linux-kernel - Re: [PATCH v5 2/2] mm/sparse.c: allocate memmap preferring the given node

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Date:   Tue, 24 Mar 2020 09:07:21 +0800
From:   Baoquan He <bhe@...hat.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] mm/sparse.c: allocate memmap preferring the given
 node

Hi Andrew,

On 03/16/20 at 08:56pm, Baoquan He wrote:
> When allocating memmap for hot added memory with the classic sparse, the
> specified 'nid' is ignored in populate_section_memmap().
> 
> While in allocating memmap for the classic sparse during boot, the node
> given by 'nid' is preferred. And VMEMMAP prefers the node of 'nid' in
> both boot stage and memory hot adding. So seems no reason to not respect
> the node of 'nid' for the classic sparse when hot adding memory.
> 
> Use kvmalloc_node instead to use the passed in 'nid'.

Just checked linux-next, seems this one is missed. Michal suggested
splitting the old v4 into two patches, this patch is to use the passed
in 'nid' to allocate memmap with !VMEMMAP.

Thanks
Baoquan

> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Acked-by: Michal Hocko <mhocko@...e.com>
> Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  mm/sparse.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/sparse.c b/mm/sparse.c
> index 3fa407d7f70a..31dcdfb55c72 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -719,8 +719,8 @@ static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages)
>  struct page * __meminit populate_section_memmap(unsigned long pfn,
>  		unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
>  {
> -	return kvmalloc(array_size(sizeof(struct page),
> -				   PAGES_PER_SECTION), GFP_KERNEL);
> +	return kvmalloc_node(array_size(sizeof(struct page),
> +					PAGES_PER_SECTION), GFP_KERNEL, nid);
>  }
>  
>  static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,
> -- 
> 2.17.2
> 
>