Adding a basic interface and implementation to the Segment/Block

path to update the LRU statistics when the PageTableManager code
clears the reference bit.  This is not meant to be a complete
implementation (different Task is open for that).

This is Task 3400.

Change-Id: If67efd16ead6f68a74f5f5a698013c1b852864d9
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/231
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/include/kernel/segment.H b/src/include/kernel/segment.H
index 05c5c0fdc..d7a4a7547 100644
--- a/src/include/kernel/segment.H
+++ b/src/include/kernel/segment.H
@@ -28,6 +28,7 @@
 
 #include <kernel/task.H>
 #include <errno.h>
+#include <kernel/ptmgr.H>
 
 /** @class Segment
  *  @brief Virtual segment class to handle virtual memory management within
@@ -75,6 +76,19 @@ class Segment
          */
          virtual uint64_t findPhysicalAddress(uint64_t i_vaddr) const { return -EFAULT; };
 
+        /**
+         * @brief Update LRU statistics on the block that owns the address
+         *
+         * @param[in] i_vaddr - Virtual Address of page
+         * @param[in] i_stats - Usage statistics
+         */
+        virtual void updateRefCount( uint64_t i_vaddr,
+				     PageTableManager::UsageStats_t i_stats )
+	{
+	    //default to a NOOP
+	    return;
+	};
+
     protected:
             /** The base address of the segment. */
         const uint64_t iv_baseAddress;