Re: [PATCH v3 2/4] mm: don't account memmap on failure

[David Hildenbrand]

On 08.08.24 17:42, Pasha Tatashin wrote:
> When in alloc_vmemmap_page_list() memmap is failed to allocate, do
> not account, the memory is going to be release at the function exit.

I would write it as

"When we fail to allocate the mmemmap in alloc_vmemmap_page_list(), do 
not account any already-allocated pages: we're going to free all them 
before we return from the function."

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

> Fixes: 15995a352474 ("mm: report per-page metadata information")
> Signed-off-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
> ---
>   mm/hugetlb_vmemmap.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
> index fa83a7b38199..70027869d844 100644
> --- a/mm/hugetlb_vmemmap.c
> +++ b/mm/hugetlb_vmemmap.c
> @@ -392,13 +392,10 @@ static int alloc_vmemmap_page_list(unsigned long start, unsigned long end,
>   
>   	for (i = 0; i < nr_pages; i++) {
>   		page = alloc_pages_node(nid, gfp_mask, 0);
> -		if (!page) {
> -			mod_node_page_state(NODE_DATA(nid), NR_MEMMAP, i);
> +		if (!page)
>   			goto out;
> -		}
>   		list_add(&page->lru, list);
>   	}
> -
>   	mod_node_page_state(NODE_DATA(nid), NR_MEMMAP, nr_pages);
>   
>   	return 0;

--
Cheers,

David / dhildenb