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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-14 02:46:55 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-14 04:32:42 +0300
commit0af4e98b6b095c74588af04872f83d333c958c32 (patch)
tree56b1965482470219a8cf11b7e7c875ae91bff46e /include
parentf66055ab6fb9731dbfce320c5202ef4441b5d77f (diff)
downloadlinux-0af4e98b6b095c74588af04872f83d333c958c32.tar.xz
thp: madvise(MADV_HUGEPAGE)
Add madvise MADV_HUGEPAGE to mark regions that are 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> Acked-by: Rik van Riel <riel@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.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 9301824c7491..d9ab70d776e2 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -97,6 +97,7 @@ 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);
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
#define HPAGE_PMD_MASK ({ BUG(); 0; })
@@ -113,6 +114,11 @@ 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)
+{
+ BUG();
+ return 0;
+}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif /* _LINUX_HUGE_MM_H */