8152491: Convert TracePageSizes to use UL

Reviewed-by: sjohanss, pliden

hotspot/src/os/windows/vm/os_windows.cpp

@@ -3006,9 +3006,7 @@ static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
       }
 #ifdef ASSERT
       if (should_inject_error) {
-        if (TracePageSizes && Verbose) {
+        log_develop_debug(pagesize)("Reserving pages individually failed.");
-          tty->print_cr("Reserving pages individually failed.");
-        }
       }
 #endif
       return NULL;
@@ -3192,9 +3190,8 @@ char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
   // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
   // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
   if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
-    if (TracePageSizes && Verbose) {
+    log_debug(pagesize)("Reserving large pages individually.");
-      tty->print_cr("Reserving large pages individually.");
+
-    }
     char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
     if (p_buf == NULL) {
       // give an appropriate warning message
@@ -3211,9 +3208,8 @@ char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
     return p_buf;
 
   } else {
-    if (TracePageSizes && Verbose) {
+    log_debug(pagesize)("Reserving large pages in a single large chunk.");
-      tty->print_cr("Reserving large pages in a single large chunk.");
+
-    }
     // normal policy just allocate it all at once
     DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
     char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);

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

@@ -1829,10 +1829,14 @@ G1RegionToSpaceMapper* G1CollectedHeap::create_aux_memory_mapper(const char* des
                                          HeapRegion::GrainBytes,
                                          translation_factor,
                                          mtGC);
-  if (TracePageSizes) {
+
-    tty->print_cr("G1 '%s': pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT " size=" SIZE_FORMAT " alignment=" SIZE_FORMAT " reqsize=" SIZE_FORMAT,
+  os::trace_page_sizes_for_requested_size(description,
-                  description, preferred_page_size, p2i(rs.base()), rs.size(), rs.alignment(), size);
+                                          size,
-  }
+                                          preferred_page_size,
+                                          rs.alignment(),
+                                          rs.base(),
+                                          rs.size());
+
   return result;
 }
 
@@ -1906,26 +1910,28 @@ jint G1CollectedHeap::initialize() {
                                          HeapRegion::GrainBytes,
                                          1,
                                          mtJavaHeap);
-  os::trace_page_sizes("G1 Heap", collector_policy()->min_heap_byte_size(),
+  os::trace_page_sizes("Heap",
-                       max_byte_size, page_size,
+                       collector_policy()->min_heap_byte_size(),
+                       max_byte_size,
+                       page_size,
                        heap_rs.base(),
                        heap_rs.size());
   heap_storage->set_mapping_changed_listener(&_listener);
 
   // Create storage for the BOT, card table, card counts table (hot card cache) and the bitmaps.
   G1RegionToSpaceMapper* bot_storage =
-    create_aux_memory_mapper("Block offset table",
+    create_aux_memory_mapper("Block Offset Table",
                              G1BlockOffsetTable::compute_size(g1_rs.size() / HeapWordSize),
                              G1BlockOffsetTable::heap_map_factor());
 
   ReservedSpace cardtable_rs(G1SATBCardTableLoggingModRefBS::compute_size(g1_rs.size() / HeapWordSize));
   G1RegionToSpaceMapper* cardtable_storage =
-    create_aux_memory_mapper("Card table",
+    create_aux_memory_mapper("Card Table",
                              G1SATBCardTableLoggingModRefBS::compute_size(g1_rs.size() / HeapWordSize),
                              G1SATBCardTableLoggingModRefBS::heap_map_factor());
 
   G1RegionToSpaceMapper* card_counts_storage =
-    create_aux_memory_mapper("Card counts table",
+    create_aux_memory_mapper("Card Counts Table",
                              G1CardCounts::compute_size(g1_rs.size() / HeapWordSize),
                              G1CardCounts::heap_map_factor());
 

hotspot/src/share/vm/gc/parallel/generationSizer.cpp

@@ -26,18 +26,6 @@
 #include "gc/parallel/generationSizer.hpp"
 #include "gc/shared/collectorPolicy.hpp"
 
