Re: [PATCH] ACPI: add a boot parameter to disable parsing CFMWS during NUMA init

[Haifeng Xu]

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@xxxxxxxxx/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