8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo

Summary: Improve the output of G1PrintRegionLivenessInfo by adding a per-region remembered set size information column
Reviewed-by: jwilhelm, johnc

src/share/vm/gc_implementation/g1/concurrentMark.cpp

@@ -4515,7 +4515,8 @@ G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name)
     _total_used_bytes(0), _total_capacity_bytes(0),
     _total_prev_live_bytes(0), _total_next_live_bytes(0),
     _hum_used_bytes(0), _hum_capacity_bytes(0),
-    _hum_prev_live_bytes(0), _hum_next_live_bytes(0) {
+    _hum_prev_live_bytes(0), _hum_next_live_bytes(0),
+    _total_remset_bytes(0) {
   G1CollectedHeap* g1h = G1CollectedHeap::heap();
   MemRegion g1_committed = g1h->g1_committed();
   MemRegion g1_reserved = g1h->g1_reserved();
@@ -4538,18 +4539,20 @@ G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name)
                 G1PPRL_BYTE_H_FORMAT
                 G1PPRL_BYTE_H_FORMAT
                 G1PPRL_BYTE_H_FORMAT
-                 G1PPRL_DOUBLE_H_FORMAT,
+                G1PPRL_DOUBLE_H_FORMAT
+                G1PPRL_BYTE_H_FORMAT,
                 "type", "address-range",
-                 "used", "prev-live", "next-live", "gc-eff");
+                "used", "prev-live", "next-live", "gc-eff", "remset");
   _out->print_cr(G1PPRL_LINE_PREFIX
                 G1PPRL_TYPE_H_FORMAT
                 G1PPRL_ADDR_BASE_H_FORMAT
                 G1PPRL_BYTE_H_FORMAT
                 G1PPRL_BYTE_H_FORMAT
                 G1PPRL_BYTE_H_FORMAT
-                 G1PPRL_DOUBLE_H_FORMAT,
+                G1PPRL_DOUBLE_H_FORMAT
+                G1PPRL_BYTE_H_FORMAT,
                 "", "",
-                 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)");
+                "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", "(bytes)");
 }
 
 // It takes as a parameter a reference to one of the _hum_* fields, it
@@ -4591,6 +4594,7 @@ bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) {
   size_t prev_live_bytes = r->live_bytes();
   size_t next_live_bytes = r->next_live_bytes();
   double gc_eff          = r->gc_efficiency();
+  size_t remset_bytes    = r->rem_set()->mem_size();
   if (r->used() == 0) {
     type = "FREE";
   } else if (r->is_survivor()) {
@@ -4624,6 +4628,7 @@ bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) {
   _total_capacity_bytes  += capacity_bytes;
   _total_prev_live_bytes += prev_live_bytes;
   _total_next_live_bytes += next_live_bytes;
+  _total_remset_bytes    += remset_bytes;
 
   // Print a line for this particular region.
   _out->print_cr(G1PPRL_LINE_PREFIX
@@ -4632,14 +4637,17 @@ bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) {
                  G1PPRL_BYTE_FORMAT
                  G1PPRL_BYTE_FORMAT
                  G1PPRL_BYTE_FORMAT
-                 G1PPRL_DOUBLE_FORMAT,
+                 G1PPRL_DOUBLE_FORMAT
+                 G1PPRL_BYTE_FORMAT,
                  type, bottom, end,
-                 used_bytes, prev_live_bytes, next_live_bytes, gc_eff);
+                 used_bytes, prev_live_bytes, next_live_bytes, gc_eff , remset_bytes);
 
