Re: [PATCH] mm/page_alloc: Add a reason for reserved pages in has_unmovable_pages()

[Anshuman Khandual]

On 10/03/2019 04:49 PM, Qian Cai wrote:
> 
> 
>> On Oct 3, 2019, at 5:32 AM, Anshuman Khandual <Anshuman.Khandual@xxxxxxx> wrote:
>>
>> Even though page flags does contain reserved bit information, the problem
>> is that we are explicitly printing the reason for this page dump. In this
>> case it is caused by the fact that it is a reserved page.
>>
>> page dumped because: <reason>
>>
>> The proposed change makes it explicit that the dump is caused because a
>> non movable page with reserved bit set. It also helps in differentiating 
>> between reserved bit condition and the last one "if (found > count)".
> 
> Then, someone later would like to add a reason for every different page flags just because they *think* they are special.
> 

Ohh, never meant that the 'Reserved' bit is anything special here but it
is a reason to make a page unmovable unlike many other flags.