From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-174.mta1.migadu.com (out-174.mta1.migadu.com [95.215.58.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D0D601448D5 for ; Thu, 14 May 2026 02:38:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.174 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778726295; cv=none; b=mTvBNJQhH0qAH1fJhWPSEsvNyf22U3b0noXIWxIlO8aYsmbzl0QtVV/bhCLThuNH+0j702rNxN2BV8V2+a2phi5lt9WsJdG0SxuExiCdcKhXgvD8Zp+fSWazl5eA7xxH5Sz1Gw6zGWhQGsRZOnerfG4n9eAyEc7WyKpJJF1PgwI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778726295; c=relaxed/simple; bh=8mMFd2ZuPeB5whmvIjvKFCtK7Zo6oHHV9ZAT05XKL+g=; h=Content-Type:Mime-Version:Subject:From:In-Reply-To:Date:Cc: Message-Id:References:To; b=PyPIYqILZMS2633Fr965kKhAXGc9lOUMtWmR1iYNQCh2PW9CHc7yJ5vYEO+ZXaIQ2eR2cKrCSk9U+uxs5/b/k+Ev5b81KobV2OeDzcDN+gutqWaKdupzN0FM7RrFeOiZ9qEn9Nrx1rjDGEZ5YtDeo8Rv+a/tX9uWhLJ8b85iAB0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=YJ8Tnuzx; arc=none smtp.client-ip=95.215.58.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="YJ8Tnuzx" Content-Type: text/plain; charset=us-ascii DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1778726291; h=from:from: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; bh=8mMFd2ZuPeB5whmvIjvKFCtK7Zo6oHHV9ZAT05XKL+g=; b=YJ8TnuzxHEEH6IGA816hfhYy2ZuUWTHbBFnfRTdtiCoL2PJPGBTdMLmLT8GaRMx02Xg+qZ te5f6Nmt3sPS6YWm2KBMMpFXE0NIapbu4pT7jl9Ixrk9Ly+k8DbJyT6zRyGENmh2GdbFc0 MqH0D+Ve2tIwNA+2eTcykwWQdcbdS3c= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3864.500.181\)) Subject: Re: [PATCH v2 00/69] mm: Generalize HVO for HugeTLB and device DAX X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Muchun Song In-Reply-To: Date: Thu, 14 May 2026 10:37:28 +0800 Cc: Andrew Morton , Muchun Song , David Hildenbrand , Michael Ellerman , Madhavan Srinivasan , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Nicholas Piggin , Christophe Leroy , Ackerley Tng , Frank van der Linden , aneesh.kumar@linux.ibm.com, joao.m.martins@oracle.com, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <20260513130542.35604-1-songmuchun@bytedance.com> <20260513104640.b0f02b844c57f92bc954878e@linux-foundation.org> To: Oscar Salvador X-Migadu-Flow: FLOW_OUT > On May 14, 2026, at 02:26, Oscar Salvador wrote: >=20 > On Wed, May 13, 2026 at 10:46:40AM -0700, Andrew Morton wrote: >> On Wed, 13 May 2026 21:04:28 +0800 Muchun Song = wrote: >>=20 >>> In this series, HVO is redefined as Hugepage Vmemmap Optimization: a >>> general vmemmap optimization model for large hugepage-backed = mappings, >>> rather than a HugeTLB-only implementation detail. >>>=20 >>> The existing code grew around the original HugeTLB-specific HVO = path, >>> while device DAX developed similar but separate vmemmap optimization >>> handling. As a result, the current implementation carries duplicated >>> logic, boot-time special cases, and subsystem-specific interfaces = around >>> what is fundamentally the same sparse-vmemmap optimization. >>>=20 >>> This series generalizes that optimization into a common framework = used >>> by both HugeTLB and device DAX. >>>=20 >>> The first few patches include some minor bug fixes found during = AI-aided >>> review of the current code. These fixes are not the main goal of the >>> series, but the later refactoring and unification work depends on = them, >>> so they are included here as preparatory changes. >>>=20 >>> The series then reworks the relevant early boot and sparse >>> initialization paths, introduces a generic section-based = sparse-vmemmap >>> optimization infrastructure, switches HugeTLB and device DAX over to = the >>> shared implementation, and removes the old special-case code. >>>=20 >>> ... >>>=20 >>> 46 files changed, 743 insertions(+), 1812 deletions(-) >>=20 >> Gulp. >>=20 >> I think the first 15ish patches (little fixes and cleanups and >> refactorings) are ready to go in immediately? >=20 > I plan to have a (partial ) look at this tomorrow/Friday, but = splitting Thanks. > this series in fixes-that-can-go-straight-away and the feature itself = would make more > sense and help ease the review. Yes. > Head tends to spin a bit when the patchset grows beyond certain number = of patches :-D. >=20 > Would that be possible Munchun? I'd prefer to group the first 19 patches into a single series (titled "Refactor bootmem gigantic hugepage allocation"). Therefore, waiting for your review. :) Once patches 13-19 pass review, I will send them out as a standalone series. Muchun, Thanks. >=20 >=20 >=20 > --=20 > Oscar Salvador > SUSE Labs