Mechanism to detect low memory and cast out older page

Change-Id: Icce8e01f3d1cd2942f2b9ff802993da0441535ee
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/344
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>
Reviewed-by: Douglas R. Gilbert <dgilbert@us.ibm.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/include/kernel/block.H b/src/include/kernel/block.H
index 2421f97f9..88c6664c2 100644
--- a/src/include/kernel/block.H
+++ b/src/include/kernel/block.H
@@ -156,6 +156,20 @@ class Block
         void updateRefCount( uint64_t i_vaddr,
 			     PageTableManager::UsageStats_t i_stats );
 
+        /**
+         * @brief Cast out older phyiscal memory pages
+         * @param[in] i_type - Castout contraint @see VmmManager::castOutPages()
+         * @return number of pages cast out
+         */
+        size_t castOutPages(uint64_t i_type);
+
+        /**
+         * @brief Evict a memory page
+         * @param[in] i_pte shadow page table entry
+         * @return true of page was evicted
+         */
+        bool evictPage(ShadowPTE* i_pte);
+
         friend class Segment;
         friend class BaseSegment;
         friend class StackSegment;