linux-kernel - Re: [PATCH v2 9/9] mm/hugetlb: convert move_hugetlb

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Date:   Wed, 2 Nov 2022 15:01:25 +0800
From:   Muchun Song <muchun.song@...ux.dev>
To:     Sidhartha Kumar <sidhartha.kumar@...cle.com>
Cc:     linux-kernel@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Muchun Song <songmuchun@...edance.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mina Almasry <almasrymina@...gle.com>,
        Miaohe Lin <linmiaohe@...wei.com>, minhquangbui99@...il.com,
        aneesh.kumar@...ux.ibm.com
Subject: Re: [PATCH v2 9/9] mm/hugetlb: convert move_hugetlb_state() to folios



> On Nov 2, 2022, at 06:30, Sidhartha Kumar <sidhartha.kumar@...cle.com> wrote:
> 
> Clean up unmap_and_move_huge_page() by converting move_hugetlb_state() to
> take in folios.
> 
> Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
> Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>

Reviewed-by: Muchun Song <songmuchun@...edance.com>

A nit below.

> ---
> include/linux/hugetlb.h |  6 +++---
> mm/hugetlb.c            | 22 ++++++++++++----------
> mm/migrate.c            |  4 ++--
> 3 files changed, 17 insertions(+), 15 deletions(-)
> 
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index d81f139193aa..375cd57721d6 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -184,7 +184,7 @@ int get_hwpoison_huge_page(struct page *page, bool *hugetlb, bool unpoison);
> int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
> bool *migratable_cleared);
> void putback_active_hugepage(struct page *page);
> -void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
> +void move_hugetlb_state(struct folio *old_folio, struct folio *new_folio, int reason);
> void free_huge_page(struct page *page);
> void hugetlb_fix_reserve_counts(struct inode *inode);
> extern struct mutex *hugetlb_fault_mutex_table;
> @@ -440,8 +440,8 @@ static inline void putback_active_hugepage(struct page *page)
> {
> }
> 
> -static inline void move_hugetlb_state(struct page *oldpage,
> - struct page *newpage, int reason)
> +static inline void move_hugetlb_state(struct folio *old_folio,
> + struct folio *new_folio, int reason)
> {
> }
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 2ecc0a6cf883..2ab8f3b7132a 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -7289,15 +7289,15 @@ void putback_active_hugepage(struct page *page)
> put_page(page);
> }
> 
> -void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason)
> +void move_hugetlb_state(struct folio *old_folio, struct folio *new_folio, int reason)
> {
> - struct hstate *h = page_hstate(oldpage);
> + struct hstate *h = folio_hstate(old_folio);
> 
> - hugetlb_cgroup_migrate(page_folio(oldpage), page_folio(newpage));
> - set_page_owner_migrate_reason(newpage, reason);
> + hugetlb_cgroup_migrate(old_folio, new_folio);
> + set_page_owner_migrate_reason(&new_folio->page, reason);
> 
> /*
> - * transfer temporary state of the new huge page. This is
> + * transfer temporary state of the new hugetlb folio. This is
> * reverse to other transitions because the newpage is going to
> * be final while the old one will be freed so it takes over
> * the temporary status.
> @@ -7306,12 +7306,14 @@ void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason)
> * here as well otherwise the global surplus count will not match
> * the per-node's.
> */
> - if (HPageTemporary(newpage)) {
> - int old_nid = page_to_nid(oldpage);
> - int new_nid = page_to_nid(newpage);
> + if (folio_test_hugetlb_temporary(new_folio)) {
> + int old_nid = folio_nid(old_folio);
> + int new_nid = folio_nid(new_folio);
> +
> +

Please remove this redundant blank line.

Thanks.

> + folio_set_hugetlb_temporary(old_folio);
> + folio_clear_hugetlb_temporary(new_folio);
> 
> - SetHPageTemporary(oldpage);
> - ClearHPageTemporary(newpage);
> 
> /*
> * There is no need to transfer the per-node surplus state
> diff --git a/mm/migrate.c b/mm/migrate.c
> index d7db4fd97d8e..81f9a36c754d 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1278,7 +1278,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
> * folio_mapping() set, hugetlbfs specific move page routine will not
> * be called and we could leak usage counts for subpools.
> */
> - if (hugetlb_page_subpool(hpage) && !folio_mapping(src)) {
> + if (hugetlb_folio_subpool(src) && !folio_mapping(src)) {
> rc = -EBUSY;
> goto out_unlock;
> }
> @@ -1328,7 +1328,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
> put_anon_vma(anon_vma);
> 
> if (rc == MIGRATEPAGE_SUCCESS) {
> - move_hugetlb_state(hpage, new_hpage, reason);
> + move_hugetlb_state(src, dst, reason);
> put_new_page = NULL;
> }
> 
> -- 
> 2.31.1
> 
>