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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
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')
-rw-r--r--include/linux/huge_mm.h14
-rw-r--r--include/linux/khugepaged.h7
-rw-r--r--include/linux/mm.h1
3 files changed, 13 insertions, 9 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 9b48c24df26..a8b7e42d19e 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -52,10 +52,12 @@ extern pmd_t *page_check_address_pmd(struct page *page,
#define HPAGE_PMD_SIZE HPAGE_SIZE
#define transparent_hugepage_enabled(__vma) \
- (transparent_hugepage_flags & (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
- (transparent_hugepage_flags & \
- (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
- (__vma)->vm_flags & VM_HUGEPAGE))
+ ((transparent_hugepage_flags & \
+ (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
+ (transparent_hugepage_flags & \
+ (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
+ ((__vma)->vm_flags & VM_HUGEPAGE))) && \
+ !((__vma)->vm_flags & VM_NOHUGEPAGE))
#define transparent_hugepage_defrag(__vma) \
((transparent_hugepage_flags & \
(1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
@@ -103,7 +105,7 @@ extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
#if HPAGE_PMD_ORDER > MAX_ORDER
#error "hugepages can't be allocated by the buddy allocator"
#endif
-extern int hugepage_madvise(unsigned long *vm_flags);
+extern int hugepage_madvise(unsigned long *vm_flags, int advice);
extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
unsigned long start,
unsigned long end,
@@ -141,7 +143,7 @@ static inline int split_huge_page(struct page *page)
do { } while (0)
#define wait_split_huge_page(__anon_vma, __pmd) \
do { } while (0)
-static inline int hugepage_madvise(unsigned long *vm_flags)
+static inline int hugepage_madvise(unsigned long *vm_flags, int advice)
{
BUG();
return 0;
diff --git a/include/linux/khugepaged.h b/include/linux/khugepaged.h
index 552f3184756..6b394f0b514 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;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index ce97a2bb0b1..956a35532f4 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -83,6 +83,7 @@ extern unsigned int kobjsize(const void *objp);
#define VM_GROWSUP 0x00000200
#else
#define VM_GROWSUP 0x00000000
+#define VM_NOHUGEPAGE 0x00000200 /* MADV_NOHUGEPAGE marked this vma */
#endif
#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */