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thp: madvise(MADV_NOHUGEPAGE)

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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>
This commit is contained in:
Andrea Arcangeli
2011-01-13 15:47:17 -08:00
committed by Linus Torvalds
parent 1ddd6db43a
commit a664b2d855
5 changed files with 46 additions and 21 deletions
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4
mm/madvise.c
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@@ -72,7 +72,8 @@ static long madvise_behavior(struct vm_area_struct * vma,
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 @@ madvise_behavior_valid(int behavior)
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
case MADV_HUGEPAGE:
case MADV_NOHUGEPAGE:
#endif
return 1;