8243315: ParallelScavengeHeap::initialize() passes GenAlignment as pa…

…ge size to os::trace_page_sizes instead of actual page size

Reviewed-by: sjohanss, tschatzl

src/hotspot/share/gc/g1/g1CollectedHeap.cpp

@@ -1476,32 +1476,13 @@ G1CollectedHeap::G1CollectedHeap() :
   guarantee(_task_queues != NULL, "task_queues allocation failure.");
 }
 
-static size_t actual_reserved_page_size(ReservedSpace rs) {
-  size_t page_size = os::vm_page_size();
-  if (UseLargePages) {
-    // There are two ways to manage large page memory.
-    // 1. OS supports committing large page memory.
-    // 2. OS doesn't support committing large page memory so ReservedSpace manages it.
-    //    And ReservedSpace calls it 'special'. If we failed to set 'special',
-    //    we reserved memory without large page.
-    if (os::can_commit_large_page_memory() || rs.special()) {
-      // An alignment at ReservedSpace comes from preferred page size or
-      // heap alignment, and if the alignment came from heap alignment, it could be
-      // larger than large pages size. So need to cap with the large page size.
-      page_size = MIN2(rs.alignment(), os::large_page_size());
-    }
-  }
-
-  return page_size;
-}
-
 G1RegionToSpaceMapper* G1CollectedHeap::create_aux_memory_mapper(const char* description,
                                                                  size_t size,
                                                                  size_t translation_factor) {
   size_t preferred_page_size = os::page_size_for_region_unaligned(size, 1);
   // Allocate a new reserved space, preferring to use large pages.
   ReservedSpace rs(size, preferred_page_size);
-  size_t page_size = actual_reserved_page_size(rs);
+  size_t page_size = ReservedSpace::actual_reserved_page_size(rs);
   G1RegionToSpaceMapper* result  =
     G1RegionToSpaceMapper::create_mapper(rs,
                                          size,
@@ -1593,7 +1574,7 @@ jint G1CollectedHeap::initialize() {
   _hot_card_cache = new G1HotCardCache(this);
 
   // Create space mappers.
-  size_t page_size = actual_reserved_page_size(heap_rs);
+  size_t page_size = ReservedSpace::actual_reserved_page_size(heap_rs);
   G1RegionToSpaceMapper* heap_storage =
     G1RegionToSpaceMapper::create_mapper(heap_rs,
                                          heap_rs.size(),

src/hotspot/share/gc/parallel/parallelInitLogger.cpp

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2020, 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/parallel/parallelInitLogger.hpp"
+#include "gc/shared/genArguments.hpp"
+#include "gc/shared/gcLogPrecious.hpp"
+
+void ParallelInitLogger::print_heap() {
+  log_info_p(gc, init)("Alignments:"
+                       " Space " SIZE_FORMAT "%s,"
+                       " Generation " SIZE_FORMAT "%s,"
+                       " Heap " SIZE_FORMAT "%s",
+                       byte_size_in_exact_unit(SpaceAlignment), exact_unit_for_byte_size(SpaceAlignment),
+                       byte_size_in_exact_unit(GenAlignment), exact_unit_for_byte_size(GenAlignment),
+                       byte_size_in_exact_unit(HeapAlignment), exact_unit_for_byte_size(HeapAlignment));
+  GCInitLogger::print_heap();
+}
+
+void ParallelInitLogger::print() {
+  ParallelInitLogger init_log;
+  init_log.print_all();
+}

src/hotspot/share/gc/parallel/parallelInitLogger.hpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2020, 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.
+ *
+ */
+
+#ifndef SHARE_GC_PARALLEL_PARALLELINITLOGGER_HPP
+#define SHARE_GC_PARALLEL_PARALLELINITLOGGER_HPP
+
+#include "gc/shared/gcInitLogger.hpp"
+
+class ParallelInitLogger : public GCInitLogger {
+ protected:
+  virtual void print_heap();
+ public:
+  static void print();
+};
+
+#endif //SHARE_GC_PARALLEL_PARALLELINITLOGGER_HPP

src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp

@@ -26,6 +26,7 @@
 #include "code/codeCache.hpp"
 #include "gc/parallel/parallelArguments.hpp"
 #include "gc/parallel/objectStartArray.inline.hpp"
+#include "gc/parallel/parallelInitLogger.hpp"
 #include "gc/parallel/parallelScavengeHeap.inline.hpp"
 #include "gc/parallel/psAdaptiveSizePolicy.hpp"
 #include "gc/parallel/psMemoryPool.hpp"
@@ -63,12 +64,7 @@ jint ParallelScavengeHeap::initialize() {
 
