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Wed, 04 Mar 2026 23:44:00 -0800 (PST) Message-ID: Date: Thu, 5 Mar 2026 15:43:54 +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] ACPI: add a boot parameter to disable parsing CFMWS during NUMA init To: Gregory Price 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 References: <20260304080647.169434-1-haifeng.xu@shopee.com> <8ad398f6-995a-489b-8ca2-f21afdce47e4@shopee.com> From: Haifeng Xu In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 2026/3/5 14:30, Gregory Price wrote: > 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 node，then 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) Yes，the patch you paste above worke well for us. Thanks！ > > ~Gregory