Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / page-isolation.h

diff --git a/kernel/include/linux/page-isolation.h b/kernel/include/linux/page-isolation.h
new file mode 100644 (file)
index 0000000..2dc1e16
--- /dev/null
+++ b/kernel/include/linux/page-isolation.h
@@ -0,0 +1,76 @@
+#ifndef __LINUX_PAGEISOLATION_H
+#define __LINUX_PAGEISOLATION_H
+
+#ifdef CONFIG_MEMORY_ISOLATION
+static inline bool has_isolate_pageblock(struct zone *zone)
+{
+       return zone->nr_isolate_pageblock;
+}
+static inline bool is_migrate_isolate_page(struct page *page)
+{
+       return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
+}
+static inline bool is_migrate_isolate(int migratetype)
+{
+       return migratetype == MIGRATE_ISOLATE;
+}
+#else
+static inline bool has_isolate_pageblock(struct zone *zone)
+{
+       return false;
+}
+static inline bool is_migrate_isolate_page(struct page *page)
+{
+       return false;
+}
+static inline bool is_migrate_isolate(int migratetype)
+{
+       return false;
+}
+#endif
+
+bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
+                        bool skip_hwpoisoned_pages);
+void set_pageblock_migratetype(struct page *page, int migratetype);
+int move_freepages_block(struct zone *zone, struct page *page,
+                               int migratetype);
+int move_freepages(struct zone *zone,
+                         struct page *start_page, struct page *end_page,
+                         int migratetype);
+
+/*
+ * Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE.
+ * If specified range includes migrate types other than MOVABLE or CMA,
+ * this will fail with -EBUSY.
+ *
+ * For isolating all pages in the range finally, the caller have to
+ * free all pages in the range. test_page_isolated() can be used for
+ * test it.
+ */
+int
+start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
+                        unsigned migratetype, bool skip_hwpoisoned_pages);
+
+/*
+ * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
+ * target range is [start_pfn, end_pfn)
+ */
+int
+undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
+                       unsigned migratetype);
+
+/*
+ * Test all pages in [start_pfn, end_pfn) are isolated or not.
+ */
+int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
+                       bool skip_hwpoisoned_pages);
+
+/*
+ * Internal functions. Changes pageblock's migrate type.
+ */
+int set_migratetype_isolate(struct page *page, bool skip_hwpoisoned_pages);
+void unset_migratetype_isolate(struct page *page, unsigned migratetype);
+struct page *alloc_migrate_target(struct page *page, unsigned long private,
+                               int **resultp);
+
+#endif