Re: [PATCH v3 4/6] mm: Demote warning message in vmemmap_verify() to debug level

[Anshuman Khandual <anshuman.khandual@arm.com>]

On 6/8/22 06:56, mawupeng wrote:
> 
> 
> 在 2022/6/7 20:25, David Hildenbrand 写道:
>> On 07.06.22 11:38, Wupeng Ma wrote:
>>> From: Ma Wupeng <mawupeng1@huawei.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@huawei.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().

Why not pr_warn_ratelimited() like in the previous patch ?