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thp: madvise(MADV_HUGEPAGE)

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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>
This commit is contained in:
Andrea Arcangeli
2011-01-13 15:46:55 -08:00
committed by Linus Torvalds
parent f66055ab6f
commit 0af4e98b6b
3 changed files with 30 additions and 0 deletions
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16
mm/huge_memory.c
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@@ -896,6 +896,22 @@ out:
return ret;
}
int hugepage_madvise(unsigned long *vm_flags)
{
/*
* Be somewhat over-protective like KSM for now!
*/
if (*vm_flags & (VM_HUGEPAGE | VM_SHARED | VM_MAYSHARE |
VM_PFNMAP | VM_IO | VM_DONTEXPAND |
VM_RESERVED | VM_HUGETLB | VM_INSERTPAGE |
VM_MIXEDMAP | VM_SAO))
return -EINVAL;
*vm_flags |= VM_HUGEPAGE;
return 0;
}
void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd)
{
struct page *page;