BTrace script to log System.gc() calls

TraceSystemGCCall.java

import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;

@BTrace
public class TraceSystemGCCall {
  @OnMethod(
    clazz="/.*/",
    method="/.*/",
    location=@Location(
      value=Kind.CALL,
      clazz="java.lang.System",
      method="gc"
    )
  )
  public static void onSystemGC() {
    jstack();
  }
}