oct 2026 15:04:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id C0D4A6B034B for ; Mon, 19 Oct 2026 15:04:59 -0400 (EDT) Received: from smtpin16.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 62E30140747 for ; Mon, 19 Oct 2026 19:04:59 +0000 (UTC) X-FDA: 85340303118.16.3E4F7BF Received: from SN4PR0501CU005.outbound.protection.outlook.com (mail-southcentralusazon11011020.outbound.protection.outlook.com [40.93.194.20]) by imf16.hostedemail.com (Postfix) with ESMTP id 73710180004 for ; Mon, 19 Oct 2026 19:04:56 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=poMulWY5; spf=pass (imf16.hostedemail.com: domain of ziy@nvidia.com designates 40.93.194.20 as permitted sender) smtp.mailfrom=ziy@nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); dmarc=pass (policy=reject) header.from=nvidia.com ARC-Seal: i=2; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=pass; t=1792436696; b=VHoV3uz2il88sqSi3cFmbBgGJf7v0bzITPeTqLgXIiWS8pQByvahH84koogaFJzoT44ZCd RL75WG3SAqwCwxHsfyD2zJZNdPbn67TlXdAhOoixUOc80JpgXo4fyQdIk2LWET1fnol/R1 28pyly0fOtcE9Hap0D8PNy7eTwFcR7k= ARC-Authentication-Results: i=2; imf16.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=poMulWY5; spf=pass (imf16.hostedemail.com: domain of ziy@nvidia.com designates 40.93.194.20 as permitted sender) smtp.mailfrom=ziy@nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); dmarc=pass (policy=reject) header.from=nvidia.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1792436696; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=OwXkYju8Q6RlcwZxR6BWht000Jd6fsJD01BPXoy4dqQ=; b=469hgeyP3lQytnLVD0vX+AxlvwCncJFWbDbAsarWc87eTf7hZudWTqfl66jlv63mkj9hrh I0wOQe3vYZV6b5LuVlLDYBRhuvt64EqiubrxrQjdc/seFHOyNBYiO48V8OyETykEzJRYLv dLq+WxxZyQkTMxSJHDP9UTtebkisAh0= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Quki4Pm/YOkNehuQnX19D1guCzjsXuIxs610kQXmro8JDecGTT5oUreB8qAtHgbZ4IZGeShQVtsAFO4N/pfmYHWW5q6PIE96cY5sMSSDr6mnpu0iYBJm7IjqHMQ/6iA0DGMp+/jVPVT7HVCMw0M+kKynPcuMGQvDW5cVkY4LnwMKkE46wMybO1JfOl9ulsZFvIMWvj99/kxmLFgVBbHQ81UNieTG2xCKxZPGwzFTo7cE/wqtYNrRhC2bRJsYtkDDdnjL/KBVcM4i3TiVWQvMgEKAm3LusJS/2Vl+MIiNT08u0IWr2SHl9e0qjpZH+9treiLJOUHfC8pYEk2k8SnX9A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=OwXkYju8Q6RlcwZxR6BWht000Jd6fsJD01BPXoy4dqQ=; b=DxH7Nvv921GaDyjCHn1lUTeWolUdqDxMgaTTvuYqq7NW5SgzfdBSL1BaMrQLUAP8UlCSh8ICfcb2vX+xQxToO/2I5dHlVN/hc9SlgcC7pSCfbcfT5dVk9u/Kc5kaTiF190JwKxMHgtzVq8L0Hq0SJZFHOva2eM4FOaiZCAMAdwamgu4wfVIZJIvIkzRPoSF4HQJxuU4O9aMua8PfMsLPyra4P1wzYNbTo+jkw9tsa2dLnl0VtWrfyVLSVCm9V5ub+O0kK2zA5PYAuJgSgR9+GrdyCmNJ+q8xznH0SLLYgutO3TDdiUvu0ktRqj1Mv/8EsxaAPbpTD4qia4mY0Ku5vg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=OwXkYju8Q6RlcwZxR6BWht000Jd6fsJD01BPXoy4dqQ=; b=poMulWY5fEGJrY0y0o/Yt79h0ISl2ly0Kr16G3LnUtWrk7jOrORMrs7IIgDPW1oppzLzBuQrOzO9HPJNsDKM1Rog8aWymrnkfVvdhFHf+FLg3EMmudx3g7rI5t0tNJGMnWaAFIuRMxw8oYBd56dZH3Dm31Ga+xvcRLuFojbX4ot+lONn/AbeyIbcVL21qqT/u6LIvAiISDTLK1hIkkHIQADhZ0BE84Iy3yDu0y9C/F3z3JbCT83/IMBOx3NtIQAHZEkBVNjII7xAy7HIotL4Lcua738LxldzoYYV4frza3kLtbiMngWNksmLWYwF4mBL6rnMHsyzA6a5U5zcIuxzwQ== Received: from IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) by CH1PPFF9270C127.namprd12.prod.outlook.com (2603:10b6:61f:fc00::62b) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.522.19; Mon, 19 Oct 2026 19:04:46 +0000 Received: from IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16]) by IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16%6]) with mapi id 15.21.0522.017; Mon, 19 Oct 2026 19:04:46 +0000 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 19 Oct 2026 15:04:45 -0400 Message-Id: To: "Gregory Price (Meta)" , From: "Zi Yan" Subject: Re: [PATCH] mm/memory-tiers: reset demotion targets of nodes without memory Cc: , , , , , , , , X-Mailer: aerc 0.22.0 References: <20261019184712.3422641-1-gourry@gourry.net> In-Reply-To: <20261019184712.3422641-1-gourry@gourry.net> X-ClientProxiedBy: BLAP220CA0030.NAMP220.PROD.OUTLOOK.COM (2603:10b6:208:32c::35) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) X-Archived-By: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|CH1PPFF9270C127:EE_ X-MS-Office365-Filtering-Correlation-Id: 283a8e5e-87b2-4bb5-a1a5-08df2e13d77f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|23010399003|1800799024|7416014|22082099003|18002099003|10067099003|261009223027099003|11063799006|56012099006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:IA0PR12MB8374.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(376014)(23010399003)(1800799024)(7416014)(22082099003)(18002099003)(10067099003)(261009223027099003)(11063799006)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?blBzOS9rZEhZWmp5RFhaSjlHQ25LNCsxTWlMb2lwZ1hUSGt0dWR0YSs1K1N5?= =?utf-8?B?NDNTemsrR3hLS0l3dkRoNS9OL2RvOXlrU0FmL0d6all6bVE2Kytyd2dySnNV?= =?utf-8?B?T2hRUUpSYmN0dEZwZTdsdkw5cUp2TVlNRTFBbEhOWldkTWZrNVpzNnV3Y2hH?= =?utf-8?B?V0JjWXlZT0RoUTBOaSs1b20yakZNUHVVMzhQQkd0L1dTb1hZejFSaFEyTEhx?= =?utf-8?B?bVoxWGtJRWFON3ZQZUV1RGdhbnp6UEJCZi9IdDBCTFQ0SllnRnVOK2kwdi9S?= =?utf-8?B?OHpmTmZMMlRwOXVOT1VVazhMdGgyRUVZa0ZvKzhrQ3BPbkJtYVFFeHM4MW9H?= =?utf-8?B?NDNxZStOR051b3VvaWx5ZjErWXRqYkdCa2FZblp1eS9nZ3pKa3VqTkIzallP?= =?utf-8?B?TC9hZlpGdHM5bFRDcmpZYWY5RXZvMVZ1Z0lYaDZpYkVSMnNMQU9VbmZKc2Zx?= =?utf-8?B?SHE5WGpTVHVGSVBPcjBCMXB5UDFpVjJMUWcyMndSMnQ4anV2WVJEdDdYSm5t?= =?utf-8?B?M1NlS1BGSHBMR3drdHQ4WC9NOHRKVDAyQTBwRWZ5RjlyK01jODFqcEFlRDdW?= =?utf-8?B?MCswY0dINmt4a2YrQVB6SW1pcmhHZzdNYWVSYWVMTmRDcTdQbFFMenNtSGFO?= =?utf-8?B?eWJpQktzR3IwS0xBSnR6cXkyN3FUQ1pNeVk1d1ZrQTE3V3JRU2ZGbVdwMWxl?= =?utf-8?B?OGUrZG5aOVZvSldZS0JmMDlBNk90RDg2NldwWnZacEhIMzJhSllMclRFWWJ0?= =?utf-8?B?cXVhbUdOa1dtOCtyZmxJZUFpcHI4aGxtZy8rUlNOeWtycTlVVmRHb2VnaVNv?= =?utf-8?B?Zmk5Wk1pMkd3OUJEZW5yandHeXRWbThjS0loKzlzeGJqUm02dXh6WDRSenh3?= =?utf-8?B?Yyt6aXZoNXVrMzBKM290NHpiVURiRW4zQVBUak5Ua3NZUm5veVFHOEE3b3pE?= =?utf-8?B?ekZ3dWVWUkR3d0hoYk92UHEyL3pSN3dGbzVjaG93K1JXSy9zYkt1cUpYbCtD?= =?utf-8?B?QndodWZUbm9CNGJ5WlRzZFRLTk1HU2k2Qys4V0lxU2NEWi9LL3YrSkpSdUxm?= =?utf-8?B?bzBMSGVmcFVlc0tFWDcyRGNwZlRac21aU2pZZnNpaTZNR2k2OVhPOGNNK0Va?= =?utf-8?B?Z3VQU2RlYU5weVF6MFFDWmxLLzVONnBKcStKV2NBcHlZdTUxS0Rld3VsUFNh?= =?utf-8?B?M29jSHZsZ3BJOEpKQ1pqYXFqYXpoMXhjSnRSenRWQUNiYkVSQ0F6d0d5Ull4?= =?utf-8?B?L2U1VVFrKzIyOFRsL25acncyTklBQzlrOGhHS0lSNmc5OEJkWnJSSWxpWW1x?= =?utf-8?B?cGEycnh1UTkrQVdTTVZkYno0aThmZENROXVIQkVsbXhXaWNEWnNBUVR3VVNs?= =?utf-8?B?TjhHVTZwNnRleXJlS0NGSllKdWpnSCtMOUtqd1F4T2VYYVpIcXBwRXNoVFBD?= =?utf-8?B?ZEFTZVpHKzhkZkJReU80SitVTnhmOXBGN0lGWTdFS0Uxcy9YMFJKOGdKUzZW?= =?utf-8?B?NGsxM3VxY2Z0Nm52V3psSjRManYrN0UrR0E2bytnaVFjODI0RXpDZkdtRG1n?= =?utf-8?B?dnV6NjJKeTRlK3Jwbm1yQU4zajdDNUZBbGVyMGc0RWtnOXVUQmlSSHZrV2V6?