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SubjectRe: [PATCH] mm: huge_memory: add the missing folio_test_pmd_mappable() for THP split statistics
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On 2024/4/22 14:17, Lance Yang wrote:
> Hey Baolin,
>
> Maybe I spotted a bug and made a change to this patch as follows.
>
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 824eff9211db..f3c4e08c6d30 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -2994,6 +2994,7 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
> XA_STATE_ORDER(xas, &folio->mapping->i_pages, folio->index, new_order);
> struct anon_vma *anon_vma = NULL;
> struct address_space *mapping = NULL;
> + int order = folio_order(folio);
> int extra_pins, ret;
> pgoff_t end;
> bool is_hzp;
> @@ -3172,7 +3173,7 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
> i_mmap_unlock_read(mapping);
> out:
> xas_destroy(&xas);
> - if (folio_test_pmd_mappable(folio))
>
> IIUC, if we split the folio successfully, it won’t be large here.

Yes, good catch. I did a blindly copy-paste.

Will fix in next version. Thanks for reviewing.

> + if (order >= HPAGE_PMD_ORDER)
> count_vm_event(!ret ? THP_SPLIT_PAGE : THP_SPLIT_PAGE_FAILED);
> return ret;
> }
>
> Thanks,
> Lance

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