summaryrefslogtreecommitdiffstats
path: root/include/linux/khugepaged.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/khugepaged.h')
-rw-r--r--include/linux/khugepaged.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/include/linux/khugepaged.h b/include/linux/khugepaged.h
new file mode 100644
index 00000000000..6b394f0b514
--- /dev/null
+++ b/include/linux/khugepaged.h
@@ -0,0 +1,67 @@
+#ifndef _LINUX_KHUGEPAGED_H
+#define _LINUX_KHUGEPAGED_H
+
+#include <linux/sched.h> /* MMF_VM_HUGEPAGE */
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+extern int __khugepaged_enter(struct mm_struct *mm);
+extern void __khugepaged_exit(struct mm_struct *mm);
+extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma);
+
+#define khugepaged_enabled() \
+ (transparent_hugepage_flags & \
+ ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
+ (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
+#define khugepaged_always() \
+ (transparent_hugepage_flags & \
+ (1<<TRANSPARENT_HUGEPAGE_FLAG))
+#define khugepaged_req_madv() \
+ (transparent_hugepage_flags & \
+ (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
+#define khugepaged_defrag() \
+ (transparent_hugepage_flags & \
+ (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
+
+static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
+{
+ if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
+ return __khugepaged_enter(mm);
+ return 0;
+}
+
+static inline void khugepaged_exit(struct mm_struct *mm)
+{
+ if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
+ __khugepaged_exit(mm);
+}
+
+static inline int khugepaged_enter(struct vm_area_struct *vma)
+{
+ if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
+ if ((khugepaged_always() ||
+ (khugepaged_req_madv() &&
+ vma->vm_flags & VM_HUGEPAGE)) &&
+ !(vma->vm_flags & VM_NOHUGEPAGE))
+ if (__khugepaged_enter(vma->vm_mm))
+ return -ENOMEM;
+ return 0;
+}
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
+{
+ return 0;
+}
+static inline void khugepaged_exit(struct mm_struct *mm)
+{
+}
+static inline int khugepaged_enter(struct vm_area_struct *vma)
+{
+ return 0;
+}
+static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma)
+{
+ return 0;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
+#endif /* _LINUX_KHUGEPAGED_H */