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mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0

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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

Link: https://lkml.kernel.org/r/20250814102333.4428-1-lirongqing@baidu.com
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Tested-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Jane Chu <jane.chu@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Li RongQing
2025-08-14 18:23:33 +08:00
committed by Andrew Morton
parent 35224da7e3
commit b322e88b3d
1 changed files with 3 additions and 0 deletions
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3
mm/hugetlb.c
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@@ -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;