-void GenerationSizer::trace_gen_sizes(const char* const str) {
-  if (TracePageSizes) {
-    tty->print_cr("%s:  " SIZE_FORMAT "," SIZE_FORMAT " "
-                  SIZE_FORMAT "," SIZE_FORMAT " "
-                  SIZE_FORMAT,
-                  str,
-                  _min_old_size / K, _max_old_size / K,
-                  _min_young_size / K, _max_young_size / K,
-                  _max_heap_byte_size / K);
-  }
-}
-
 void GenerationSizer::initialize_alignments() {
   _space_alignment = _gen_alignment = default_gen_alignment();
   _heap_alignment = compute_heap_alignment();
@@ -60,7 +48,6 @@ void GenerationSizer::initialize_flags() {
 }
 
 void GenerationSizer::initialize_size_info() {
-  trace_gen_sizes("ps heap raw");
   const size_t max_page_sz = os::page_size_for_region_aligned(_max_heap_byte_size, 8);
   const size_t min_pages = 4; // 1 for eden + 1 for each survivor + 1 for old
   const size_t min_page_sz = os::page_size_for_region_aligned(_min_heap_byte_size, min_pages);
@@ -76,6 +63,4 @@ void GenerationSizer::initialize_size_info() {
     initialize_flags();
   }
   GenCollectorPolicy::initialize_size_info();
-
-  trace_gen_sizes("ps heap rnd");
 }

hotspot/src/share/vm/gc/parallel/generationSizer.hpp

@@ -33,8 +33,6 @@
 class GenerationSizer : public GenCollectorPolicy {
  private:
 
-  void trace_gen_sizes(const char* const str);
-
   // The alignment used for boundary between young gen and old gen
   static size_t default_gen_alignment() { return 64 * K * HeapWordSize; }
 

hotspot/src/share/vm/gc/parallel/parMarkBitMap.cpp

@@ -49,7 +49,7 @@ ParMarkBitMap::initialize(MemRegion covered_region)
   const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 :
     MAX2(page_sz, granularity);
   ReservedSpace rs(_reserved_byte_size, rs_align, rs_align > 0);
-  os::trace_page_sizes("par bitmap", raw_bytes, raw_bytes, page_sz,
+  os::trace_page_sizes("Mark Bitmap", raw_bytes, raw_bytes, page_sz,
                        rs.base(), rs.size());
 
   MemTracker::record_virtual_memory_type((address)rs.base(), mtGC);

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

@@ -60,8 +60,10 @@ jint ParallelScavengeHeap::initialize() {
 
   ReservedSpace heap_rs = Universe::reserve_heap(heap_size, _collector_policy->heap_alignment());
 
-  os::trace_page_sizes("ps main", _collector_policy->min_heap_byte_size(),
+  os::trace_page_sizes("Heap",
-                       heap_size, generation_alignment(),
+                       _collector_policy->min_heap_byte_size(),
+                       heap_size,
+                       generation_alignment(),
                        heap_rs.base(),
                        heap_rs.size());
 

hotspot/src/share/vm/gc/parallel/psParallelCompact.cpp

@@ -426,7 +426,7 @@ ParallelCompactData::create_vspace(size_t count, size_t element_size)
   const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 :
     MAX2(page_sz, granularity);
   ReservedSpace rs(_reserved_byte_size, rs_align, rs_align > 0);
-  os::trace_page_sizes("par compact", raw_bytes, raw_bytes, page_sz, rs.base(),
+  os::trace_page_sizes("Parallel Compact Data", raw_bytes, raw_bytes, page_sz, rs.base(),
                        rs.size());
 
   MemTracker::record_virtual_memory_type((address)rs.base(), mtGC);

hotspot/src/share/vm/gc/shared/cardTableModRefBS.cpp

@@ -93,7 +93,7 @@ void CardTableModRefBS::initialize() {
 
   MemTracker::record_virtual_memory_type((address)heap_rs.base(), mtGC);
 