   return false;
 }
 
 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() {
+  // add static memory usages to remembered set sizes
+  _total_remset_bytes += HeapRegionRemSet::fl_mem_size() + HeapRegionRemSet::static_mem_size();
   // Print the footer of the output.
   _out->print_cr(G1PPRL_LINE_PREFIX);
   _out->print_cr(G1PPRL_LINE_PREFIX
@@ -4647,13 +4655,15 @@ G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() {
                  G1PPRL_SUM_MB_FORMAT("capacity")
                  G1PPRL_SUM_MB_PERC_FORMAT("used")
                  G1PPRL_SUM_MB_PERC_FORMAT("prev-live")
-                 G1PPRL_SUM_MB_PERC_FORMAT("next-live"),
+                 G1PPRL_SUM_MB_PERC_FORMAT("next-live")
+                 G1PPRL_SUM_MB_FORMAT("remset"),
                  bytes_to_mb(_total_capacity_bytes),
                  bytes_to_mb(_total_used_bytes),
                  perc(_total_used_bytes, _total_capacity_bytes),
                  bytes_to_mb(_total_prev_live_bytes),
                  perc(_total_prev_live_bytes, _total_capacity_bytes),
                  bytes_to_mb(_total_next_live_bytes),
-                 perc(_total_next_live_bytes, _total_capacity_bytes));
+                 perc(_total_next_live_bytes, _total_capacity_bytes),
+                 bytes_to_mb(_total_remset_bytes));
   _out->cr();
 }

src/share/vm/gc_implementation/g1/concurrentMark.hpp

@@ -1257,6 +1257,9 @@ private:
   size_t _hum_prev_live_bytes;
   size_t _hum_next_live_bytes;
 
+  // Accumulator for the remembered set size
+  size_t _total_remset_bytes;
+
   static double perc(size_t val, size_t total) {
     if (total == 0) {
       return 0.0;

src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp

@@ -706,10 +706,11 @@ size_t OtherRegionsTable::mem_size() const {
   // Cast away const in this case.
   MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag);
   size_t sum = 0;
-  PerRegionTable * cur = _first_all_fine_prts;
-  while (cur != NULL) {
-    sum += cur->mem_size();
-    cur = cur->next();
+  // all PRTs are of the same size so it is sufficient to query only one of them.
+  if (_first_all_fine_prts != NULL) {
+    assert(_last_all_fine_prts != NULL &&
+      _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant");
+    sum += _first_all_fine_prts->mem_size() * _n_fine_entries;
   }
   sum += (sizeof(PerRegionTable*) * _max_fine_entries);
   sum += (_coarse_map.size_in_words() * HeapWordSize);

test/gc/g1/TestPrintRegionRememberedSetInfo.java

+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test TestPrintRegionRememberedSetInfo
+ * @key gc
+ * @bug 8014240
+ * @summary Test output of G1PrintRegionRememberedSetInfo
+ * @library /testlibrary
+ * @build TestPrintRegionRememberedSetInfo
+ * @author thomas.schatzl@oracle.com
+ */
+
+import com.oracle.java.testlibrary.*;
+import java.lang.Thread;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+class RunAndWaitForMarking {
+    public static void main(String[] args) {
+        System.gc();
+        try {
+            Thread.sleep(200);
+        } catch (InterruptedException e) {
+        }
+    }
+}
+
+public class TestPrintRegionRememberedSetInfo {
+
+    public static String runTest(String arg) throws Exception {
+        ArrayList<String> finalargs = new ArrayList<String>();
+        String[] defaultArgs = new String[] {
+            "-XX:+UseG1GC",
+            "-Xmx10m",
+            "-XX:+ExplicitGCInvokesConcurrent",
+            "-XX:+UnlockDiagnosticVMOptions",
+            "-XX:+G1PrintRegionLivenessInfo",
+            "-XX:G1HeapRegionSize=1M",
+            "-XX:InitiatingHeapOccupancyPercent=0",
+        };
+
+        finalargs.addAll(Arrays.asList(defaultArgs));
+        finalargs.add(arg);
+
+        finalargs.add(RunAndWaitForMarking.class.getName());
+
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+            finalargs.toArray(new String[0]));
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+        output.shouldHaveExitValue(0);
+
+        String result = output.getStdout();
+        return result;
+    }
+
+    public static void main(String[] args) throws Exception {
+        String result;
+
+        result = runTest("-XX:+G1PrintRegionLivenessInfo");
+        // check that we got region statistics output
+        if (result.indexOf("PHASE") == -1) {
+            throw new RuntimeException("Unexpected output from -XX:+PrintRegionLivenessInfo found.");
+        }
+
+        result = runTest("-XX:-G1PrintRegionLivenessInfo");
+        if (result.indexOf("remset") != -1) {
+            throw new RuntimeException("Should find remembered set information in output.");
+        }
+    }
+}
+