Standardize some of the profiler sampling frequencies (#7961)

* Standardize some of the profiler sampling frequencies

* Allow override of 50ms J9 CPU default

* Touchups

Author: Matt

dd-java-agent/agent-profiling/profiling-ddprof/src/main/java/com/datadog/profiling/ddprof/DatadogProfiler.java

@@ -36,6 +36,7 @@
 import com.datadog.profiling.utils.ProfilingMode;
 import com.datadoghq.profiler.ContextSetter;
 import com.datadoghq.profiler.JavaProfiler;
+import datadog.trace.api.Platform;
 import datadog.trace.api.config.ProfilingConfig;
 import datadog.trace.api.profiling.RecordingData;
 import datadog.trace.bootstrap.config.provider.ConfigProvider;
@@ -268,7 +269,13 @@ String cmdStartProfiling(Path file) throws IllegalStateException {
         }
       } else {
         // using cpu time schedule
-        cmd.append(",cpu=").append(getCpuInterval(configProvider)).append('m');
+        int interval = getCpuInterval();
+        if (Platform.isJ9())
+          interval =
+              interval == ProfilingConfig.PROFILING_DATADOG_PROFILER_CPU_INTERVAL_DEFAULT
+                  ? ProfilingConfig.PROFILING_DATADOG_PROFILER_J9_CPU_INTERVAL_DEFAULT
+                  : interval;
+        cmd.append(",cpu=").append(interval).append('m');
       }
     }
     if (profilingModes.contains(WALL)) {

dd-trace-api/src/main/java/datadog/trace/api/config/ProfilingConfig.java

@@ -106,7 +106,9 @@ public final class ProfilingConfig {
   public static final boolean PROFILING_DATADOG_PROFILER_WALL_ENABLED_DEFAULT = true;
   public static final String PROFILING_DATADOG_PROFILER_WALL_INTERVAL =
       "profiling.ddprof.wall.interval.ms";
-  public static final int PROFILING_DATADOG_PROFILER_WALL_INTERVAL_DEFAULT = 10;
+  public static final int PROFILING_DATADOG_PROFILER_WALL_INTERVAL_DEFAULT = 50;
+
+  public static final int PROFILING_DATADOG_PROFILER_J9_CPU_INTERVAL_DEFAULT = 50;
 
   public static final String PROFILING_DATADOG_PROFILER_WALL_COLLAPSING =
       "profiling.ddprof.wall.collapsing";