linux-kernel - Re: [PATCH 5/6] mm: make free_area_init

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Date:   Thu, 27 Jan 2022 13:47:21 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        Alexey Makhalov <amakhalov@...are.com>,
        Dennis Zhou <dennis@...nel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Oscar Salvador <osalvador@...e.de>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Nico Pache <npache@...hat.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Rafael Aquini <raquini@...hat.com>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 5/6] mm: make free_area_init_node aware of memory less
 nodes

On 27.01.22 09:53, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
> 
> free_area_init_node is also called from memory less node initialization
> path (free_area_init_memoryless_node). It doesn't really make much sense
> to display the physical memory range for those nodes:
> Initmem setup node XX [mem 0x0000000000000000-0x0000000000000000]
> 
> Instead be explicit that the node is memoryless:
> Initmem setup node XX as memoryless
> 
> Acked-by: Rafael Aquini <raquini@...hat.com>
> Signed-off-by: Michal Hocko <mhocko@...e.com>
> ---
>  mm/page_alloc.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 32d0189de4c5..83da2279be72 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -7682,9 +7682,14 @@ static void __init free_area_init_node(int nid)
>  	pgdat->node_start_pfn = start_pfn;
>  	pgdat->per_cpu_nodestats = NULL;
>  
> -	pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
> -		(u64)start_pfn << PAGE_SHIFT,
> -		end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0);
> +	if (start_pfn != end_pfn) {
> +		pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
> +			(u64)start_pfn << PAGE_SHIFT,
> +			end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0);
> +	} else {
> +		pr_info("Initmem setup node %d as memoryless\n", nid);
> +	}
> +
>  	calculate_node_totalpages(pgdat, start_pfn, end_pfn);
>  
>  	alloc_node_mem_map(pgdat);

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb