linux-kernel - [RFC PATCHv2 2/2] Change khugepaged to respect MMF_THP

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Date:	Thu, 16 Jan 2014 15:01:44 -0600
From:	Alex Thorlton <athorlton@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Alex Thorlton <athorlton@....com>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rik van Riel <riel@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andy Lutomirski <luto@...capital.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: [RFC PATCHv2 2/2] Change khugepaged to respect MMF_THP_DISABLE flag

This just adds a simple check to get khugepaged to behave
appropriately when MMF_THP_DISABLE is set.

Signed-off-by: Alex Thorlton <athorlton@....com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Kees Cook <keescook@...omium.org>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: linux-kernel@...r.kernel.org

---
 mm/huge_memory.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 9c0b172..3cfe6b4 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2049,7 +2049,8 @@ static void insert_to_mm_slots_hash(struct mm_struct *mm,

 static inline int khugepaged_test_exit(struct mm_struct *mm)
 {
-	return atomic_read(&mm->mm_users) == 0;
+	return atomic_read(&mm->mm_users) == 0 ||
+	       (mm->flags & MMF_THP_DISABLE_MASK);
 }

 int __khugepaged_enter(struct mm_struct *mm)
-- 
1.7.12.4

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