On Thu, 25 Oct 2012, Minchan Kim wrote:

 #endif
+	/*
+	 * True if page in this vma is reclaimed.

What does that mean? All pages in the vma have been cleared out?

+	TTU_IGNORE_VOLATILE = (1 << 11),/* ignore volatile */
 };
 #define TTU_ACTION(x) ((x) & TTU_ACTION_MASK)

 int try_to_unmap(struct page *, enum ttu_flags flags);
 int try_to_unmap_one(struct page *, struct vm_area_struct *,
-			unsigned long address, enum ttu_flags flags);
+			unsigned long address, enum ttu_flags flags,
+			bool *is_volatile);

You already pass a vma pointer in. Why do you need to pass a
volatile flag in? Looks like unecessary churn.

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