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>
diff --git a/mm/madvise.c b/mm/madvise.c
index ecde40a..bbac126 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -72,7 +72,8 @@
goto out;
break;
case MADV_HUGEPAGE:
- error = hugepage_madvise(&new_flags);
+ case MADV_NOHUGEPAGE:
+ error = hugepage_madvise(&new_flags, behavior);
if (error)
goto out;
break;
@@ -290,6 +291,7 @@
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
case MADV_HUGEPAGE:
+ case MADV_NOHUGEPAGE:
#endif
return 1;