From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 12A50CDB46F for ; Tue, 23 Jun 2026 16:36:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D04496B0088; Tue, 23 Jun 2026 12:36:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C8E206B008A; Tue, 23 Jun 2026 12:36:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B7B886B008C; Tue, 23 Jun 2026 12:36:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 8AE4E6B0088 for ; Tue, 23 Jun 2026 12:36:35 -0400 (EDT) Received: from smtpin15.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay04.hostedemail.com (Postfix) with ESMTP id E291A1A04F3 for ; Tue, 23 Jun 2026 16:36:34 +0000 (UTC) X-FDA: 84911730708.15.3703C28 Received: from mail-qk1-f181.google.com (mail-qk1-f181.google.com [209.85.222.181]) by imf31.hostedemail.com (Postfix) with ESMTP id 54B6A20021 for ; Tue, 23 Jun 2026 16:36:25 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1782232585; b=yZoXrERgH08tmO2ZHI5+cO19MOYYN/FZCP4cMc25RQhMwphGvWz+rBOZJBCP4423K91mM7 hKMjTaDrP4JbcelZz8gWMrPI1e9kQm88GiwGcGnaqSWl6rd6yNL91EC3aBrKqiRNKC45mA mb1oX8p8ybdnMcK/rWaIM2G0yBuf3/w= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1782232585; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=dpQ1AwczYKCoguf7Vbwxx1q5Epc4lMpg8aH6LEWm7xE=; b=zAWSXXwNTNTYjxl4+XlJ03A/4TZHl+d7W2hr7XWGxNGYrUNX+NEIjtxdYBfBUTLRHj6Qxw meWBNaFHWXjrm6ihFs1GzRZYnyZYD4xNzflVJ1AmfKisfV951CG3MdZcjunvugwRs8pAIY v/HINs+Tp1jbqZl42X/XF3W+/femVCU= ARC-Authentication-Results: i=1; imf31.hostedemail.com; dkim=pass header.d=gourry.net header.s=google header.b=luoYW8Y8; spf=pass (imf31.hostedemail.com: domain of gourry@gourry.net designates 209.85.222.181 as permitted sender) smtp.mailfrom=gourry@gourry.net; dmarc=none Received: by mail-qk1-f181.google.com with SMTP id af79cd13be357-922e181f199so249631585a.3 for ; Tue, 23 Jun 2026 09:36:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gourry.net; s=google; t=1782232584; x=1782837384; darn=kvack.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=dpQ1AwczYKCoguf7Vbwxx1q5Epc4lMpg8aH6LEWm7xE=; b=luoYW8Y8zifQgb5YjMUVxZiuupl+Q53GY68Y6/a3g0McKC9ogDMgf1cicOeQ/9F7LW lS6dkb2yNRRzTKBktxByfFljY9m6zOrf4jyIU2XNrPFajLZYfyY1Y+PZbBUxKgDsRTrV 2nMsRFWbAcJ6wW3YOivZC8uQLmUjkJ/iuJbWI1xME2MPgiYInkKrOaeFizTzQ4bQI+No khrnZCKpgyTEUEdU4PKmQh2kqzqwB0r1S1oNGXItIjloG2npWDxokbNvD44ZvFAiI8Q+ tRvCb4KkNnpgQ0/V6uOU8+zVAbSLS60yxVsi10zjxu282HglpDUKfyeV2ZDlpem1qUQ/ Bqzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782232584; x=1782837384; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=dpQ1AwczYKCoguf7Vbwxx1q5Epc4lMpg8aH6LEWm7xE=; b=eNt7C5NGCIGRLObRS4a9cGu67zTyqiFJxjitYtXEHbk5u3hpeLtXAhgf6UnFw3NMAf E9vyZTqJYClj/qZChCEVo/QVV4dAXHrDM3cadmLXMZTDEKkUPUbZw5IClPqm5lHT+sIa goM7uEEc9IkIurwONq/DlQhNpVbKp3sREUZdqIpQv3QAsIiOTfa+I12zb6LoYCK8Tvxo tM+wGl1iQNOBGrNWHHHbxLJeA79x8UBZRTKhWqu0GcqjnMibklnOsoohO2M+FpWAPVer j+yhrDwqBuvg1zfh3MZOnA38os4sr7mGskf88Wvz4MWjeFQzd9dtyewAhF4Jyx5Z3XjR 00VQ== X-Gm-Message-State: AOJu0YwEflDJBltIJJxuMJ0smK1mS68dt7sa47cIDj8Ye1LijCkFKops 2y5L6IPrpy15s4aj+N9NdsrKQVYdjX1OI1Tme233FyD967rHVg6tSNp1yFVAFFFEOEo= X-Gm-Gg: AfdE7cnp7DcEP2HqHIgxwMQd8TnEmQMKfZtqocpujhbaDWJwkEgfs0O8bU9QN8YPwfm