--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/debug/BenchmarkCounters.java	Tue Mar 18 09:57:40 2014 +0100
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/debug/BenchmarkCounters.java	Tue Mar 18 09:59:33 2014 +0100
@@ -50,10 +50,10 @@
  * infrastructure is enabled by specifying either the GenericDynamicCounters or
  * BenchmarkDynamicCounters option.<br/>
  * 
- * The counters are kept in a special area in the native JavaThread object, and the number of
- * counters is configured in {@code thread.hpp (GRAAL_COUNTERS_SIZE)}. This file also contains an
- * option to exclude compiler threads ({@code GRAAL_COUNTERS_EXCLUDE_COMPILER_THREADS}, which
- * defaults to true).
+ * The counters are kept in a special area allocated for each native JavaThread object, and the
+ * number of counters is configured using {@code -XX:GraalCounterSize=value}.
+ * {@code -XX:+/-GraalCountersExcludeCompiler} configures whether to exclude compiler threads
+ * (defaults to true).
  * 
  * The subsystems that use the logging need to have their own options to turn on the counters, and
  * insert DynamicCounterNodes when they're enabled.
@@ -64,12 +64,10 @@
  * <h1>Example</h1> In order to create statistics about allocations within the DaCapo pmd benchmark
  * the following steps are necessary:
  * <ul>
- * <li>Modify {@code thread.hpp}: increase GRAAL_COUNTER_SIZE. The actual required value depends on
- * the granularity of the profiling, 10000 should be enough for most cases. This will increase the
- * JavaThread structure by 80kb.</li>
- * <li>Also in {@code thread.hpp}: GRAAL_COUNTERS_EXCLUDE_COMPILER_THREADS specifies whether the
- * numbers generated by compiler threads should be excluded (default: true).</li>
- * <li>Build the Graal VM.</li>
+ * <li>Set {@code -XX:GraalCounterSize=value}. The actual required value depends on the granularity
+ * of the profiling, 10000 should be enough for most cases.</li>
+ * <li>Also: {@code -XX:+/-GraalCountersExcludeCompiler} specifies whether the numbers generated by
+ * compiler threads should be excluded (default: true).</li>
  * <li>Start the DaCapo pmd benchmark with
  * {@code "-G:BenchmarkDynamicCounters=err, starting ====, PASSED in "} and
  * {@code -G:+ProfileAllocations}.</li>
@@ -330,7 +328,7 @@
 
             int index = BenchmarkCounters.getIndex(counter);
             if (index >= config.graalCountersSize) {
-                throw new GraalInternalError("too many counters, reduce number of counters or increase GRAAL_COUNTERS_SIZE (current value: " + config.graalCountersSize + ")");
+                throw new GraalInternalError("too many counters, reduce number of counters or increase -XX:GraalCounterSize=... (current value: " + config.graalCountersSize + ")");
             }
             ConstantLocationNode arrayLocation = ConstantLocationNode.create(LocationIdentity.ANY_LOCATION, Kind.Long, config.graalCountersThreadOffset, graph);
             ReadNode readArray = graph.add(new ReadNode(thread, arrayLocation, StampFactory.forKind(wordKind), BarrierType.NONE, false));