From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) (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 E0D663570BE for ; Thu, 29 Jan 2026 02:52:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769655165; cv=none; b=UdMJHFgcFHNswZYDpqiX9ef5tuWn45lQ9Vy0RDqhlixO8m805JaquNCAYPpAZgqO82T+xR4CFDFqu25ylws2jogjyoMu/qt4ORVAgZ4mnCOKDgdTz0ufqgz/AOoWaSGHQVC6q26KQlLdybaEb21L1yF4DuIL0GsZ7SzbH9/GJSI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769655165; c=relaxed/simple; bh=mfj64IcwXKuAswN64BKy+GaRzOkqTPEFZRcVNE7fDg0=; h=Content-Type:Mime-Version:Subject:From:In-Reply-To:Date:Cc: Message-Id:References:To; b=QDe0ksMNdqdiJ++KazkGziIFOaDsOpD+QF/49IjoHP/rGLk4NDeWxoJ9ElMPpCwy8Tog3Zpn8juV1CnX4P8e3mnS5LXswQUs/C1nEUwSAk1dHsdHjWnSr58gSXdJm2fjZ2347A/NQLmsh1DYIybW4i/dx8tAr+FZT0PincRGQLY= 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=Zsd8oPGy; arc=none smtp.client-ip=95.215.58.177 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="Zsd8oPGy" Content-Type: text/plain; charset=us-ascii DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1769655155; 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=zUUCdyLNfxqZr/JB01jIM2hS9AGiun290KshO5xiDNo=; b=Zsd8oPGyu5Uk7qrMcCaR8as8UdOPm0CloBX4g8v2jaMMG87yYzKAcVcuJedg4e4kWo99Sa NPGVL+lCQu5BYDf4/XNR/VoyJqvKO5RNqOfvzWLYF1jd7rZlr/qOld56WiPELa5NB9KUBH hkDYJGOnOocrlW7Cn5jC7PQp16cezk4= 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 \(3864.300.41.1.7\)) Subject: Re: [PATCHv5 10/17] mm/hugetlb: Refactor code around vmemmap_walk X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Muchun Song In-Reply-To: <20260128135500.22121-11-kas@kernel.org> Date: Thu, 29 Jan 2026 10:51:48 +0800 Cc: Andrew Morton , David Hildenbrand , Matthew Wilcox , Usama Arif , Frank van der Linden , Oscar Salvador , Mike Rapoport , Vlastimil Babka , Lorenzo Stoakes , Zi Yan , Baoquan He , Michal Hocko , Johannes Weiner , Jonathan Corbet , Huacai Chen , WANG Xuerui , Palmer Dabbelt , Paul Walmsley , Albert Ou , Alexandre Ghiti , kernel-team@meta.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org Content-Transfer-Encoding: 7bit Message-Id: <1E5F65B7-59C0-463D-95EA-808520C14B85@linux.dev> References: <20260128135500.22121-1-kas@kernel.org> <20260128135500.22121-11-kas@kernel.org> To: Kiryl Shutsemau X-Migadu-Flow: FLOW_OUT > On Jan 28, 2026, at 21:54, Kiryl Shutsemau wrote: > > To prepare for removing fake head pages, the vmemmap_walk code is being > reworked. > > The reuse_page and reuse_addr variables are being eliminated. There will > no longer be an expectation regarding the reuse address in relation to > the operated range. Instead, the caller will provide head and tail > vmemmap pages. > > Currently, vmemmap_head and vmemmap_tail are set to the same page, but > this will change in the future. > > The only functional change is that __hugetlb_vmemmap_optimize_folio() > will abandon optimization if memory allocation fails. > > Signed-off-by: Kiryl Shutsemau Reviewed-by: Muchun Song Thanks.