8347734: Turning off PerfData logging doesn't work

src/hotspot/share/logging/logConfiguration.cpp

@@ -336,11 +336,9 @@ void LogConfiguration::disable_logging() {
   notify_update_listeners();
 }
 
-void LogConfiguration::configure_stdout(LogLevelType level, int exact_match, ...) {
+LogSelectionList LogConfiguration::create_selection_list(LogLevelType level, int exact_match, va_list ap) {
   size_t i;
-  va_list ap;
   LogTagType tags[LogTag::MaxTags];
-  va_start(ap, exact_match);
   for (i = 0; i < LogTag::MaxTags; i++) {
     LogTagType tag = static_cast<LogTagType>(va_arg(ap, int));
     tags[i] = tag;
@@ -351,12 +349,32 @@ void LogConfiguration::configure_stdout(LogLevelType level, int exact_match, ...
   }
   assert(i < LogTag::MaxTags || static_cast<LogTagType>(va_arg(ap, int)) == LogTag::__NO_TAG,
          "Too many tags specified! Can only have up to %zu tags in a tag set.", LogTag::MaxTags);
-  va_end(ap);
 
   LogSelection selection(tags, !exact_match, level);
   assert(selection.tag_sets_selected() > 0,
-         "configure_stdout() called with invalid/non-existing log selection");
-  LogSelectionList list(selection);
+         "create_selection_list() called with invalid/non-existing log selection");
+  return LogSelectionList(selection);
+}
+
+void LogConfiguration::disable_tags(int exact_match, ...) {
+  va_list ap;
+  va_start(ap, exact_match);
+  LogSelectionList list = create_selection_list(LogLevel::Off, exact_match, ap);
+  va_end(ap);
+
+  // Apply configuration to all outputs, with the same decorators as before.
+  ConfigurationLock cl;
+  for (size_t i = 0; i < _n_outputs; i++) {
+    configure_output(i, list, _outputs[i]->decorators());
+  }
+  notify_update_listeners();
+}
+
+void LogConfiguration::configure_stdout(LogLevelType level, int exact_match, ...) {
+  va_list ap;
+  va_start(ap, exact_match);
+  LogSelectionList list = create_selection_list(level, exact_match, ap);
+  va_end(ap);
 
   // Apply configuration to stdout (output #0), with the same decorators as before.
   ConfigurationLock cl;

src/hotspot/share/logging/logConfiguration.hpp

@@ -97,6 +97,8 @@ class LogConfiguration : public AllStatic {
   static void describe_available(outputStream* out);
   static void describe_current_configuration(outputStream* out);
 
+  // Create a LogSelectionList given a level and a set of tags
+  static LogSelectionList create_selection_list(LogLevelType level, int exact_match, va_list ap);
 
  public:
   // Initialization and finalization of log configuration, to be run at vm startup and shutdown respectively.
@@ -109,6 +111,13 @@ class LogConfiguration : public AllStatic {
   // Disable all logging, equivalent to -Xlog:disable.
   static void disable_logging();
 
+  // Disables logging on all outputs for the given tags.
+  // If exact_match is true, only tagsets with precisely the specified tags will be disabled
+  // (exact_match=false is the same as "-Xlog:<tags>*=off", and exact_match=true is "-Xlog:<tags>=off").
+  // Tags should be specified using the LOG_TAGS macro, e.g.
+  // LogConfiguration::disable_tags(<true/false>, LOG_TAGS(<tags>));
+  static void disable_tags(int exact_match, ...);
+
   // Configures logging on stdout for the given tags and level combination.
   // Intended for mappings between -XX: flags and Unified Logging configuration.
   // If exact_match is true, only tagsets with precisely the specified tags will be configured

src/hotspot/share/runtime/arguments.cpp

@@ -3800,7 +3800,8 @@ jint Arguments::apply_ergo() {
   if (log_is_enabled(Info, perf, class, link)) {
     if (!UsePerfData) {
       warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
-      LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
+      LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
+      assert(!log_is_enabled(Info, perf, class, link), "sanity");
     }
   }
 

test/hotspot/gtest/logging/test_logConfiguration.cpp

@@ -216,6 +216,32 @@ TEST_VM_F(LogConfigurationTest, disable_output) {
   }
 }
 
+TEST_VM_F(LogConfigurationTest, disable_tags) {
+  set_log_config("stdout", "logging*=info");
+  set_log_config(TestLogFileName, "logging*=info");
+
+  EXPECT_TRUE(log_is_enabled(Info, logging, gc));
+  LogConfiguration::disable_tags(true, LOG_TAGS(logging, gc));
+  EXPECT_FALSE(log_is_enabled(Info, logging, gc));
+  EXPECT_TRUE(log_is_enabled(Info, logging));
+
+  set_log_config("stdout", "logging*=info");
+  set_log_config(TestLogFileName, "logging*=info");
+
+  EXPECT_TRUE(log_is_enabled(Info, logging));
+  LogConfiguration::disable_tags(true, LOG_TAGS(logging));
+  EXPECT_TRUE(log_is_enabled(Info, logging, gc));
+  EXPECT_FALSE(log_is_enabled(Info, logging));
+
+  set_log_config("stdout", "logging*=info");
+  set_log_config(TestLogFileName, "logging*=info");
+
+  EXPECT_TRUE(log_is_enabled(Info, logging));
+  LogConfiguration::disable_tags(false, LOG_TAGS(logging));
+  EXPECT_FALSE(log_is_enabled(Info, logging, gc));
+  EXPECT_FALSE(log_is_enabled(Info, logging));
+}
+
 // Test reconfiguration of the selected decorators for an output
 TEST_VM_F(LogConfigurationTest, reconfigure_decorators) {
   // Configure stderr with all decorators