perf: minor improvements

src/migration/migration.hpp

@@ -280,7 +280,7 @@ namespace migration {
 	static auto pages_node_map(const std::vector<samples::pebs> & samples) -> umap<addr_t, node_t> {
 		static size_t last_map_size = 0;
 
-		umap<pid_t, set<addr_t>> pid_pages_map;
+		umap<pid_t, uset<addr_t>> pid_pages_map;
 
 		for (const auto & sample : samples) {
 			if (sample.is_mem_sample()) {

src/migration/performance/mempages_table.hpp

@@ -215,7 +215,7 @@ namespace performance {
 
 	class mempages_table {
 	private:
-		map<addr_t, memtable_details::row> table_ = {};
+		fast_umap<addr_t, memtable_details::row> table_ = {};
 
 		req_t accesses_   = 0;
 		lat_t av_latency_ = samples::minimum_latency;
@@ -262,8 +262,11 @@ namespace performance {
 
 		inline void clear_it() {
 			if (memory_info::fake_thp_enabled()) {
+				const auto LAST_SIZE = table_.size();
 				// Clear the table completely
 				table_.clear();
+				// Preallocate to save some time
+				table_.reserve(LAST_SIZE);
 			} else {
 				// Clear non-valid contents
 				std::set<addr_t> to_remove;

src/samples/samples.cpp

@@ -10,5 +10,5 @@
 #include "samples.hpp"
 
 namespace samples {
-	set<pid_t> PIDs_to_filter;
+	uset<pid_t> PIDs_to_filter;
 } // namespace samples
\ No newline at end of file

src/samples/samples.hpp

@@ -87,7 +87,7 @@ namespace samples {
 		}
 	}
 
-	extern set<pid_t> PIDs_to_filter;
+	extern uset<pid_t> PIDs_to_filter;
 
 	static constexpr bool filter_by_PIDs = true;