On 2022/4/29 19:36, Muchun Song wrote:
> On Mon, Apr 25, 2022 at 09:27:22PM +0800, Miaohe Lin wrote:
>> We might fail to isolate huge page due to e.g. the page is under migration
>> which cleared HPageMigratable. So we should return -EBUSY in this case
>> rather than always return 1 which could confuse the user. Also we make
>> the prototype of isolate_huge_page consistent with isolate_lru_page to
>> improve the readability.
>>
>> Fixes: e8db67eb0ded ("mm: migrate: move_pages() supports thp migration")
>> Suggested-by: Huang Ying <ying.huang@xxxxxxxxx>
>> Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
>> ---
>> include/linux/hugetlb.h | 6 +++---
>> mm/gup.c | 2 +-
>> mm/hugetlb.c | 11 +++++------
>> mm/memory-failure.c | 2 +-
>> mm/mempolicy.c | 2 +-
>> mm/migrate.c | 5 +++--
>> 6 files changed, 14 insertions(+), 14 deletions(-)
>>
>> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
>> index 04f0186b089b..306d6ef3fa22 100644
>> --- a/include/linux/hugetlb.h
>> +++ b/include/linux/hugetlb.h
>> @@ -170,7 +170,7 @@ bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
>> vm_flags_t vm_flags);
>> long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
>> long freed);
>> -bool isolate_huge_page(struct page *page, struct list_head *list);
>> +int isolate_huge_page(struct page *page, struct list_head *list);
>> int get_hwpoison_huge_page(struct page *page, bool *hugetlb);
>> int get_huge_page_for_hwpoison(unsigned long pfn, int flags);
>> void putback_active_hugepage(struct page *page);
>> @@ -376,9 +376,9 @@ static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
>> return NULL;
>> }
>>
>> -static inline bool isolate_huge_page(struct page *page, struct list_head *list)
>> +static inline int isolate_huge_page(struct page *page, struct list_head *list)
>
> Since you already touched all the call sites, how about renaming this
> to hugetlb_isolate()? I've always felt that huge_page is not a
> straightforward and clear name since we also have another type of
> huge page (THP). I think hugetlb is more specific.
>
Sorry for late respond. This suggestion looks good to me. But is isolate_hugetlb more suitable?
This could make it more consistent with isolate_lru_page? What do you think?
Thanks!
> Thanks.
>
> .
>
