Move RcuVector and relevant support classes to vespalib

Having RCU support available across all our C++ modules open up
new opportunities for optimizations.

This changes the following:
- `RcuVector` moved from `searchlib` to `vespalib`
- `MemoryUsage` moved from `searchlib` to `vespalib`
- Introduce a simplified, more generic `GrowStrategy` in `vespalib`
  used by the moved `RcuVector` which does not have any notion of
  documents. Existing searchlib `GrowStrategy` gets a simple function
  to convert to this generic strategy.

2 files changed, 3 insertions, 3 deletions

diff --git a/searchcorespi/src/vespa/searchcorespi/index/imemoryindex.h b/searchcorespi/src/vespa/searchcorespi/index/imemoryindex.h
index f7eed750842..e25a3ef7b64 100644
--- a/searchcorespi/src/vespa/searchcorespi/index/imemoryindex.h
+++ b/searchcorespi/src/vespa/searchcorespi/index/imemoryindex.h
@@ -5,7 +5,7 @@
 #include <vespa/searchcommon/common/schema.h>
 #include <vespa/searchcorespi/index/indexsearchable.h>
 #include <vespa/searchlib/common/serialnum.h>
-#include <vespa/searchlib/util/memoryusage.h>
+#include <vespa/vespalib/util/memoryusage.h>
 #include <vespa/vespalib/stllike/string.h>
 
 namespace search
@@ -35,7 +35,7 @@ struct IMemoryIndex : public searchcorespi::IndexSearchable {
     /**
      * Returns the memory usage of this memory index.
      */
-    virtual search::MemoryUsage getMemoryUsage() const = 0;
+    virtual vespalib::MemoryUsage getMemoryUsage() const = 0;
 
     /**
      * Returns the memory usage of an empty version of this memory index.
diff --git a/searchcorespi/src/vespa/searchcorespi/index/index_manager_explorer.cpp b/searchcorespi/src/vespa/searchcorespi/index/index_manager_explorer.cpp
index 4764aeef8ee..63a63b0159d 100644
--- a/searchcorespi/src/vespa/searchcorespi/index/index_manager_explorer.cpp
+++ b/searchcorespi/src/vespa/searchcorespi/index/index_manager_explorer.cpp
@@ -26,7 +26,7 @@ insertDiskIndex(Cursor &arrayCursor, const DiskIndexStats &diskIndex)
 }
 
 void
-insertMemoryUsage(Cursor &object, const search::MemoryUsage &usage)
+insertMemoryUsage(Cursor &object, const vespalib::MemoryUsage &usage)
 {
     Cursor &memory = object.setObject("memoryUsage");
     memory.setLong("allocatedBytes", usage.allocatedBytes());