Add CompactionStrategy methods to determine if compaction should be performed.

1 files changed, 14 insertions, 0 deletions

diff --git a/searchcommon/src/vespa/searchcommon/common/compaction_strategy.h b/searchcommon/src/vespa/searchcommon/common/compaction_strategy.h
index 8a9b94f3af8..65a7b5a276c 100644
--- a/searchcommon/src/vespa/searchcommon/common/compaction_strategy.h
+++ b/searchcommon/src/vespa/searchcommon/common/compaction_strategy.h
@@ -32,6 +32,20 @@ public:
             _maxDeadAddressSpaceRatio == rhs._maxDeadAddressSpaceRatio;
     }
     bool operator!=(const CompactionStrategy & rhs) const { return !(operator==(rhs)); }
+
+    static constexpr size_t DEAD_BYTES_SLACK = 0x10000u;
+
+    bool should_compact_memory(size_t used_bytes, size_t dead_bytes) const {
+        return ((dead_bytes >= DEAD_BYTES_SLACK) &&
+                (dead_bytes > used_bytes * getMaxDeadBytesRatio()));
+    }
+    
+    static constexpr size_t DEAD_ADDRESS_SPACE_SLACK = 0x10000u;
+    
+    bool should_compact_address_space(size_t used_address_space, size_t dead_address_space) const {
+        return ((dead_address_space >= DEAD_ADDRESS_SPACE_SLACK) &&
+                (dead_address_space > used_address_space * getMaxDeadAddressSpaceRatio()));
+    }
 };
 
 std::ostream& operator<<(std::ostream& os, const CompactionStrategy& compaction_strategy);