6821700: tune VM flags for peak performance

Summary: Tune C2 flags default values for performance.
Reviewed-by: never, phh, iveresov, jmasa, ysr

src/cpu/sparc/vm/globals_sparc.hpp

@@ -46,6 +46,7 @@ define_pd_global(uintx, TLABSize,              0);
 define_pd_global(uintx, NewSize, ScaleForWordSize((2048 * K) + (2 * (64 * K))));
 define_pd_global(intx,  SurvivorRatio,         8);
 define_pd_global(intx,  InlineFrequencyCount,  50);  // we can use more inlining on the SPARC
+define_pd_global(intx,  InlineSmallCode,       1500);
 #ifdef _LP64
 // Stack slots are 2X larger in LP64 than in the 32 bit VM.
 define_pd_global(intx,  ThreadStackSize,       1024);

src/cpu/sparc/vm/vm_version_sparc.cpp

@@ -62,7 +62,7 @@ void VM_Version::initialize() {
   if (is_niagara1()) {
     // Indirect branch is the same cost as direct
     if (FLAG_IS_DEFAULT(UseInlineCaches)) {
-      UseInlineCaches         = false;
+      FLAG_SET_DEFAULT(UseInlineCaches, false);
     }
 #ifdef _LP64
     // Single issue niagara1 is slower for CompressedOops
@@ -79,15 +79,19 @@ void VM_Version::initialize() {
 #ifdef COMPILER2
     // Indirect branch is the same cost as direct
     if (FLAG_IS_DEFAULT(UseJumpTables)) {
-      UseJumpTables           = true;
+      FLAG_SET_DEFAULT(UseJumpTables, true);
     }
     // Single-issue, so entry and loop tops are
     // aligned on a single instruction boundary
     if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
-      InteriorEntryAlignment  = 4;
+      FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
     }
     if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
-      OptoLoopAlignment       = 4;
+      FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
+    }
+    if (is_niagara1_plus() && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
+      // Use smaller prefetch distance on N2
+      FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
     }
 #endif
   }
@@ -95,7 +99,7 @@ void VM_Version::initialize() {
   // Use hardware population count instruction if available.
   if (has_hardware_popc()) {
     if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
-      UsePopCountInstruction = true;
+      FLAG_SET_DEFAULT(UsePopCountInstruction, true);
     }
   }
 

src/cpu/x86/vm/globals_x86.hpp

@@ -60,6 +60,7 @@ define_pd_global(uintx, NewSize,                  1024 * K);
 define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));
 #endif // AMD64
 define_pd_global(intx,  InlineFrequencyCount,     100);
+define_pd_global(intx,  InlineSmallCode,          1000);
 define_pd_global(intx,  PreInflateSpin,           10);
 
 define_pd_global(intx, StackYellowPages, 2);

src/share/vm/classfile/vmSymbols.hpp

@@ -50,6 +50,7 @@
   template(java_lang_Class,                           "java/lang/Class")                          \
   template(java_lang_String,                          "java/lang/String")                         \
   template(java_lang_StringValue,                     "java/lang/StringValue")                    \
+  template(java_lang_StringCache,                     "java/lang/StringValue$StringCache")        \
   template(java_lang_Thread,                          "java/lang/Thread")                         \
   template(java_lang_ThreadGroup,                     "java/lang/ThreadGroup")                    \
   template(java_lang_Cloneable,                       "java/lang/Cloneable")                      \
@@ -286,6 +287,7 @@
   template(frontCacheEnabled_name,                    "frontCacheEnabled")                        \
   template(stringCacheEnabled_name,                   "stringCacheEnabled")                       \
   template(bitCount_name,                             "bitCount")                                 \
+  template(profile_name,                              "profile")                                  \
                                                                                                   \
   /* non-intrinsic name/signature pairs: */                                                       \
   template(register_method_name,                      "register")                                 \

src/share/vm/opto/bytecodeInfo.cpp

@@ -232,6 +232,14 @@ const char* InlineTree::shouldNotInline(ciMethod *callee_method, ciMethod* calle
     return "disallowed by CompilerOracle";
   }
 
+  if (UseStringCache) {
+    // Do not inline StringCache::profile() method used only at the beginning.
+    if (callee_method->name() == ciSymbol::profile_name() &&
+        callee_method->holder()->name() == ciSymbol::java_lang_StringCache()) {
+      return "profiling method";
+    }
+  }
+
   return NULL;
 }
 

src/share/vm/runtime/globals.hpp

@@ -47,6 +47,7 @@ define_pd_global(intx, Tier4BackEdgeThreshold,       0);
 define_pd_global(intx, OnStackReplacePercentage,     0);
 define_pd_global(bool, ResizeTLAB,                   false);
 define_pd_global(intx, FreqInlineSize,               0);
+define_pd_global(intx, InlineSmallCode,              0);
 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 define_pd_global(intx, NewRatio,                     4);
 define_pd_global(intx, InlineClassNatives,           true);
@@ -2616,7 +2617,7 @@ class CommandLineFlags {
   develop(intx, MaxRecursiveInlineLevel, 1,                                 \
           "maximum number of nested recursive calls that are inlined")      \
                                                                             \
-  product(intx, InlineSmallCode, 1000,                                      \
+  product_pd(intx, InlineSmallCode,                                         \
           "Only inline already compiled methods if their code size is "     \
           "less than this")                                                 \
                                                                             \