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>
diff --git a/mm/madvise.c b/mm/madvise.c
index 319528b..ecde40a 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -71,6 +71,11 @@
if (error)
goto out;
break;
+ case MADV_HUGEPAGE:
+ error = hugepage_madvise(&new_flags);
+ if (error)
+ goto out;
+ break;
}
if (new_flags == vma->vm_flags) {
@@ -283,6 +288,9 @@
case MADV_MERGEABLE:
case MADV_UNMERGEABLE:
#endif
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ case MADV_HUGEPAGE:
+#endif
return 1;
default: