* [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0
@ 2025-08-14 10:23 lirongqing
2025-08-15 7:02 ` Dev Jain
2025-08-18 2:21 ` jane.chu
0 siblings, 2 replies; 6+ messages in thread
From: lirongqing @ 2025-08-14 10:23 UTC (permalink / raw)
To: muchun.song, osalvador, david, akpm, linux-mm, linux-kernel; +Cc: Li RongQing
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;
--
2.9.4
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0
2025-08-14 10:23 [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0 lirongqing
@ 2025-08-15 7:02 ` Dev Jain
2025-08-18 2:21 ` jane.chu
1 sibling, 0 replies; 6+ messages in thread
From: Dev Jain @ 2025-08-15 7:02 UTC (permalink / raw)
To: lirongqing, muchun.song, osalvador, david, akpm, linux-mm, linux-kernel
On 14/08/25 3:53 pm, 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;
Useful change!
Reviewed-by: Dev Jain <dev.jain@arm.com>
Tested-by: Dev Jain <dev.jain@arm.com>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0
2025-08-14 10:23 [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0 lirongqing
2025-08-15 7:02 ` Dev Jain
@ 2025-08-18 2:21 ` jane.chu
2025-08-18 2:59 ` Andrew Morton
1 sibling, 1 reply; 6+ messages in thread
From: jane.chu @ 2025-08-18 2:21 UTC (permalink / raw)
To: lirongqing, muchun.song, osalvador, david, akpm, linux-mm, linux-kernel
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: ?
Reviewed-by: Jane Chu <jane.chu@oracle.com>
thanks!
-jane
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0
2025-08-18 2:21 ` jane.chu
@ 2025-08-18 2:59 ` Andrew Morton
2025-08-18 7:46 ` David Hildenbrand
0 siblings, 1 reply; 6+ messages in thread
From: Andrew Morton @ 2025-08-18 2:59 UTC (permalink / raw)
To: jane.chu
Cc: lirongqing, muchun.song, osalvador, david, linux-mm, linux-kernel
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: ?
Sure, I did that.
A Fixes: would be nice, to tell the -stable maintainers how far back in
time we need this, but the target sommit isn't obvious.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0
2025-08-18 2:59 ` Andrew Morton
@ 2025-08-18 7:46 ` David Hildenbrand
2025-08-19 22:59 ` Andrew Morton
0 siblings, 1 reply; 6+ messages in thread
From: David Hildenbrand @ 2025-08-18 7:46 UTC (permalink / raw)
To: Andrew Morton, jane.chu
Cc: lirongqing, muchun.song, osalvador, linux-mm, linux-kernel
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
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0
2025-08-18 7:46 ` David Hildenbrand
@ 2025-08-19 22:59 ` Andrew Morton
0 siblings, 0 replies; 6+ messages in thread
From: Andrew Morton @ 2025-08-19 22:59 UTC (permalink / raw)
To: David Hildenbrand
Cc: jane.chu, lirongqing, muchun.song, osalvador, linux-mm, linux-kernel
On Mon, 18 Aug 2025 09:46:59 +0200 David Hildenbrand <david@redhat.com> wrote:
> >>> 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?
>
To prevent the
> [ 3.702280] HugeTLB: allocation took 0ms with hugepage_allocation_threads=32
message when hugetlb pages are disabled.
Yeah, I guess it isn't very important. I'll destabilize the patch.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2025-08-14 10:23 [PATCH][v2] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0 lirongqing
2025-08-15 7:02 ` Dev Jain
2025-08-18 2:21 ` jane.chu
2025-08-18 2:59 ` Andrew Morton
2025-08-18 7:46 ` David Hildenbrand
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