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, 21 insertions, 0 deletions

diff --git a/src/kernel/segmentmgr.C b/src/kernel/segmentmgr.C
index 3f43db965..c52b4de04 100644
--- a/src/kernel/segmentmgr.C
+++ b/src/kernel/segmentmgr.C
@@ -49,6 +49,12 @@ uint64_t SegmentManager::findPhysicalAddress(uint64_t i_vaddr)
     return Singleton<SegmentManager>::instance()._findPhysicalAddress(i_vaddr);
 }
 
+void SegmentManager::updateRefCount( uint64_t i_vaddr,
+				     PageTableManager::UsageStats_t i_stats )
+{
+    Singleton<SegmentManager>::instance()._updateRefCount(i_vaddr,i_stats);
+}
+
 bool SegmentManager::_handlePageFault(task_t* i_task, uint64_t i_addr)
 {
     size_t segId = getSegmentIdFromAddress(i_addr);
@@ -112,3 +118,18 @@ uint64_t SegmentManager::_findPhysicalAddress(uint64_t i_vaddr) const
     return paddr;
 }
 
+void SegmentManager::_updateRefCount( uint64_t i_vaddr,
+				      PageTableManager::UsageStats_t i_stats )
+{
+    // This constant should come from page manager.  Segment size.
+    const size_t SLBE_s = 40;
+
+    // Get segment ID from effective address.
+    size_t segId = i_vaddr >> SLBE_s;
+
+    // Call contained segment object to update the reference count
+    if ((segId < MAX_SEGMENTS) && (NULL != iv_segments[segId]))
+    {
+        iv_segments[segId]->updateRefCount( i_vaddr, i_stats );
+    }
+}