-  os::trace_page_sizes("card table", _guard_index + 1, _guard_index + 1,
+  os::trace_page_sizes("Card Table", _guard_index + 1, _guard_index + 1,
                        _page_size, heap_rs.base(), heap_rs.size());
   if (!heap_rs.is_reserved()) {
     vm_exit_during_initialization("Could not reserve enough space for the "

hotspot/src/share/vm/gc/shared/genCollectedHeap.cpp

@@ -167,6 +167,14 @@ char* GenCollectedHeap::allocate(size_t alignment,
          SIZE_FORMAT, total_reserved, alignment);
 
   *heap_rs = Universe::reserve_heap(total_reserved, alignment);
+
+  os::trace_page_sizes("Heap",
+                       collector_policy()->min_heap_byte_size(),
+                       total_reserved,
+                       alignment,
+                       heap_rs->base(),
+                       heap_rs->size());
+
   return heap_rs->base();
 }
 

hotspot/src/share/vm/logging/logTag.hpp

@@ -70,6 +70,7 @@
   LOG_TAG(monitorinflation) \
   LOG_TAG(monitormismatch) \
   LOG_TAG(os) \
+  LOG_TAG(pagesize) \
   LOG_TAG(phases) \
   LOG_TAG(plab) \
   LOG_TAG(promotion) \

hotspot/src/share/vm/runtime/globals.hpp

@@ -685,9 +685,6 @@ public:
           "Use large page memory in metaspace. "                            \
           "Only used if UseLargePages is enabled.")                         \
                                                                             \
-  develop(bool, TracePageSizes, false,                                      \
-          "Trace page size selection and usage")                            \
-                                                                            \
   product(bool, UseNUMA, false,                                             \
           "Use NUMA if available")                                          \
                                                                             \

hotspot/src/share/vm/runtime/os.cpp

@@ -33,6 +33,7 @@
 #include "gc/shared/vmGCOperations.hpp"
 #include "interpreter/interpreter.hpp"
 #include "logging/log.hpp"
+#include "logging/logStream.inline.hpp"
 #include "memory/allocation.inline.hpp"
 #ifdef ASSERT
 #include "memory/guardedMemory.hpp"
@@ -1494,31 +1495,63 @@ const char* os::errno_name(int e) {
   return errno_to_string(e, true);
 }
 
-#ifndef PRODUCT
+void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) {
-void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count)
+  LogTarget(Info, pagesize) log;
-{
+  if (log.is_enabled()) {
-  if (TracePageSizes) {
+    LogStreamCHeap out(log);
-    tty->print("%s: ", str);
+
+    out.print("%s: ", str);
     for (int i = 0; i < count; ++i) {
-      tty->print(" " SIZE_FORMAT, page_sizes[i]);
+      out.print(" " SIZE_FORMAT, page_sizes[i]);
     }
-    tty->cr();
+    out.cr();
   }
 }
 
-void os::trace_page_sizes(const char* str, const size_t region_min_size,
+#define trace_page_size_params(size) byte_size_in_exact_unit(size), exact_unit_for_byte_size(size)
-                          const size_t region_max_size, const size_t page_size,
+
-                          const char* base, const size_t size)
+void os::trace_page_sizes(const char* str,
-{
+                          const size_t region_min_size,
-  if (TracePageSizes) {
+                          const size_t region_max_size,
-    tty->print_cr("%s:  min=" SIZE_FORMAT " max=" SIZE_FORMAT
+                          const size_t page_size,
-                  " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT
+                          const char* base,
-                  " size=" SIZE_FORMAT,
+                          const size_t size) {
-                  str, region_min_size, region_max_size,
+
-                  page_size, p2i(base), size);
+  log_info(pagesize)("%s: "
+                     " min=" SIZE_FORMAT "%s"
+                     " max=" SIZE_FORMAT "%s"
+                     " base=" PTR_FORMAT
+                     " page_size=" SIZE_FORMAT "%s"
+                     " size=" SIZE_FORMAT "%s",
+                     str,
+                     trace_page_size_params(region_min_size),
+                     trace_page_size_params(region_max_size),
+                     p2i(base),
+                     trace_page_size_params(page_size),
+                     trace_page_size_params(size));
 }
+
+void os::trace_page_sizes_for_requested_size(const char* str,
+                                             const size_t requested_size,
+                                             const size_t page_size,
+                                             const size_t alignment,
+                                             const char* base,
+                                             const size_t size) {
+
+  log_info(pagesize)("%s:"
+                     " req_size=" SIZE_FORMAT "%s"
+                     " base=" PTR_FORMAT
+                     " page_size=" SIZE_FORMAT "%s"
+                     " alignment=" SIZE_FORMAT "%s"
+                     " size=" SIZE_FORMAT "%s",
+                     str,
+                     trace_page_size_params(requested_size),
+                     p2i(base),
+                     trace_page_size_params(page_size),
+                     trace_page_size_params(alignment),
+                     trace_page_size_params(size));
 }
-#endif  // #ifndef PRODUCT
+
 
