linux-kernel - Re: [PATCH v3 1/3] mm/memblock: introduce a new helper memblock_estimated_nr

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Message-ID: <1f10c189-73c3-45fd-b249-88884f3dc3a9@redhat.com>
Date: Fri, 5 Jul 2024 12:16:14 +0200
From: David Hildenbrand <david@...hat.com>
To: Mike Rapoport <rppt@...nel.org>, Wei Yang <richard.weiyang@...il.com>
Cc: akpm@...ux-foundation.org, brauner@...nel.org, oleg@...hat.com,
 mjguzik@...il.com, tandersen@...flix.com, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] mm/memblock: introduce a new helper
 memblock_estimated_nr_pages()

On 05.07.24 11:09, Mike Rapoport wrote:
> On Wed, Jul 03, 2024 at 12:51:49AM +0000, Wei Yang wrote:
>> Instead of using raw memblock api, we wrap a new helper for user.
> 
> The changelog should be more elaborate and explain why this function is
> needed.
>   
>> Signed-off-by: Wei Yang <richard.weiyang@...il.com>
>> ---
>>   include/linux/memblock.h |  1 +
>>   mm/memblock.c            | 19 +++++++++++++++++++
>>   2 files changed, 20 insertions(+)
>>
>> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
>> index 40c62aca36ec..7d1c32b3dc12 100644
>> --- a/include/linux/memblock.h
>> +++ b/include/linux/memblock.h
>> @@ -486,6 +486,7 @@ static inline __init_memblock bool memblock_bottom_up(void)
>>   
>>   phys_addr_t memblock_phys_mem_size(void);
>>   phys_addr_t memblock_reserved_size(void);
>> +unsigned long memblock_estimated_nr_pages(void);
>>   phys_addr_t memblock_start_of_DRAM(void);
>>   phys_addr_t memblock_end_of_DRAM(void);
>>   void memblock_enforce_memory_limit(phys_addr_t memory_limit);
>> diff --git a/mm/memblock.c b/mm/memblock.c
>> index e81fb68f7f88..c1f1aac0459f 100644
>> --- a/mm/memblock.c
>> +++ b/mm/memblock.c
>> @@ -1729,6 +1729,25 @@ phys_addr_t __init_memblock memblock_reserved_size(void)
>>   	return memblock.reserved.total_size;
>>   }
>>   
>> +/**
>> + * memblock_estimated_nr_pages - return number of pages from memblock point of
>> + * view
> 
> This function returns the estimate for free pages, not the number of pages
> in RAM.
> 
> How about memblock_estimated_nr_free_pages()?

I was just about to comment exactly that. Agreed!

-- 
Cheers,

David / dhildenb