linux-kernel - [PATCH] mm: dont call mmu_notifier_invalidate

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Message-ID: <20140528075955.20300.22758.stgit@zurg>
Date:	Wed, 28 May 2014 11:59:55 +0400
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] mm: dont call mmu_notifier_invalidate_page during munlock

try_to_munlock() searches other mlocked vmas, it never unmaps pages.
There is no reason for invalidation because ptes are left unchanged.

Signed-off-by: Konstantin Khlebnikov <koct9i@...il.com>
---
 mm/rmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 9c3e773..75d9d5c 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1225,7 +1225,7 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
 
 out_unmap:
 	pte_unmap_unlock(pte, ptl);
-	if (ret != SWAP_FAIL)
+	if (ret != SWAP_FAIL && TTU_ACTION(flags) != TTU_MUNLOCK)
 		mmu_notifier_invalidate_page(mm, address);
 out:
 	return ret;

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