Re: [PATCH v23 5/9] mm: hugetlb: defer freeing of HugeTLB pages

[Oscar Salvador]

On Mon, May 10, 2021 at 11:00:23AM +0800, Muchun Song wrote:
> In the subsequent patch, we should allocate the vmemmap pages when
> freeing a HugeTLB page. But update_and_free_page() can be called
> under any context, so we cannot use GFP_KERNEL to allocate vmemmap
> pages. However, we can defer the actual freeing in a kworker to
> prevent from using GFP_ATOMIC to allocate the vmemmap pages.
> 
> The __update_and_free_page() is where the call to allocate vmemmmap
> pages will be inserted.
> 
> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>

Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>


-- 
Oscar Salvador
SUSE L3