= =?utf-8?B?K3NiWHlXNUovdXQ4cEluT09GU3lXRmVtOUREQ0FocnhRVWhubDJ3bFVCVXhS?= =?utf-8?B?dlpOcWg3NkZRNHQwb01zcTJwNEEveTNIZit0Zm1PN3ZtSm41SnJvSjVGdno3?= =?utf-8?B?S0FBVnZRM2V6ZWl1NnlrTVhDWS9jbnJTWXNwNWZIZEJtU2E0Q1VKRllyZFd6?= =?utf-8?B?bnBPZUNkS3U5QXJ3TVIvNnFUR2dscmZHRjZCbXg0ZHZQMGxnbjZrL29SQ21Q?= =?utf-8?B?bDZaUUNydzMvcTUwaWVGbHBmTHBqSGE2Z2xtZDAySXNWaERtMHQ3S3Z1ak01?= =?utf-8?B?UHl0T2dXRWFVeDFUeFBuN1lOYWNQVW5ha0x3TzVmOXFYeWRrMnFubnlQNk9S?= =?utf-8?B?WVhETS8vYkpja09uWDFTRGNZVHJQRHJrelovVTlsdVZJdXc3cXBLSTRmN3ZZ?= =?utf-8?B?TWVUUzQ3YWE1cmxCM3FmOEQvWiswb1BRZVo4Mjk3VTFqRmE2bkxLWURiTnQ4?= =?utf-8?B?VmpXbzBoTlE2L2pZcnhnRlRmeFRORHdoR0s3TmVZeUpLQjM0RWJKQzJoeU1P?= =?utf-8?B?aU9QdWpqUE1sb0ZBQXhJdFFTK1g5d2M1aXJvRGVuQ2Y3VzdXdlVQS0N6eFNR?= =?utf-8?B?cHNORGNhQ2J2aHlrSmQ1Y3NySEpuMnlrR1lKWVpHTlFOUy9GOVR2L3cvUlJm?= =?utf-8?Q?5yuoHU5ufxo/Vsk5E0?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 283a8e5e-87b2-4bb5-a1a5-08df2e13d77f X-MS-Exchange-CrossTenant-AuthSource: IA0PR12MB8374.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Oct 2026 19:04:46.6382 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: aZfMHTX/vJ9dwHINNjbE46Aeq4rQ0K4X9G1Rxxp5Em3mO4aTJlMTXfc/gwg1uMIL X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH1PPFF9270C127 X-Rspam-User: X-Rspamd-Queue-Id: 73710180004 X-Stat-Signature: ns4re4pagcnp17mz9qzykx36fqktsnzy X-Rspamd-Server: rspam01 X-Spam-Status: No, score=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1792436696-320845 X-HE-Meta: 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 UV/uqtkE 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Mon Oct 19, 2026 at 2:47 PM EDT, Gregory Price (Meta) wrote: > When a node loses its last memory, offline_pages() clears N_MEMORY > before the memory-tier callback rebuilds the demotion targets. > disable_all_demotion_targets() resets only N_MEMORY nodes, so the node > keeps its old node_demotion[] entry while it has no memory. Before > 6c542ab75714, the reset covered every online node. establish_demotion_targets() uses for_each_node_state(node, N_MEMORY), because the to-be-online node is already added into N_MEMORY? > > A reclaimer reads the stale entry only between the node regaining memory > and its targets being rebuilt, and it filters the entry against the > current allowed targets, so there is no user-visible effect. To see it, > online and then offline a node's only DIMM: a debugger still finds the > lower-tier node in node_demotion[nid].preferred. > > Reset the targets of every node. > > Fixes: 6c542ab75714 ("mm/demotion: build demotion targets based on explic= it memory tiers") > Signed-off-by: Gregory Price (Meta) > --- > mm/memory-tiers.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c > index 25e121851b586..7197f1a67a340 100644 > --- a/mm/memory-tiers.c > +++ b/mm/memory-tiers.c > @@ -378,7 +378,7 @@ static void disable_all_demotion_targets(void) > struct memory_tier *memtier; > int node; > =20 > - for_each_node_state(node, N_MEMORY) { > + for_each_node(node) { I think the above code deserves a comment explaining why for_each_node() is needed instead of for_each_node_state(N_MEMORY), because when a node is added or removed during memory hotadd or hotremove matters here. > node_demotion[node].preferred =3D NODE_MASK_NONE; > /* > * We are holding memory_tier_lock, it is safe --=20 Best Regards, Yan, Zi