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

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Date:   Wed, 8 Jun 2022 09:26:33 +0800
From:   mawupeng <mawupeng1@...wei.com>
To:     <david@...hat.com>, <corbet@....net>, <will@...nel.org>,
        <ardb@...nel.org>, <catalin.marinas@....com>
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        <dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...or.com>,
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        <linux-mm@...ck.org>, <linux-riscv@...ts.infradead.org>,
        <mawupeng1@...wei.com>
Subject: Re: [PATCH v3 4/6] mm: Demote warning message in vmemmap_verify() to
 debug level



在 2022/6/7 20:25, David Hildenbrand 写道:
> 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()?
> 

Sure.

This will works. We can certainly use a pr_warn_once().