[Linux] Implement KSM Kernel Samepage Merging with Maps (#4601)

* KSM work

* Windows fixes

* Add KSM logging, cleanup

* Cleanup raycast logging

world/cli/test.cpp

@@ -1,6 +1,8 @@
 #include <cereal/archives/json.hpp>
 #include <cereal/types/vector.hpp>
+#include <iomanip>
 #include "../../common/events/player_events.h"
+#include "../../common/memory/ksm.hpp"
 
 void WorldserverCLI::TestCommand(int argc, char **argv, argh::parser &cmd, std::string &description)
 {
@@ -10,5 +12,21 @@ void WorldserverCLI::TestCommand(int argc, char **argv, argh::parser &cmd, std::
 		return;
 	}
 
-	
+	void* start_marker = KSM::MarkHeapStart();
+	std::cout << "Start marker: " << start_marker << "\n";
+
+	std::vector<std::string> vec = {};
+	for (int i = 0; i < 100000; i++) {
+		vec.push_back("Some random string");
+	}
+
+	// Measure allocated memory size
+	size_t allocated_size = KSM::MeasureHeapUsage(start_marker);
+	// Convert to MB as a float and output with precision
+	double allocated_size_mb = static_cast<double>(allocated_size) / (1024 * 1024);
+	std::cout << std::fixed << std::setprecision(3)
+			  << "Allocated size: " << allocated_size_mb << " MB\n";
+
+	// Mark memory for KSM
+	KSM::MarkMemoryForKSM(start_marker, allocated_size);
 }