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| author | Hillf Danton <dhillf@gmail.com> | 2012-03-21 16:34:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-21 17:54:57 -0700 |
| commit | 9e81130b7ce23050335b1197bb51743517b5b9d0 (patch) | |
| tree | 6a359131ad2c36ca9e50f0c96a17ef755ad7e168 /mm/hugetlb.c | |
| parent | fcf4d8212a8f38334679e82ff14532b908b4b451 (diff) | |
| download | lwn-9e81130b7ce23050335b1197bb51743517b5b9d0.tar.gz lwn-9e81130b7ce23050335b1197bb51743517b5b9d0.zip | |
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: Hillf 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index afe3e1ff919b..62f9fada4d6d 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -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); |