From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gentwo.org (gentwo.org [62.72.0.81]) (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 3C629287259 for ; Fri, 21 Nov 2025 21:54:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.72.0.81 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763762073; cv=none; b=kLweC+BkJOh01kOt3h78cQo7r3xEouq/TahBWS8VbVT+GZSC8nwpjUUmali5Hn33VU1GDCgE2tHcs0xF0LK8ZceW8OBxha8M9H2mP4hIjK1C6dqhHjRWP7V6XCrOf9tsQ4TAkNxRff5EZI4ydEnoDesHMS0oWjY+fp7ky4ikSlo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763762073; c=relaxed/simple; bh=oNTyimO871Xt4NO/18w82UlZYwpwaAQDmJMcKdNIrJI=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References: MIME-Version:Content-Type; b=tWaJhtB7Eaod7f2HPFzb/xTfSalkc4vu9PPEf/peblaBtrd17vp7NFjFOGSrQAFb9gjXmwzKH66J58NMjD9JJwNUhkMiRNMAfn5KiaqVEcqbcGAfTGp2UGCEzPgBjDTzyuZBQ6ks5SDJ3g6IwWyYMPIhPIUOjjFeiomSg+wkaao= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=gentwo.org; spf=pass smtp.mailfrom=gentwo.org; dkim=pass (1024-bit key) header.d=gentwo.org header.i=@gentwo.org header.b=baHE14Dn; arc=none smtp.client-ip=62.72.0.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=gentwo.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gentwo.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=gentwo.org header.i=@gentwo.org header.b="baHE14Dn" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gentwo.org; s=default; t=1763762071; bh=oNTyimO871Xt4NO/18w82UlZYwpwaAQDmJMcKdNIrJI=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=baHE14DnqToLTpcWLV46ykovAGTwpYPj3FZvzSllhHkUJgKI1zSX15TUWTNKHXcfd 1PjSVeabs3ddZLW+xnka3d2clFeKZq1e2szriin2SISK9xkx6Twx8OOM+pp3CVaIUG vbGCZ2FSIOa5R/qx+zQW39Xd2nZk1jf90UtgG3rY= Received: by gentwo.org (Postfix, from userid 1003) id 6E057402BA; Fri, 21 Nov 2025 13:54:31 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by gentwo.org (Postfix) with ESMTP id 6CEDD402B9; Fri, 21 Nov 2025 13:54:31 -0800 (PST) Date: Fri, 21 Nov 2025 13:54:31 -0800 (PST) From: "Christoph Lameter (Ampere)" To: Yang Shi cc: catalin.marinas@arm.com, will@kernel.org, ryan.roberts@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [v4 PATCH] arm64: mm: show direct mapping use in /proc/meminfo In-Reply-To: <20251121193437.2147939-1-yang@os.amperecomputing.com> Message-ID: <7a1ac262-c992-6ef3-421d-b4419a0c4e19@gentwo.org> References: <20251121193437.2147939-1-yang@os.amperecomputing.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII On Fri, 21 Nov 2025, Yang Shi wrote: > Although ptdump also can tell the direct map use, but it needs to dump > the whole kernel page table. It is costly and overkilling. It is also > in debugfs which may not be enabled by all distros. So showing direct > map use in /proc/meminfo seems more convenient and has less overhead. Also done the same way on x86, parisc, powerpc and s390. Reviewed-by: Christoph Lameter (Ampere)