linux-kernel - Re: [FIX PATCH 1/2] mm/page_alloc: Print node fallback order

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Message-ID: <9c29181a-b188-ea61-9d86-0d8d0ca4ee04@arm.com>
Date:   Fri, 3 Sep 2021 10:01:36 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Bharata B Rao <bharata@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, kamezawa.hiroyu@...fujitsu.com,
        lee.schermerhorn@...com, mgorman@...e.de,
        Krupa.Ramakrishnan@....com, Sadagopan.Srinivasan@....com
Subject: Re: [FIX PATCH 1/2] mm/page_alloc: Print node fallback order



On 8/30/21 5:46 PM, Bharata B Rao wrote:
> Print information message about the allocation fallback order
> for each NUMA node during boot.
> 
> No functional changes here. This makes it easier to illustrate
> the problem in the node fallback list generation, which the
> next patch fixes.
> 
> Signed-off-by: Bharata B Rao <bharata@....com>
> ---
>  mm/page_alloc.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index eeb3a9cb36bb..22f7ad6ec11c 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6277,6 +6277,10 @@ static void build_zonelists(pg_data_t *pgdat)
>  
>  	build_zonelists_in_node_order(pgdat, node_order, nr_nodes);
>  	build_thisnode_zonelists(pgdat);
> +	pr_info("Fallback order for Node %d: ", local_node);
> +	for (node = 0; node < nr_nodes; node++)
> +		pr_cont("%d ", node_order[node]);
> +	pr_cont("\n");
>  }
>  
>  #ifdef CONFIG_HAVE_MEMORYLESS_NODES
> 

Node allocation preference sequence for a given accessing node is an
important information on large systems. This information during boot
and (hotplug --> online sequence) will help the user.

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>