From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-12.mta0.migadu.com [91.218.175.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 62E743D8123 for ; Tue, 25 Aug 2026 10:47:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787654853; cv=none; b=uMTNDBcmlouzDzsAwlRlqTrMYbtup390wNSHvSH67fmSeLfrVtuc1BD0gSYxogFgEaD2rqxngKdwg980DM9RAcOM4z5VdBg1NU9qk64L1iU6Vm6nNYH1COFRAjENab9GDwdUOB/f7d5bK6Oty8AiddSfnTTFUEbg4gXuzIh3Qjs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787654853; c=relaxed/simple; bh=n2aH1LW4zBf5JFqhZeoA8jQ7gEcZolG4XK0C5vf317Q=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=P0/RJs7HLwGsXsUlv3qsbNDEX8Xh11qMRKuDU24g/WOYOLGUZwXlO0zE6Z805LbO7nOI0w6+gyxDcQ0r4iBZHGe7OB9fqds7v59zDYuhylHum7Fk3bz1w2RZKT8ZDxBCTNA0+58Gh9+QPsaFj945ADWySZFq7M+t86cam7F6tLE= 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=EBFnMX9+; arc=none smtp.client-ip=91.218.175.12 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="EBFnMX9+" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=n2aH1LW4zBf5JFqhZeoA8jQ7gEcZolG4XK0C5vf317Q=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1787654849; v=1; x=1788259649; b=EBFnMX9+WMZeQIjhoes8vZuXoMzmKBeNcF34h/QJ3lUokZZjOGsgaZ53PTc0uFRytXGrkSwG 4Fu2EjYsuPbFhYGUOpeeLbH3Rs7dWNw/7192bNoTE6xwZHiu6qT0FGU31AC+I6UpnI01kkliU/a iOLfz1EqjjLjaplEjE+Kxl0s= X-Envelope-To: linux-kernel@vger.kernel.org Received: from [100.82.85.74] (101.71.133.200) by smtp.migadu.com with ESMTPS id fa391d319a902b86; Tue, 25 Aug 2026 10:47:29 +0000 X-Mizu-Trace-ID: fa391d319a902b86 X-Migadu-Flow: FLOW_OUT Message-ID: <196ff683-13e2-475a-8cb4-cb0d94f08213@linux.dev> Date: Tue, 25 Aug 2026 18:47:20 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 05/17] mm/sparse-vmemmap: support section-based vmemmap accounting To: Muchun Song , Andrew Morton , Oscar Salvador , David Hildenbrand Cc: Mike Rapoport , Vlastimil Babka , Lorenzo Stoakes , Michal Hocko , David Laight , "Liam R . Howlett" , Suren Baghdasaryan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Muchun Song References: <20260825084608.47437-1-songmuchun@bytedance.com> <20260825084608.47437-6-songmuchun@bytedance.com> From: Qi Zheng In-Reply-To: <20260825084608.47437-6-songmuchun@bytedance.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 8/25/26 4:45 PM, Muchun Song wrote: > section_nr_vmemmap_pages() can account ordinary sections and DAX sections, > but section-based vmemmap optimization keeps its compound order in struct > mem_section and retains a different number of vmemmap pages. > > Teach section_nr_vmemmap_pages() to recognize section-based optimized > sections and calculate their vmemmap page count from the section order > and the HVO retained page count. > > Signed-off-by: Muchun Song > Acked-by: Mike Rapoport (Microsoft) > --- > v5: > - Collect Acked-by from Mike Rapoport > > v3: > - Add vmemmap_optimizable_order() for order-based optimization checks > > v2: > - Remove an unnecessary vmemmap_can_optimize() call to simplify the code > (suggested by Mike Rapoport). > - Rewrite the commit message for better understanding. > --- > include/linux/mmzone.h | 6 ++++-- > mm/sparse-vmemmap.c | 10 ++++++---- > mm/sparse.h | 16 ++++++++++++++++ > 3 files changed, 26 insertions(+), 6 deletions(-) > Acked-by: Qi Zheng Thanks, Qi