 // This is the working definition of a server class machine:
 // >= 2 physical CPU's and >=2GB of memory, with some fuzz

hotspot/src/share/vm/runtime/os.hpp

@@ -286,18 +286,24 @@ class os: AllStatic {
     return _page_sizes[0];
   }
 
-  // Methods for tracing page sizes returned by the above method; enabled by
+  // Methods for tracing page sizes returned by the above method.
-  // TracePageSizes.  The region_{min,max}_size parameters should be the values
+  // The region_{min,max}_size parameters should be the values
   // passed to page_size_for_region() and page_size should be the result of that
   // call.  The (optional) base and size parameters should come from the
   // ReservedSpace base() and size() methods.
-  static void trace_page_sizes(const char* str, const size_t* page_sizes,
+  static void trace_page_sizes(const char* str, const size_t* page_sizes, int count);
-                               int count) PRODUCT_RETURN;
+  static void trace_page_sizes(const char* str,
-  static void trace_page_sizes(const char* str, const size_t region_min_size,
+                               const size_t region_min_size,
                                const size_t region_max_size,
                                const size_t page_size,
-                               const char* base = NULL,
+                               const char* base,
-                               const size_t size = 0) PRODUCT_RETURN;
+                               const size_t size);
+  static void trace_page_sizes_for_requested_size(const char* str,
+                                                  const size_t requested_size,
+                                                  const size_t page_size,
+                                                  const size_t alignment,
+                                                  const char* base,
+                                                  const size_t size);
 
   static int    vm_allocation_granularity();
   static char*  reserve_memory(size_t bytes, char* addr = 0,

hotspot/src/share/vm/utilities/globalDefinitions.cpp

@@ -374,12 +374,10 @@ STATIC_ASSERT(left_n_bits(1|2) == (intptr_t) LP64_ONLY(0xE000000000000000) NOT_L
 
 #ifndef PRODUCT
 // For unit testing only
-class GlobalDefinitions {
+class TestGlobalDefinitions {
-public:
+private:
-  static void test_globals();
-};
 
-void GlobalDefinitions::test_globals() {
+  static void test_clamp_address_in_page() {
     intptr_t page_sizes[] = { os::vm_page_size(), 4096, 8192, 65536, 2*1024*1024 };
     const int num_page_sizes = sizeof(page_sizes) / sizeof(page_sizes[0]);
 
