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Commit 9e81130b authored by Hillf Danton's avatar Hillf Danton Committed by Linus Torvalds
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mm: hugetlb: bail out unmapping after serving reference page 



When unmapping a given VM range, we could bail out if a reference page is
supplied and is unmapped, which is a minor optimization.

Signed-off-by: default avatarHillf Danton <dhillf@gmail.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fcf4d821

mm/hugetlb.c

+4 −0
Original line number Diff line number Diff line
@@ -2280,6 +2280,10 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, 
		if (pte_dirty(pte))

			set_page_dirty(page);

		list_add(&page->lru, &page_list);



		/* Bail out after unmapping reference page if supplied */

		if (ref_page)

			break;

	}

	flush_tlb_range(vma, start, end);

	spin_unlock(&mm->page_table_lock);