linux-kernel - Re: [PATCH v3 4/6] mm: Demote warning message in vmemmap

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Message-ID: <b1975f44-2552-a03c-bb6f-1452f1fd99c0@redhat.com>
Date:   Tue, 7 Jun 2022 14:25:47 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Wupeng Ma <mawupeng1@...wei.com>, corbet@....net, will@...nel.org,
        ardb@...nel.org, catalin.marinas@....com
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        dvhart@...radead.org, andy@...radead.org, rppt@...nel.org,
        akpm@...ux-foundation.org, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, paulmck@...nel.org,
        keescook@...omium.org, songmuchun@...edance.com,
        rdunlap@...radead.org, damien.lemoal@...nsource.wdc.com,
        swboyd@...omium.org, wei.liu@...nel.org, robin.murphy@....com,
        anshuman.khandual@....com, thunder.leizhen@...wei.com,
        wangkefeng.wang@...wei.com, gpiccoli@...lia.com,
        chenhuacai@...nel.org, geert@...ux-m68k.org, chenzhou10@...wei.com,
        vijayb@...ux.microsoft.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 4/6] mm: Demote warning message in vmemmap_verify() to
 debug level

On 07.06.22 11:38, Wupeng Ma wrote:
> From: Ma Wupeng <mawupeng1@...wei.com>
> 
> For a system only have limited mirrored memory or some numa node without
> mirrored memory, the per node vmemmap page_structs prefer to allocate
> memory from mirrored region, which will lead to vmemmap_verify() in
> vmemmap_populate_basepages() report lots of warning message.
> 
> This patch demote the "potential offnode page_structs" warning messages
> to debug level to avoid a very long print during bootup.
> 
> Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
> ---
>  mm/sparse-vmemmap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
> index f4fa61dbbee3..78debdb89eb1 100644
> --- a/mm/sparse-vmemmap.c
> +++ b/mm/sparse-vmemmap.c
> @@ -528,7 +528,7 @@ void __meminit vmemmap_verify(pte_t *pte, int node,
>  	int actual_node = early_pfn_to_nid(pfn);
>  
>  	if (node_distance(actual_node, node) > LOCAL_DISTANCE)
> -		pr_warn("[%lx-%lx] potential offnode page_structs\n",
> +		pr_debug("[%lx-%lx] potential offnode page_structs\n",
>  			start, end - 1);
>  }
>  

This will possibly hide it in environments where this might indeed
indicate performance issues.

What about a pr_warn_once()?

-- 
Thanks,

David / dhildenb