fix(libkernel): omit inactive wait trace sites

core/libs/prx/libkernel/CMakeLists.txt

@@ -238,6 +238,20 @@ if(BUILD_TESTING)
         set_tests_properties(guest_posix_named_sem PROPERTIES ENVIRONMENT_MODIFICATION
             "PATH=path_list_prepend:$<TARGET_FILE_DIR:libkernel>")
     endif()
+    add_test_executable(guest_wait_trace_tests ${LIBS_INCLUDE_DIR}/tests/GuestWaitTrace.cpp)
+    target_include_directories(guest_wait_trace_tests PRIVATE ${LIBS_INCLUDE_DIR})
+    target_link_libraries(guest_wait_trace_tests PRIVATE libkernel libc)
+    configure_windows_unwind(guest_wait_trace_tests)
+    add_test(NAME guest_wait_trace COMMAND guest_wait_trace_tests)
+    set_tests_properties(guest_wait_trace PROPERTIES
+        ENVIRONMENT "APS5_TRACE_WAITS=1"
+        PASS_REGULAR_EXPRESSION "wait_trace_active_zero[^|]*x1"
+        FAIL_REGULAR_EXPRESSION "wait_trace_inactive[^|]*x0"
+        TIMEOUT 30)
+    if(WIN32)
+        set_tests_properties(guest_wait_trace PROPERTIES ENVIRONMENT_MODIFICATION
+            "PATH=path_list_prepend:$<TARGET_FILE_DIR:libkernel>")
+    endif()
     add_test_executable(guest_process_time_tests ${LIBS_INCLUDE_DIR}/tests/GuestProcessTime.cpp)
     target_include_directories(guest_process_time_tests PRIVATE ${LIBS_INCLUDE_DIR})
     target_link_libraries(guest_process_time_tests PRIVATE libkernel libc)

core/libs/prx/libkernel/Time/Time.cpp

@@ -324,6 +324,7 @@ void KernelTraceWait_nid_postfix(const char* kind, const void* caller, std::uint
     if (now - lastReport < 3000000000ULL) return;
     lastReport = now;
     std::vector<std::pair<std::string, Site>> hot(sites.begin(), sites.end());
+    std::erase_if(hot, [](const auto& item) { return item.second.calls == 0; });
     std::sort(hot.begin(), hot.end(), [](const auto& a, const auto& b) { return a.second.nanos > b.second.nanos; });
     std::fprintf(stderr, "[waits]");
     for (std::size_t i = 0; i < hot.size() && i < 8; ++i) {

core/libs/tests/GuestWaitTrace.cpp

@@ -0,0 +1,16 @@
+#include "prx/libkernel/Time/include/Time.hpp"
+#include <array>
+#include <chrono>
+#include <thread>
+
+int main() {
+    const std::array<int, 8> inactive{};
+    const int active = 0;
+    const int zeroDuration = 0;
+    for (const auto& site : inactive) KernelTraceWait_nid_postfix("wait_trace_inactive", &site, 1000000u, false);
+    std::this_thread::sleep_for(std::chrono::milliseconds(3100));
+    KernelTraceWait_nid_postfix("wait_trace_active", &active, 2000000u, false);
+    std::this_thread::sleep_for(std::chrono::milliseconds(3100));
+    KernelTraceWait_nid_postfix("wait_trace_active_zero", &zeroDuration, 0u, false);
+    return 0;
+}