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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-13 15:47:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:47 -0800
commita664b2d8555c659127bf8fe049a58449d394a707 (patch)
tree14771f4ab93a9dda98174f21e0361a77e2aebfa6 /include/linux/khugepaged.h
parent1ddd6db43a08cba56c7ee920800980862086f1c3 (diff)
thp: madvise(MADV_NOHUGEPAGE)
Add madvise MADV_NOHUGEPAGE to mark regions that are not important to be hugepage backed. Return -EINVAL if the vma is not of an anonymous type, or the feature isn't built into the kernel. Never silently return success. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/khugepaged.h')
-rw-r--r--include/linux/khugepaged.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/khugepaged.h b/include/linux/khugepaged.h
index 552f3184756c..6b394f0b5148 100644
--- a/include/linux/khugepaged.h
+++ b/include/linux/khugepaged.h
@@ -38,9 +38,10 @@ static inline void khugepaged_exit(struct mm_struct *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))
+ 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;