Re: [PATCH v5 6/8] mm: Introduce deferred freeing for kernel page tables

[David Hildenbrand <david@redhat.com>]

On 19.09.25 07:40, Lu Baolu wrote:
> From: Dave Hansen <dave.hansen@linux.intel.com>
> 
> This introduces a conditional asynchronous mechanism, enabled by
> CONFIG_ASYNC_PGTABLE_FREE. When enabled, this mechanism defers the freeing
> of pages that are used as page tables for kernel address mappings. These
> pages are now queued to a work struct instead of being freed immediately.
> 
> This deferred freeing provides a safe context for a future patch to add
> an IOMMU-specific callback, which might be expensive on large-scale
> systems. This ensures the necessary IOMMU cache invalidation is performed
> before the page is finally returned to the page allocator outside of any
> critical, non-sleepable path.
> 
> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> ---

Can we please squash #7 in here and make sure to call the config knob 
something that indicates that it is for *kernel* page tables only?

ASYNC_KERNEL_PGTABLE_FREE

or sth like that.

-- 
Cheers

David / dhildenb