From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (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 2ED4533509F for ; Thu, 23 Oct 2025 15:29:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761233396; cv=none; b=I7KOErT3Xp7SMpZeXyi+e0Z/3tcPFMbHywaFnIBU7/BXISGIUMT5GKSXal6tZNjBALI0El1qfNCYSRLFzlt1coIJvWTbJOVZU7brvre4twXKseDwXkzWV+33PtpC8bIkUAkWkyVo4n3eJZcTUdjcZfhkD6/pxC5vFjD4mMK4c5c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761233396; c=relaxed/simple; bh=8E3D0qa57paFIg4aScAyLAje2xeCutpKH+ZDmexdwf0=; h=Date:From:To:CC:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=GoiB+qE5N4f+TFZ9lNmZ+0N638OQBtz722nsGrA1/NbcBH388g02A/SRv+oY6MViUF6y8EWxlkZMRDRwVKEcvgKnnkSzRJkO494dncg4CWfbsbOMC6SapivI22z6cpTCs9Rnkb/2z0KkbgxcBmNyP4FcF4W0jDmm2DCETfnAPWk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4csqgB1897z6L50b; Thu, 23 Oct 2025 23:28:22 +0800 (CST) Received: from dubpeml100005.china.huawei.com (unknown [7.214.146.113]) by mail.maildlp.com (Postfix) with ESMTPS id 1AD071402F5; Thu, 23 Oct 2025 23:29:50 +0800 (CST) Received: from localhost (10.203.177.15) by dubpeml100005.china.huawei.com (7.214.146.113) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Thu, 23 Oct 2025 16:29:48 +0100 Date: Thu, 23 Oct 2025 16:29:44 +0100 From: Jonathan Cameron To: Gregory Price CC: , Yiannis Nikolakopoulos , Wei Xu , David Rientjes , Matthew Wilcox , Bharata B Rao , , , , , , , , , , , , , , , , , , , , , , , , "Adam Manzanares" Subject: Re: [RFC PATCH v2 0/8] mm: Hot page tracking and promotion infrastructure Message-ID: <20251023162944.000074dd@huawei.com> In-Reply-To: References: <20251017153613.00004940@huawei.com> <20251020150526.000078b6@huawei.com> <20251022100950.00002785@huawei.com> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) 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" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: lhrpeml100010.china.huawei.com (7.191.174.197) To dubpeml100005.china.huawei.com (7.214.146.113) On Wed, 22 Oct 2025 11:05:16 -0400 Gregory Price wrote: > On Wed, Oct 22, 2025 at 10:09:50AM +0100, Jonathan Cameron wrote: > > > > My gut feeling is the need to do dynamic NUMA nodes will not be driven > > but this but more by large scale fabrics (if that ever happens) > > and trade offs of host PA space vs QoS in the hardware. Those > > trade offs might put memory with very different performance > > characteristics behind one window. > > > > I can't believe we live in a world where "We have to think about the > scenario where we actually need all 256 TB of 48-bit phys-addressing" > is not a tongue in cheek joke o_o You think everyone wires all the 48 bits? Certainly not everyone does. > > That's a paltry 2048 128GB DIMMs... and whatever monstrosity you have to > build to host it all but that's at least a fun engineering problem :V > > Bring on the 128-bit CPUs! > > What do we name those x86 registers though? Slap the E back on for ERAX? > > > Meh. Let's suggest people burn host PA space for now. If anyone hits > > that limit they can solve it (crosses fingers it's not my lot :) > > > > +1 > > ~Gregory