CeAG0QOYN8aTlA3hD2K1gPCwBTYMn1E1tP65oUHJz1lHgoX6mXOnL/UYfz5Uo9zXEDeYTobL0xh o8AaN+RQ/0h6itbhTii4g/Zx3rwq6Fbwo5KZMtFKUGDVBQh77GdyyIRUg+4RusQopG51cvzXlzZ 81joICVc99FnxQoIlxxL7Un4EkVGe8dh3e+HtNCiPvlFrtgCSM/HFNMCpJ/6x6e0XJiVhwT56iI nKPNyEH1pLkRPkH41iII7xXJwKa7spkEitlYyr7xhFOAW/iJxKHULFq0gLT4R1w0iCyk8bSLEhi pda/+Lvdxc+pFExjm0SMx2QEufme7ey3wDpgtZY9TCO9ot+5/A3ufi3FqoQXrLYDJ0zdge+dt/D xLK8i3v36MkJwpqMakZ+4c36vqX88lhPd0kUNYZTB3gljnm4cEogF4Jc+GJwcxeMG2Q32TD7BDW JEbkGw= X-Received: by 2002:a05:620a:6892:b0:926:a969:89d9 with SMTP id af79cd13be357-926a9698aaamr393123185a.7.1782232584382; Tue, 23 Jun 2026 09:36:24 -0700 (PDT) Received: from gourry-fedora-PF4VCD3F (pool-173-79-60-52.washdc.fios.verizon.net. [173.79.60.52]) by smtp.gmail.com with ESMTPSA id af79cd13be357-926000c2a09sm306953585a.31.2026.06.23.09.36.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Jun 2026 09:36:23 -0700 (PDT) Date: Tue, 23 Jun 2026 12:36:19 -0400 From: Gregory Price To: Mike Rapoport Cc: linux-mm@kvack.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, driver-core@lists.linux.dev, kernel-team@meta.com, corbet@lwn.net, skhan@linuxfoundation.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, rafael@kernel.org, lenb@kernel.org, gregkh@linuxfoundation.org, dakr@kernel.org, akpm@linux-foundation.org, rdunlap@infradead.org, feng.tang@linux.alibaba.com, dapeng1.mi@linux.intel.com, elver@google.com, kuba@kernel.org, ebiggers@kernel.org, lirongqing@baidu.com, paulmck@kernel.org, dave.jiang@intel.com, jic23@kernel.org, xueshuai@linux.alibaba.com, kai.huang@intel.com Subject: Re: [RFC PATCH 1/3] mm/numa: add exclusive node pool and numa=standby boot parameter Message-ID: References: <20260610014517.253609-1-gourry@gourry.net> <20260610014517.253609-2-gourry@gourry.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-HE-Tag: 1782232585-759617 X-HE-Meta: U2FsdGVkX1/YEDNrONz0rqFKgRw0ZnyRlH83rXl7Xgsrvxl3lFZhQ8boDCV63Z8+xNYWPrBHfCtqdmm23N3cAux8My8mEDDpZZC8iePawsblQz74j3hwtsxqbIbLo6+p920VryJVxCBUSKVnDrUZ23F2u5fWfOLoXekr0oFWWelYwPSvDYsc0Ufiw3b4gTmfLpyLzqd+UYhrdcLfx+HRGdnAxpmqb8WCe401gx+dl15811HrHLIoSFeUODIPTLsGnWk63dh9vu7JQQw6ZkhT/HsaANWOtjBzMvvrh4gRi8my9IyXC5CL+dNVuMMX79bhPfOkcxwyvNz0Of1f3uUE6sbcVDTIkCUFtfrMUfIS6MiMf71nL3ob5a17roqAvMh8+jKQu1QEES7z8YBjPc/Qqw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, Jun 14, 2026 at 12:08:31PM +0300, Mike Rapoport wrote: > On Thu, Jun 11, 2026 at 10:04:01AM -0400, Gregory Price wrote: > > On Thu, Jun 11, 2026 at 12:00:17PM +0300, Mike Rapoport wrote: > > > So really i think you're pointing out that futex_init() here probably > > shouldn't be using num_possible_nodes? > > I'd rather say that num_possible_nodes() with and without CXL (or other > differentiated memory) has different semantics. > Maybe we need to add a new primitive for possible differentiated nodes and > keep num_possible_nodes() to mean "number of possible nodes with normal > memory". > We'd have to define "normal" here a little more discretely. Normal = N_MEMORY at __init? Normal = N_MEMORY in the future? We also use the possible_nodes() mask to allocate per-node pgdat, so the futex example is largely just another "hey look at this thing, I wonder what other stuff is out there". ~Gregory