The patch titled
Subject: mm: free compound page with correct order
has been added to the -mm tree. Its filename is
mm-free-compound-page-with-correct-order.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-free-compound-page-with-correct-order.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-free-compound-page-with-correct-order.patch
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------------------------------------------------------
From: Yu Zhao <yuzhao@xxxxxxxxxx>
Subject: mm: free compound page with correct order
Compound page should be freed by put_page() or free_pages() with correct
order. Not doing so will cause tail pages leaked.
The compound order can be obtained by compound_order() or use
HPAGE_PMD_ORDER in our case. Some people would argue the latter is faster
but I prefer the former which is more general.
Fixes: 97ae17497e99 ("thp: implement refcounting for huge zero page")
Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Bob Liu <lliubbo@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [3.8+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN mm/huge_memory.c~mm-free-compound-page-with-correct-order mm/huge_memory.c
--- a/mm/huge_memory.c~mm-free-compound-page-with-correct-order
+++ a/mm/huge_memory.c
@@ -200,7 +200,7 @@ retry:
preempt_disable();
if (cmpxchg(&huge_zero_page, NULL, zero_page)) {
preempt_enable();
- __free_page(zero_page);
+ __free_pages(zero_page, compound_order(zero_page));
goto retry;
}
@@ -232,7 +232,7 @@ static unsigned long shrink_huge_zero_pa
if (atomic_cmpxchg(&huge_zero_refcount, 1, 0) == 1) {
struct page *zero_page = xchg(&huge_zero_page, NULL);
BUG_ON(zero_page == NULL);
- __free_page(zero_page);
+ __free_pages(zero_page, compound_order(zero_page));
return HPAGE_PMD_NR;
}
_
Patches currently in -mm which might be from yuzhao@xxxxxxxxxx are
mm-free-compound-page-with-correct-order.patch
mm-verify-compound-order-when-freeing-a-page.patch
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