Re: [PATCH v6 2/9] mm/page_owner: add MR_NEVER to enum migrate_reason and use it for last_migrate_reason

在 2026/7/14 22:44, David Hildenbrand (Arm) 写道:
> On 7/14/26 15:49, Vlastimil Babka (SUSE) wrote:
>> On 7/14/26 15:22, David Hildenbrand (Arm) wrote:
>>> On 7/14/26 15:09, Vlastimil Babka (SUSE) wrote:
>>>>
>>>> It's not used ever as a reason that would be actually passed to migration.
>>>
>>> Right, it's a placeholder for "there is no migrate reason because it is unset"
>>>
>>>> So I think the name is more descriptive this way.
>>>
>>> Not sure I agree. The usual translation of -1 -> unset is NONE or UNSET.
>>
>> (note it's no longer -1 after the patch.)
>>
>>> At least I was confused by "NEVER".
>>
>> I won't bikeshed this, so whatever.
> 
> Just to be clear: if everybody here agrees that MR_NEVER is the right thing to
> use, fine with me.
> 
> I just stumbled over it and it caught my attention.
> 
>>
>> Just to avoid another extra respin, please also say how the following line
>> should change, as if we only rename MR_NEVER to MR_NONE, it will be:
>>
>> +	EMe(MR_NONE,		"never_migrated")
> 
> I would probably just have use "not set".
> 
> And if "last_migrate_reason == MR_NONE" that would imply "never".
> 
> Ye Liu, feel free to keep it as is if you agree that using NEVER is better here.
> 
> 
Let's keep things as they are.

-- 
Thanks,
Ye Liu