@@ -405,8 +403,60 @@ void GlobalDefinitions::test_globals() {
     }
   }
 
-void GlobalDefinitions_test() {
+  static void test_exact_unit_for_byte_size() {
-  GlobalDefinitions::test_globals();
+    assert(strcmp(exact_unit_for_byte_size(0),     "B") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(1),     "B") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(K - 1), "B") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(K),     "K") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(K + 1), "B") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(M - 1), "B") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(M),     "M") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(M + 1), "B") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(M + K), "K") == 0, "incorrect");
+#ifdef LP64
+    assert(strcmp(exact_unit_for_byte_size(G - 1),     "B") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(G),         "G") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(G + 1),     "B") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(G + K),     "K") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(G + M),     "M") == 0, "incorrect");
+    assert(strcmp(exact_unit_for_byte_size(G + M + K), "K") == 0, "incorrect");
+#endif
+  }
+
+  static void test_byte_size_in_exact_unit() {
+    assert(byte_size_in_exact_unit(0)     == 0,     "incorrect");
+    assert(byte_size_in_exact_unit(1)     == 1,     "incorrect");
+    assert(byte_size_in_exact_unit(K - 1) == K - 1, "incorrect");
+    assert(byte_size_in_exact_unit(K)     == 1,     "incorrect");
+    assert(byte_size_in_exact_unit(K + 1) == K + 1, "incorrect");
+    assert(byte_size_in_exact_unit(M - 1) == M - 1, "incorrect");
+    assert(byte_size_in_exact_unit(M)     == 1,     "incorrect");
+    assert(byte_size_in_exact_unit(M + 1) == M + 1, "incorrect");
+    assert(byte_size_in_exact_unit(M + K) == K + 1, "incorrect");
+#ifdef LP64
+    assert(byte_size_in_exact_unit(G - 1)     == G - 1,     "incorrect");
+    assert(byte_size_in_exact_unit(G)         == 1,         "incorrect");
+    assert(byte_size_in_exact_unit(G + 1)     == G + 1,     "incorrect");
+    assert(byte_size_in_exact_unit(G + K)     == M + 1,     "incorrect");
+    assert(byte_size_in_exact_unit(G + M)     == K + 1,     "incorrect");
+    assert(byte_size_in_exact_unit(G + M + K) == M + K + 1, "incorrect");
+#endif
+  }
+
+  static void test_exact_units() {
+    test_exact_unit_for_byte_size();
+    test_byte_size_in_exact_unit();
+  }
+
+public:
+  static void test() {
+    test_clamp_address_in_page();
+    test_exact_units();
+  }
+};
+
+void TestGlobalDefinitions_test() {
+  TestGlobalDefinitions::test();
 }
 
 #endif // PRODUCT

hotspot/src/share/vm/utilities/globalDefinitions.hpp

@@ -243,6 +243,36 @@ inline T byte_size_in_proper_unit(T s) {
   }
 }
 
+inline const char* exact_unit_for_byte_size(size_t s) {
+#ifdef _LP64
+  if (s >= G && (s % G) == 0) {
+    return "G";
+  }
+#endif
+  if (s >= M && (s % M) == 0) {
+    return "M";
+  }
+  if (s >= K && (s % K) == 0) {
+    return "K";
+  }
+  return "B";
+}
+
+inline size_t byte_size_in_exact_unit(size_t s) {
+#ifdef _LP64
+  if (s >= G && (s % G) == 0) {
+    return s / G;
+  }
+#endif
+  if (s >= M && (s % M) == 0) {
+    return s / M;
+  }
+  if (s >= K && (s % K) == 0) {
+    return s / K;
+  }
+  return s;
+}
+
 //----------------------------------------------------------------------------------------------------
 // VM type definitions
 

hotspot/src/share/vm/utilities/internalVMTests.cpp

@@ -50,7 +50,7 @@ void InternalVMTests::run() {
   run_unit_test(TestMetaspaceAux_test);
   run_unit_test(TestMetachunk_test);
   run_unit_test(TestVirtualSpaceNode_test);
-  run_unit_test(GlobalDefinitions_test);
+  run_unit_test(TestGlobalDefinitions_test);
   run_unit_test(GCTimer_test);
   run_unit_test(arrayOopDesc_test);
   run_unit_test(CollectedHeap_test);

hotspot/test/gc/g1/TestLargePageUseForAuxMemory.java

@@ -36,6 +36,8 @@
  */
 
 import java.lang.Math;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 
 import jdk.test.lib.*;
 import jdk.test.lib.Asserts;
@@ -47,14 +49,29 @@ public class TestLargePageUseForAuxMemory {
     static long smallPageSize;
     static long allocGranularity;
 
