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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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include/linux/mm.h
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@@ -83,6 +83,7 @@ extern unsigned int kobjsize(const void *objp);
#define VM_GROWSUP 0x00000200
#else
#define VM_GROWSUP 0x00000000
#define VM_NOHUGEPAGE 0x00000200 /* MADV_NOHUGEPAGE marked this vma */
#endif
#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */