From: Konstantin Khlebnikov <koct9i@gmail.com>
Date: Wed, 4 Jun 2014 23:10:51 +0000 (-0700)
Subject: mm/rmap.c: don't call mmu_notifier_invalidate_page() during munlock
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3d92860f979f725a9c10c2fc26c0415a4332adbf;p=linux-beck.git

mm/rmap.c: don't call mmu_notifier_invalidate_page() during munlock

In its munmap mode, try_to_unmap_one() 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@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/rmap.c b/mm/rmap.c
index e375ce4bd93e..ab74290d185d 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1252,7 +1252,7 @@ static 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;