+    static void checkSize(OutputAnalyzer output, long expectedSize, String pattern) {
+        String pageSizeStr = output.firstMatch(pattern, 1);
+
+        if (pageSizeStr == null) {
+            output.reportDiagnosticSummary();
+            throw new RuntimeException("Match from '" + pattern + "' got 'null' expected: " + expectedSize);
+        }
+
+        long size = parseMemoryString(pageSizeStr);
+        if (size != expectedSize) {
+            output.reportDiagnosticSummary();
+            throw new RuntimeException("Match from '" + pattern + "' got " + size + " expected: " + expectedSize);
+        }
+    }
+
     static void checkSmallTables(OutputAnalyzer output, long expectedPageSize) throws Exception {
-        output.shouldContain("G1 'Block offset table': pg_sz=" + expectedPageSize);
+        checkSize(output, expectedPageSize, "Block Offset Table: .*page_size=([^ ]+)");
-        output.shouldContain("G1 'Card counts table': pg_sz=" + expectedPageSize);
+        checkSize(output, expectedPageSize, "Card Counts Table: .*page_size=([^ ]+)");
     }
 
     static void checkBitmaps(OutputAnalyzer output, long expectedPageSize) throws Exception {
-        output.shouldContain("G1 'Prev Bitmap': pg_sz=" + expectedPageSize);
+        checkSize(output, expectedPageSize, "Prev Bitmap: .*page_size=([^ ]+)");
-        output.shouldContain("G1 'Next Bitmap': pg_sz=" + expectedPageSize);
+        checkSize(output, expectedPageSize, "Next Bitmap: .*page_size=([^ ]+)");
     }
 
     static void testVM(String what, long heapsize, boolean cardsShouldUseLargePages, boolean bitmapShouldUseLargePages) throws Exception {
@@ -66,7 +83,7 @@ public class TestLargePageUseForAuxMemory {
                                                    "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,
                                                    "-Xms" + heapsize,
                                                    "-Xmx" + heapsize,
-                                                   "-XX:+TracePageSizes",
+                                                   "-Xlog:pagesize",
                                                    "-XX:+UseLargePages",
                                                    "-XX:+IgnoreUnrecognizedVMOptions",  // there is no ObjectAlignmentInBytes in 32 bit builds
                                                    "-XX:ObjectAlignmentInBytes=8",
@@ -82,7 +99,7 @@ public class TestLargePageUseForAuxMemory {
                                                    "-XX:G1HeapRegionSize=" + HEAP_REGION_SIZE,
                                                    "-Xms" + heapsize,
                                                    "-Xmx" + heapsize,
-                                                   "-XX:+TracePageSizes",
+                                                   "-Xlog:pagesize",
                                                    "-XX:-UseLargePages",
                                                    "-XX:+IgnoreUnrecognizedVMOptions",  // there is no ObjectAlignmentInBytes in 32 bit builds
                                                    "-XX:ObjectAlignmentInBytes=8",
@@ -108,11 +125,6 @@ public class TestLargePageUseForAuxMemory {
     }
 
     public static void main(String[] args) throws Exception {
-        if (!Platform.isDebugBuild()) {
-            System.out.println("Skip tests on non-debug builds because the required option TracePageSizes is a debug-only option.");
-            return;
-        }
-
         // Size that a single card covers.
         final int cardSize = 512;
         WhiteBox wb = WhiteBox.getWhiteBox();
@@ -159,4 +171,24 @@ public class TestLargePageUseForAuxMemory {
         testVM("case5: only bitmap uses large pages (extra slack)", heapSizeForBitmapUsingLargePages + heapSizeDiffForBitmap, false, true);
         testVM("case6: nothing uses large pages (barely not)", heapSizeForBitmapUsingLargePages - heapSizeDiffForBitmap, false, false);
     }
+
+    public static long parseMemoryString(String value) {
+        long multiplier = 1;
+
+        if (value.endsWith("B")) {
+            multiplier = 1;
+        } else if (value.endsWith("K")) {
+            multiplier = 1024;
+        } else if (value.endsWith("M")) {
+            multiplier = 1024 * 1024;
+        } else if (value.endsWith("G")) {
+            multiplier = 1024 * 1024 * 1024;
+        } else {
+            throw new IllegalArgumentException("Expected memory string '" + value + "'to end with either of: B, K, M, G");
+        }
+
+        long longValue = Long.parseUnsignedLong(value.substring(0, value.length() - 1));
+
+        return longValue * multiplier;
+    }
 }