   ReservedHeapSpace heap_rs = Universe::reserve_heap(reserved_heap_size, HeapAlignment);
 
-  os::trace_page_sizes("Heap",
-                       MinHeapSize,
-                       reserved_heap_size,
-                       GenAlignment,
-                       heap_rs.base(),
-                       heap_rs.size());
+  trace_actual_reserved_page_size(reserved_heap_size, heap_rs);
 
   initialize_reserved_region(heap_rs);
 
@@ -133,7 +129,7 @@ jint ParallelScavengeHeap::initialize() {
     return JNI_ENOMEM;
   }
 
-  GCInitLogger::print();
+  ParallelInitLogger::print();
 
   return JNI_OK;
 }
@@ -739,6 +735,19 @@ void ParallelScavengeHeap::verify(VerifyOption option /* ignored */) {
   }
 }
 
+void ParallelScavengeHeap::trace_actual_reserved_page_size(const size_t reserved_heap_size, const ReservedSpace rs) {
+  // Check if Info level is enabled, since os::trace_page_sizes() logs on Info level.
+  if(log_is_enabled(Info, pagesize)) {
+    const size_t page_size = ReservedSpace::actual_reserved_page_size(rs);
+    os::trace_page_sizes("Heap",
+                         MinHeapSize,
+                         reserved_heap_size,
+                         page_size,
+                         rs.base(),
+                         rs.size());
+  }
+}
+
 void ParallelScavengeHeap::trace_heap(GCWhen::Type when, const GCTracer* gc_tracer) {
   const PSHeapSummary& heap_summary = create_ps_heap_summary();
   gc_tracer->report_gc_heap_summary(when, heap_summary);

src/hotspot/share/gc/parallel/parallelScavengeHeap.hpp

@@ -77,6 +77,7 @@ class ParallelScavengeHeap : public CollectedHeap {
 
   virtual void initialize_serviceability();
 
+  void trace_actual_reserved_page_size(const size_t reserved_heap_size, const ReservedSpace rs);
   void trace_heap(GCWhen::Type when, const GCTracer* tracer);
 
  protected:

src/hotspot/share/memory/virtualspace.cpp

@@ -286,6 +286,24 @@ size_t ReservedSpace::allocation_align_size_up(size_t size) {
   return align_up(size, os::vm_allocation_granularity());
 }
 
+size_t ReservedSpace::actual_reserved_page_size(const ReservedSpace& rs) {
+  size_t page_size = os::vm_page_size();
+  if (UseLargePages) {
+    // There are two ways to manage large page memory.
+    // 1. OS supports committing large page memory.
+    // 2. OS doesn't support committing large page memory so ReservedSpace manages it.
+    //    And ReservedSpace calls it 'special'. If we failed to set 'special',
+    //    we reserved memory without large page.
+    if (os::can_commit_large_page_memory() || rs.special()) {
+      // An alignment at ReservedSpace comes from preferred page size or
+      // heap alignment, and if the alignment came from heap alignment, it could be
+      // larger than large pages size. So need to cap with the large page size.
+      page_size = MIN2(rs.alignment(), os::large_page_size());
+    }
+  }
+
+  return page_size;
+}
 
 void ReservedSpace::release() {
   if (is_reserved()) {

src/hotspot/share/memory/virtualspace.hpp

@@ -96,6 +96,8 @@ class ReservedSpace {
   bool contains(const void* p) const {
     return (base() <= ((char*)p)) && (((char*)p) < (base() + size()));
   }
+
+  static size_t actual_reserved_page_size(const ReservedSpace& rs);
 };
 
 ReservedSpace