linux-kernel - Re: [PATCH v2 01/12] mm/page_isolation: prefer the node of the source page

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Date:   Thu, 28 May 2020 17:34:26 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     js1304@...il.com, Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        kernel-team@....com, Christoph Hellwig <hch@...radead.org>,
        Roman Gushchin <guro@...com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Michal Hocko <mhocko@...e.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 01/12] mm/page_isolation: prefer the node of the source
 page

On 5/27/20 8:44 AM, js1304@...il.com wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> For locality, it's better to migrate the page to the same node
> rather than the node of the current caller's cpu.

Should be, yeah.

> Acked-by: Roman Gushchin <guro@...com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/page_isolation.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/page_isolation.c b/mm/page_isolation.c
> index 2c11a38..7df89bd 100644
> --- a/mm/page_isolation.c
> +++ b/mm/page_isolation.c
> @@ -300,5 +300,7 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
>  
>  struct page *alloc_migrate_target(struct page *page, unsigned long private)
>  {
> -	return new_page_nodemask(page, numa_node_id(), &node_states[N_MEMORY]);
> +	int nid = page_to_nid(page);
> +
> +	return new_page_nodemask(page, nid, &node_states[N_MEMORY]);

I wonder why this and others uses node_states[N_MEMORY] and not just NULL. But
maybe that's addressed later.

>  }
>