linux-kernel - RE: Re: [PATCH] mm/hugetlb: two-phase hugepage allocation when reservation is high

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Message-ID: <73da268715754133b787f22e016a903c@baidu.com>
Date: Wed, 27 Aug 2025 12:33:35 +0000
From: "Li,Rongqing" <lirongqing@...du.com>
To: David Hildenbrand <david@...hat.com>, "muchun.song@...ux.dev"
	<muchun.song@...ux.dev>, "osalvador@...e.de" <osalvador@...e.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "linux-mm@...ck.org"
	<linux-mm@...ck.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "giorgitchankvetadze1997@...il.com"
	<giorgitchankvetadze1997@...il.com>
CC: "Xu,Wenjie(ACG CCN)" <xuwenjie04@...du.com>
Subject: RE: Re: [PATCH] mm/hugetlb: two-phase hugepage allocation when
 reservation is high

> Not sure if something like the following could fly:
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c index
> 1f42186a85ea4..dfb4d717b8a02 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3595,8 +3595,6 @@ static unsigned long __init
> hugetlb_pages_alloc_boot(struct hstate *h)
>          unsigned long jiffies_end;
> 
>          job.thread_fn   = hugetlb_pages_alloc_boot_node;
> -       job.start       = 0;
> -       job.size        = h->max_huge_pages;
> 
>          /*
>           * job.max_threads is 25% of the available cpu threads by default.
> @@ -3620,10 +3618,24 @@ static unsigned long __init
> hugetlb_pages_alloc_boot(struct hstate *h)
>          }
> 
>          job.max_threads = hugepage_allocation_threads;
> -       job.min_chunk   = h->max_huge_pages /
> hugepage_allocation_threads;
> 
>          jiffies_start = jiffies;
> -       padata_do_multithreaded(&job);
> +       /* TODO: comment why we retry and how it interacts with
> vmemmap op. */
> +       while (h->nr_huge_pages != h->max_huge_pages) {
> +               unsigned long remaining = h->max_huge_pages -
> + h->nr_huge_pages;
> +
> +               job.start       = h->nr_huge_pages;
> +               job.size        = remaining;
> +               job.min_chunk   = remaining /
> hugepage_allocation_threads;
> +               padata_do_multithreaded(&job);
> +
> +               if (hugetlb_vmemmap_optimizable(h))
> +                       break;

It should be:
           if (!hugetlb_vmemmap_optimizable(h))
                     break;

other is fine to me

thanks

-Li


> +
> +               /* Stop if there is no progress. */
> +               if (remaining == h->max_huge_pages - h->nr_huge_pages)
> +                       break;
> +       }
>          jiffies_end = jiffies;
> 
>          pr_info("HugeTLB: allocation took %dms with
> hugepage_allocation_threads=%ld\n",
> 
> 
> --
> Cheers
> 
> David / dhildenb