linux-kernel - Re: [PATCH v3 0/7] hugetlb: parallelize hugetlb page init on boot

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Date: Wed, 3 Jan 2024 10:20:58 +0800
From: Gang Li <gang.li@...ux.dev>
To: David Rientjes <rientjes@...gle.com>
Cc: David Hildenbrand <david@...hat.com>,
 Mike Kravetz <mike.kravetz@...cle.com>, Muchun Song <muchun.song@...ux.dev>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Tim Chen <tim.c.chen@...ux.intel.com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, ligang.bdlg@...edance.com
Subject: Re: [PATCH v3 0/7] hugetlb: parallelize hugetlb page init on boot

On 2024/1/3 09:52, David Rientjes wrote:
> 
> I tested 1GB hugetlb on a smaller AMD host with the following:
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3301,7 +3301,7 @@ int alloc_bootmem_huge_page(struct hstate *h, int nid)
>   int __alloc_bootmem_huge_page(struct hstate *h, int nid)
>   {
>          struct huge_bootmem_page *m = NULL; /* initialize for clang */
> -       int nr_nodes, node;
> +       int nr_nodes, node = nid;
>   
>          /* do node specific alloc */
>          if (nid != NUMA_NO_NODE) {
> 

Oh, if nid != NUMA_NO_NODE and memblock_alloc_try_nid_raw succeed,
`node` must take the value of `nid`.

Otherwise, list_add(&m->list, &huge_boot_pages[node]) will not be
executed correctly.

> After the build error is fixed, feel free to add:
> 
> 	Tested-by: David Rientjes <rientjes@...gle.com>
> 

Thanks!

> to each patch.  I think Andrew will probably take a build fix up as a
> delta on top of patch 4 rather than sending a whole new series unless
> there is other feedback that you receive.