Re: [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0

[David Hildenbrand <david@redhat.com>]

On 18.08.25 04:59, Andrew Morton wrote:
> On Sun, 17 Aug 2025 19:21:54 -0700 jane.chu@oracle.com wrote:
> 
>>
>> On 8/14/2025 3:23 AM, lirongqing wrote:
>>> From: Li RongQing <lirongqing@baidu.com>
>>>
>>> Optimize hugetlb_pages_alloc_boot() to return immediately when
>>> max_huge_pages is 0, avoiding unnecessary CPU cycles and the below
>>> log message when hugepages aren't configured in the kernel command
>>> line.
>>> [    3.702280] HugeTLB: allocation took 0ms with hugepage_allocation_threads=32
>>>
>>> Signed-off-by: Li RongQing <lirongqing@baidu.com>
>>> ---
>>> diff with v1: adding the reduced log messages in commit header
>>>
>>>    mm/hugetlb.c | 3 +++
>>>    1 file changed, 3 insertions(+)
>>>
>>> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
>>> index 753f99b..514fab5 100644
>>> --- a/mm/hugetlb.c
>>> +++ b/mm/hugetlb.c
>>> @@ -3654,6 +3654,9 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
>>>    		return;
>>>    	}
>>>    
>>> +	if (!h->max_huge_pages)
>>> +		return;
>>> +
>>>    	/* do node specific alloc */
>>>    	if (hugetlb_hstate_alloc_pages_specific_nodes(h))
>>>    		return;
>>
>> Looks good.  Could you add stable: ?

Can you elaborate why you think this is stable material?

> 
> Sure, I did that.

I don't think this is stable material, but for the change itself

Acked-by: David Hildenbrand <david@redhat.com>

-- 
Cheers

David / dhildenb