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[96.255.20.138]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8cbbf652bb6sm1949118285a.4.2026.03.04.22.30.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Mar 2026 22:30:06 -0800 (PST) Date: Thu, 5 Mar 2026 01:30:04 -0500 From: Gregory Price To: Haifeng Xu Cc: rafael@kernel.org, lenb@kernel.org, dan.j.williams@intel.com, jonathan.cameron@huawei.com, dave@stgolabs.net, dave.jiang@intel.com, alison.schofield@intel.com, vishal.l.verma@intel.com, ira.weiny@intel.com, linux-cxl@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ACPI: add a boot parameter to disable parsing CFMWS during NUMA init Message-ID: References: <20260304080647.169434-1-haifeng.xu@shopee.com> <8ad398f6-995a-489b-8ca2-f21afdce47e4@shopee.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=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <8ad398f6-995a-489b-8ca2-f21afdce47e4@shopee.com> On Thu, Mar 05, 2026 at 12:18:05PM +0800, Haifeng Xu wrote: > On 2026/3/5 01:16, Gregory Price wrote: > > On Wed, Mar 04, 2026 at 04:06:47PM +0800, Haifeng Xu wrote: > > Every memcg records shrinker info for each possible node. If we use online node > instead of possible nodeļ¼Œthen during memory hotplug, we must tarverse all memcgs > and shrinkers to check whether corresponding node has allocated the shrinker_info. > This way introduces more complexity. > Right, but some systems might actually WANT this many nodes, and this does not scale well at all as-is. I also don't think it's as complex as you think, most of the infrastructure is already there. > > If you're not actually using CXL, can't you just disable CXL in the > > BIOS? Then you shouldn't even emit CFMWS at all. > > I have asked our Intel Support Engineer, he saied that cxl can't be disabled > in BIOS. > Huh, this is surprising. If this is the case then see Dan's patch here: https://lore.kernel.org/linux-cxl/1f5074979a58803ec875dd10c9234c7b1a17192d.camel@intel.com/T/#m0d64b723a63ca7faf44311c52c1ebd5f280ae626 That should deal with your issue more cleanly. Otherwise, the problem you're describing here really should really be fixed with either better lock scoping or lazy-allocation. (Already poking at the issue a bit) ~Gregory