linux-kernel - Re: [PATCH 01/11] mm/page_isolation: prefer the node of the source page

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Message-ID: <20200521003716.GA317575@carbon.dhcp.thefacebook.com>
Date:   Wed, 20 May 2020 17:37:16 -0700
From:   Roman Gushchin <guro@...com>
To:     <js1304@...il.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <kernel-team@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Christoph Hellwig <hch@...radead.org>,
        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 01/11] mm/page_isolation: prefer the node of the source
 page

On Mon, May 18, 2020 at 10:20:47AM +0900, 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.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Roman Gushchin <guro@...com>

> ---
>  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]);

Why not new_page_nodemask(page, page_to_nid(page), &node_states[N_MEMORY]) ?
Still fits into 80 characters.