From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta1.migadu.com (out-129.mta1.migadu.com [95.215.58.129]) (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 CFCF5348C66 for ; Mon, 21 Sep 2026 06:20:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.129 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789971622; cv=none; b=gC4DdJvmPetefI3y9wqHexeGoY4wkkLE9xd7ZUpdPBY0cP211+7o7cSG6VRX/aAOwKMoTQgY/29hoTcHOs/+4etVmtYTdMS9rVoCYPVRML1Bcchqsb2DQn2u30TUkerK36qCEZjSQd+r1F/l8sE9Z1pZX/nW7RysTikAtXCIqj0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789971622; c=relaxed/simple; bh=n/AdnmXxXRbpGFInqaTSJTt65XZiIYjARrVazbI6Wb0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ltQOSLWhIK7H8DUoWDJgy5YOgoXRI9hDy/b7rBOa5/DoErmypwNxp/RcGZXa7I4MPmgxVwWSjHnrNZzLg8h5TGUgzLraADPQ9uNlD7UiVxq3a+O5290cElMhd0GCSmkGsqCS7GD/BwggktTEpld6mxZhMLSTFcU5MfvkSfDnhF8= 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=WM4tumaP; arc=none smtp.client-ip=95.215.58.129 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="WM4tumaP" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=n/AdnmXxXRbpGFInqaTSJTt65XZiIYjARrVazbI6Wb0=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789971617; v=1; x=1790576417; b=WM4tumaPUMfSkp2/LhSaz0bfqlBPUiGV4paOgePn6ocrt2vV1GqT5T660mj1aSQ4tG7SXUpn oUBa5L6yv+db9pePHr4Zgl7QpdzOMDO6OX6zyMSI1hNv1jDl8OkTPSLdvKANRJf+Rd2nk8KboAc ieKZi6SvU5Pl1XufUEyEgVpc= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id f802e06ae86065bd; Mon, 21 Sep 2026 06:20:17 +0000 X-Mizu-Trace-ID: f802e06ae86065bd X-Migadu-Flow: FLOW_OUT Message-ID: <32b465d4-0881-425e-a199-f40af05f48fa@linux.dev> Date: Mon, 21 Sep 2026 14:19:56 +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 02/17] perf/ring_buffer: stop using PG_private as AUX page high-order marker Content-Language: en-US To: Zi Yan Cc: linux-mm@kvack.org, Suren Baghdasaryan , linux-kernel@vger.kernel.org, Ryan Roberts , Johannes Weiner , David Hildenbrand , Nico Pache , Peter Zijlstra , Lorenzo Stoakes , Mike Rapoport , "Matthew Wilcox (Oracle)" , Usama Arif , Barry Song , Dev Jain , Ingo Molnar , Andrew Morton , Alistair Popple , Qi Zheng , "Liam R. Howlett" , Arnaldo Carvalho de Melo , Namhyung Kim , Thomas Gleixner , Borislav Petkov , Kairui Song , Shakeel Butt , Dave Hansen , x86@kernel.org, Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , "H. Peter Anvin" , linux-perf-users@vger.kernel.org, Gregory Price , Ying Huang , Baolin Wang , Michal Hocko , Vlastimil Babka , Muchun Song References: <20260920-remove-pg_private-v5-0-bb68b6a21869@nvidia.com> <20260920-remove-pg_private-v5-2-bb68b6a21869@nvidia.com> From: Lance Yang In-Reply-To: <20260920-remove-pg_private-v5-2-bb68b6a21869@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2026/9/21 10:27, Zi Yan wrote: > A high-order AUX page sets PG_private on its first page and stores the > order in first_page->private. Stop using PG_private and check > first_page->private for AUX page order only in the ring buffer and its > users. This is fine because page->private is 0 for order-0 AUX pages, > matching the page order. > > It prepares for a future commit that remove PG_private. > > No functional change intended. > > Assisted-by: LLM > To: Peter Zijlstra > To: Ingo Molnar > To: Arnaldo Carvalho de Melo > To: Namhyung Kim > To: Thomas Gleixner > To: Borislav Petkov > To: Dave Hansen > To: x86@kernel.org > Cc: Mark Rutland > Cc: Alexander Shishkin > Cc: Jiri Olsa > Cc: Ian Rogers > Cc: Adrian Hunter > Cc: James Clark > Cc: "H. Peter Anvin" > Cc: linux-perf-users@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Acked-by: Usama Arif > Acked-by: David Hildenbrand (Arm) > Signed-off-by: Zi Yan > --- Nice cleanup! Feel free to add: Reviewed-by: Lance Yang