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SubjectRe: [PATCH] mm/hugetlb: use helper huge_page_size() to get hugepage size
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On 2/8/21 12:24 AM, Miaohe Lin wrote:
> We can use helper huge_page_size() to get the hugepage size directly to
> simplify the code slightly.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> mm/hugetlb.c | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 18628f8dbfb0..6cdb59d8f663 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3199,7 +3199,7 @@ void __init hugetlb_add_hstate(unsigned int order)
> BUG_ON(order == 0);
> h = &hstates[hugetlb_max_hstate++];
> h->order = order;
> - h->mask = ~((1ULL << (order + PAGE_SHIFT)) - 1);
> + h->mask = ~(huge_page_size(h) - 1);
> for (i = 0; i < MAX_NUMNODES; ++i)
> INIT_LIST_HEAD(&h->hugepage_freelists[i]);
> INIT_LIST_HEAD(&h->hugepage_activelist);
> @@ -3474,7 +3474,7 @@ void hugetlb_report_meminfo(struct seq_file *m)
> for_each_hstate(h) {
> unsigned long count = h->nr_huge_pages;
>
> - total += (PAGE_SIZE << huge_page_order(h)) * count;
> + total += huge_page_size(h) * count;
>
> if (h == &default_hstate)
> seq_printf(m,
> @@ -3487,10 +3487,10 @@ void hugetlb_report_meminfo(struct seq_file *m)
> h->free_huge_pages,
> h->resv_huge_pages,
> h->surplus_huge_pages,
> - (PAGE_SIZE << huge_page_order(h)) / 1024);
> + huge_page_size(h) / SZ_1K);
> }
>
> - seq_printf(m, "Hugetlb: %8lu kB\n", total / 1024);
> + seq_printf(m, "Hugetlb: %8lu kB\n", total / SZ_1K);
> }
>
> int hugetlb_report_node_meminfo(char *buf, int len, int nid)
> @@ -3524,7 +3524,7 @@ void hugetlb_show_meminfo(void)
> h->nr_huge_pages_node[nid],
> h->free_huge_pages_node[nid],
> h->surplus_huge_pages_node[nid],
> - 1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
> + huge_page_size(h) >> 10);

Should we change this to

huge_page_size(h) / SZ_1K);

as in hugetlb_report_meminfo above? Or, is that one where it takes an
additional instruction to do the divide as opposed to the shift? I would
rather add the instruction and keep everything consistent.
--
Mike Kravetz

> }
>
> void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm)
> @@ -3647,9 +3647,7 @@ static int hugetlb_vm_op_split(struct vm_area_struct *vma, unsigned long addr)
>
> static unsigned long hugetlb_vm_op_pagesize(struct vm_area_struct *vma)
> {
> - struct hstate *hstate = hstate_vma(vma);
> -
> - return 1UL << huge_page_shift(hstate);
> + return huge_page_size(hstate_vma(vma));
> }
>
> /*
>

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