Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-2.6

[karo-tx-linux.git] / include / linux / mmu_notifier.h

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index cbfab1e9957d70888bfc6b72fa56d9a136651c6d..cc2e7dfea9d7f6a57661155cb88ca487863e66af 100644 (file)
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -61,6 +61,16 @@ struct mmu_notifier_ops {
                                 struct mm_struct *mm,
                                 unsigned long address);
 
+       /*
+        * test_young is called to check the young/accessed bitflag in
+        * the secondary pte. This is used to know if the page is
+        * frequently used without actually clearing the flag or tearing
+        * down the secondary mapping on the page.
+        */
+       int (*test_young)(struct mmu_notifier *mn,
+                         struct mm_struct *mm,
+                         unsigned long address);
+
        /*
         * change_pte is called in cases that pte mapping to page is changed:
         * for example, when ksm remaps pte to point to a new shared page.
@@ -163,6 +173,8 @@ extern void __mmu_notifier_mm_destroy(struct mm_struct *mm);
 extern void __mmu_notifier_release(struct mm_struct *mm);
 extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
                                          unsigned long address);
+extern int __mmu_notifier_test_young(struct mm_struct *mm,
+                                    unsigned long address);
 extern void __mmu_notifier_change_pte(struct mm_struct *mm,
                                      unsigned long address, pte_t pte);
 extern void __mmu_notifier_invalidate_page(struct mm_struct *mm,
@@ -186,6 +198,14 @@ static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm,
        return 0;
 }
 
+static inline int mmu_notifier_test_young(struct mm_struct *mm,
+                                         unsigned long address)
+{
+       if (mm_has_notifiers(mm))
+               return __mmu_notifier_test_young(mm, address);
+       return 0;
+}
+
 static inline void mmu_notifier_change_pte(struct mm_struct *mm,
                                           unsigned long address, pte_t pte)
 {
@@ -313,6 +333,12 @@ static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm,
        return 0;
 }
 
+static inline int mmu_notifier_test_young(struct mm_struct *mm,
+                                         unsigned long address)
+{
+       return 0;
+}
+
 static inline void mmu_notifier_change_pte(struct mm_struct *mm,
                                           unsigned long address, pte_t pte)
 {