linux-kernel - [PATCH 2/5] mm: skip huge zero page in MADV

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Date:	Mon, 19 Oct 2015 15:31:44 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Vlastimil Babka <vbabka@...e.cz>,
	Minchan Kim <minchan@...nel.org>
Subject: [PATCH 2/5] mm: skip huge zero page in MADV_FREE

It is pointless to mark huge zero page as freeable.
Let's skip it.

Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 mm/huge_memory.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f1de4ce583a6..269ed99493f0 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1542,6 +1542,9 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 		struct page *page;
 		pmd_t orig_pmd;
 
+		if (is_huge_zero_pmd(*pmd))
+			goto out;
+
 		orig_pmd = pmdp_huge_get_and_clear(mm, addr, pmd);
 
 		/* No hugepage in swapcache */
@@ -1553,6 +1556,7 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 
 		set_pmd_at(mm, addr, pmd, orig_pmd);
 		tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
+out:
 		spin_unlock(ptl);
 		ret = 0;
 	}
-- 
1.9.1

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