From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=91.218.175.174 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793515916; b=qR6TANSw60Atm5oAsEkZw2b7yKuzMmp1n4oGGqsdWWGGhqNHUqjEHt8JIBUHJuJo59v4 7OZ7icDaqlbw3AVFfbxzRUEZTHx1GuFxgTB87mLnotnTbL6hIZcl4We7rIi3icl8aacyF dCXKwiRsgste9pApeCfudfwl7szzqF//QCmzSW8LefvWSfBjlbsNBP8aaGvYckRDpeW7g sh+mH3arcC9LrWzhWH2HwnzLGD2PThAB2wdvjNq8YsImmMaHNtAta9RxK8sk7iHNuTw9i 6ht57yNmAMY2JU6OieTFKynkScBK0HOxQj/m63MzQMGPLOV8tY2jZBZtbbV2jcAyRqg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793515916; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:Message-ID:Date:MIME-Version:User-Agent: Subject:To:Cc:References:From:In-Reply-To:Content-Type: Content-Transfer-Encoding; bh=tuwGBOzAiVCP+vrlW5UwmQsu01V4i5/BJRy78zItdGE=; b=CVR169PSPIWJVhLsFkdnjiElbjxXb5rZNvdV94qVQ1VVjRQGg1ZT60ooN2ycHHAzJ5BV eAnJh64RRf1nzlLlFMfR/aGEK6fXUv29xg1p2QkNKFSc9BVsF4R2bHzxRYLohBSRLge+3 g7Ow7h18cGcS8bxkn+onAyFBix9/Fchr+yXnWZYQidL8wkaXqoXzupENnOYJf4yBHt8a8 6tSdlNuqEOt9LNZkieT0+tZr7eedJXn8XKvphfTSYXvvB0QrEOP5WFF67XfamVNV4oZcg zxIFHiE1noublhXGlw1LyvlqCHJeygJE24TVDj3pvVz2QLdDJw3cv2QfcIV7wkjbMqg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b="Ko/MkeP/"; arc=none smtp.remote-ip=91.218.175.174 Received: from mta0.migadu.com (out-174.mta0.migadu.com [91.218.175.174]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2DA84606A324 for ; Sun, 1 Nov 2026 06:51:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 2DA84606A324 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, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=Ko/MkeP/ X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=VLeE2/rDXpLDVi9e5DrH1IIJumuqSoLutYfcLgv+pXA=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793515913; v=1; x=1794120713; b=Ko/MkeP/JuNRQcANUqPeEjZdTGUFRZxfe0Z8Sv05EKfQJ87wbcFQnbfn3Xwgno6gb88NaTEX Mdfqr8dIuqvo2Q2KNGq22CqfsBd/gtugHlAWAebky3j5j4iT0t7KmpZgwuBUHoj5E/VNcIIiJBS MjIhgDLZ4eEhHtK3xHUcDhwY= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 43a291ed986079d8; Sun, 01 Nov 2026 06:51:53 +0000 X-Mizu-Trace-ID: 43a291ed986079d8 X-Migadu-Flow: FLOW_OUT Message-ID: <2fb322ca-d54f-465e-b342-cb4e3ce55621@linux.dev> Date: Sun, 1 Nov 2026 14:51:47 +0800 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 05/12] mm: hugetlb_vmemmap: unify writable vmemmap page preparation To: Muchun Song , Oscar Salvador , Andrew Morton , Mike Rapoport Cc: Lance Yang , James Houghton , David Hildenbrand , Muchun Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20261020115306.813483-1-songmuchun@bytedance.com> <20261020115824.823278-1-songmuchun@bytedance.com> <20261020115824.823278-4-songmuchun@bytedance.com> From: Qi Zheng In-Reply-To: <20261020115824.823278-4-songmuchun@bytedance.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/20/26 7:58 PM, Muchun Song wrote: > Installing a writable vmemmap page requires consuming a replacement page, > copying the current contents into it and making the copy visible before > publishing the new mapping. HVO currently splits this sequence between > the page-table walker and its caller depending on the remap path. > > Centralize the sequence in the walker so all writable replacements follow > the same copy-and-publish protocol. This keeps page preparation with the This makes the copy-and-publish protocol much more solid and easier to reason about. Nice cleanup! > mapping update and removes path-specific handling from higher-level HVO > code. > > No functional change intended. > > Signed-off-by: Muchun Song > --- > mm/hugetlb_vmemmap.c | 40 +++++++++++++++++----------------------- > 1 file changed, 17 insertions(+), 23 deletions(-) > Reviewed-by: Qi Zheng Thanks, Qi