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

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Message-ID: <20200609124344.GC22623@dhcp22.suse.cz>
Date:   Tue, 9 Jun 2020 14:43:44 +0200
From:   Michal Hocko <mhocko@...nel.org>
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>,
        Roman Gushchin <guro@...com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 01/12] mm/page_isolation: prefer the node of the
 source page

On Wed 27-05-20 15:44:52, Joonsoo Kim 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.
> 
> Acked-by: Roman Gushchin <guro@...com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Michal Hocko <mhocko@...e.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]);
>  }
> -- 
> 2.7.4

-- 
Michal Hocko
SUSE Labs