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 41059C61DBD for ; Fri, 28 Aug 2026 04:21:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 2934B6B009E; Fri, 28 Aug 2026 00:21:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 243966B009F; Fri, 28 Aug 2026 00:21:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1823E6B00A0; Fri, 28 Aug 2026 00:21:02 -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 E564D6B009E for ; Fri, 28 Aug 2026 00:21:01 -0400 (EDT) Received: from smtpin11.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 19F6C14034F for ; Fri, 28 Aug 2026 04:21:01 +0000 (UTC) X-FDA: 85149377922.11.DE24E85 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf04.hostedemail.com (Postfix) with ESMTP id 5523740006 for ; Fri, 28 Aug 2026 04:20:59 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=zjLx3msp; dmarc=none; spf=pass (imf04.hostedemail.com: domain of akpm@linux-foundation.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1787890859; 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=Ms9ElGpndu/p4gAL+/SKqDdyKJI1gRddTa0Oo3jugRg=; b=Tm/rVPlAKunxw5iBlgFIBGUN6/L7IsOj0+5Xzqhxwcq39cvf8WNQEmXC4vCpilZvsnSiK/ VrecWw4+1Mz1EJ0AdRBh1hOH/nEYqe7rEMWVtVoA8EJ5SY5GLJqlLWdEz5/6nMTC10SxeO BrW+Y/AwC9z26Jzx/J2WtDdMLXgX5KI= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=zjLx3msp; dmarc=none; spf=pass (imf04.hostedemail.com: domain of akpm@linux-foundation.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1787890859; b=a9yUQcGvG6+E2pPqbLDnCzrGNNNirmbt/tA3RzWDl5jIPIuzu7h2okT00zN7lsMCUpCfq7 jtN8xUg4rlbiW7IIhQAUa9MMhaSfy0VlU2WdeFnpZAhk5fp39PRrEMpzRHh4yme51R1Lbp b88+iZqkzXT8TrdV1fW0V6N7Qlqnclo= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 717874074C; Fri, 28 Aug 2026 04:20:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E14971F000E9; Fri, 28 Aug 2026 04:20:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1787890858; bh=Ms9ElGpndu/p4gAL+/SKqDdyKJI1gRddTa0Oo3jugRg=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=zjLx3mspMsqvC1HC1b68Q2TAPPBiegAYK1vMXjHWbHsBl6g/VajdsK5FR+eAyvi1F h9ITZW4jAjHz3Jf/1OaOPRdXpT2i0FRvzG+vdptj0x7fqAtE3Fd9WftVeStw48HUK7 y785cuFytGJWnBqFNF+dHyeUqtyv5WtSX/XEmMzQ= Date: Thu, 27 Aug 2026 21:20:57 -0700 From: Andrew Morton To: Muchun Song Cc: Oscar Salvador , David Hildenbrand , Mike Rapoport , Vlastimil Babka , Lorenzo Stoakes , Michal Hocko , David Laight , "Liam R . Howlett" , Suren Baghdasaryan , Qi Zheng , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Muchun Song Subject: Re: [PATCH v5 00/17] mm: Introduce section-based vmemmap optimization for HugeTLB Message-Id: <20260827212057.37cf374d95450d325e5fce63@linux-foundation.org> In-Reply-To: <20260825084608.47437-1-songmuchun@bytedance.com> References: <20260825084608.47437-1-songmuchun@bytedance.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 5523740006 X-Stat-Signature: nudsxwcxzezonshdi4xas8uadiqsn69x X-Rspam-User: X-HE-Tag: 1787890859-510802 X-HE-Meta: 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 53MR1mMD OLzqnmp1dxZ4YB9v4qrhLjtHuJnMkEYQE32tsefGhhzwDae7OoHt0fFtV4gEzUDMWIOvvqQyrpjWmYWVxzfB0mTsa/YwWEfwrCScooPotOCCeXuGQr4JN+UkdtvQYxoMV0fWYpcqn/5mrQY5QYHkTuQujDs86qp6Was6f+Iv2F8EEjkJr60+c62RCyzU/BMz/3/WiBgWFCKL+vF6Z7mUVfbxCdLavESc2SA2KUcqW6mQOSphUGYVgwrrU2LwQOARtINcCXCDRWgVnhnvDTO55NcfsSH+dgnRPUTaswZ8644JKKzRU4oPK3Wjl5P5+R3+z41tmAd/v8bBmf2rHtnRneKOYnll+aLyVHzsI Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 25 Aug 2026 16:45:51 +0800 Muchun Song wrote: > HugeTLB vmemmap optimization currently has its own early boot setup > path. It pre-populates optimized vmemmap mappings before the normal > sparse-vmemmap population code runs, and sparsemem carries > SPARSEMEM_VMEMMAP_PREINIT only to support that special case. > > That makes the HugeTLB vmemmap optimization path harder to share with > other users of sparse-vmemmap optimization and leaves a fair amount of > HugeTLB-specific boot-time state in the generic memory initialization > flow. > > This series introduces section-based vmemmap optimization support in > the sparse-vmemmap code and switches HugeTLB bootmem pages over to it. > Instead of having HugeTLB pre-populate optimized vmemmap mappings > itself, HugeTLB now records the compound page order in the corresponding > memory sections. The generic sparse-vmemmap population path can then > allocate or reuse shared tail vmemmap pages based on section metadata. Thanks, I've added this to mm.git's mm-new branch. After -rc1 I'll move it into the mm-unstable branch, and thereby into linux-next.