Christoph Lameter wrote:
Add remove_from_swap
remove_from_swap() allows the restoration of the pte entries that existed
before page migration occurred for anonymous pages by walking the reverse
maps. This reduces swap use and establishes regular pte's without the need
for page faults.
in migrate_page_copy()
==
ClearPageSwapCache(page);
ClearPageActive(page);
ClearPagePrivate(page);
set_page_private(page, 0);
page->mapping = NULL;
==
page->mapping turns to be NULL, when migration success.
> + if (newpage) {
> /* Successful migration. Return new page to LRU */
> + remove_from_swap(page);
> move_to_lru(newpage);
> -
When success, remove_from_swap(page) is called.
+#ifdef CONFIG_MIGRATION
+/*
+ * Remove an anonymous page from swap replacing the swap pte's
+ * through real pte's pointing to valid pages.
+ */
+void remove_from_swap(struct page *page)
+{
+ struct anon_vma *anon_vma;
+ struct vm_area_struct *vma;
+
+ if (!PageAnon(page))
+ return;
+
PageAnon(page) always 0.
remove_from_swap(newpage) is sane ?
-- Kame
-
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