Messages in this thread Patch in this message | | | From | Vlastimil Babka <> | Subject | [PATCH] mm/hugetlb: remove unnecessary memory fetch in PageHeadHuge() | Date | Wed, 11 Mar 2020 18:24:40 +0100 |
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Commit f1e61557f023 ("mm: pack compound_dtor and compound_order into one word in struct page") changed compound_dtor from a pointer to an array index in order to pack it. To check if page has the hugeltbfs compound_dtor, we can just compare the index directly without fetching the function pointer. Said commit did that with PageHuge() and we can do the same with PageHeadHuge() to make the code a bit smaller and faster.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- mm/hugetlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index dd8737a94bec..ba1ca452aa7f 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1313,7 +1313,7 @@ int PageHeadHuge(struct page *page_head) if (!PageHead(page_head)) return 0; - return get_compound_page_dtor(page_head) == free_huge_page; + return page_head[1].compound_dtor == HUGETLB_PAGE_DTOR; } pgoff_t __basepage_index(struct page *page) -- 2.25.1
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