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comparison src/share/vm/runtime/arguments.cpp @ 1571:2d127394260e

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6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb Summary: Added new product ObjectAlignmentInBytes flag to control object alignment. Reviewed-by: twisti, ysr, iveresov
author kvn
date Thu, 27 May 2010 18:01:56 -0700
parents 2338d41fbd81
children e9ff18c4ace7
comparison
equal deleted inserted replaced
1570:de91a2f25c7e 1571:2d127394260e
1209 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1209 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1210 } 1210 }
1211 } 1211 }
1212 #endif // KERNEL 1212 #endif // KERNEL
1213 1213
1214 void set_object_alignment() {
1215 // Object alignment.
1216 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1217 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1218 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1219 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1220 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1221 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1222
1223 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1224 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1225
1226 // Oop encoding heap max
1227 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1228
1229 #ifndef KERNEL
1230 // Set CMS global values
1231 CompactibleFreeListSpace::set_cms_values();
1232 #endif // KERNEL
1233 }
1234
1235 bool verify_object_alignment() {
1236 // Object alignment.
1237 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1238 jio_fprintf(defaultStream::error_stream(),
1239 "error: ObjectAlignmentInBytes=%d must be power of 2", (int)ObjectAlignmentInBytes);
1240 return false;
1241 }
1242 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1243 jio_fprintf(defaultStream::error_stream(),
1244 "error: ObjectAlignmentInBytes=%d must be greater or equal %d", (int)ObjectAlignmentInBytes, BytesPerLong);
1245 return false;
1246 }
1247 return true;
1248 }
1249
1214 inline uintx max_heap_for_compressed_oops() { 1250 inline uintx max_heap_for_compressed_oops() {
1215 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1251 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1216 NOT_LP64(ShouldNotReachHere(); return 0); 1252 NOT_LP64(ShouldNotReachHere(); return 0);
1217 } 1253 }
1218 1254
1219 bool Arguments::should_auto_select_low_pause_collector() { 1255 bool Arguments::should_auto_select_low_pause_collector() {
1220 if (UseAutoGCSelectPolicy && 1256 if (UseAutoGCSelectPolicy &&
1773 1809
1774 // Limit the lower bound of this flag to 1 as it is used in a division 1810 // Limit the lower bound of this flag to 1 as it is used in a division
1775 // expression. 1811 // expression.
1776 status = status && verify_interval(TLABWasteTargetPercent, 1812 status = status && verify_interval(TLABWasteTargetPercent,
1777 1, 100, "TLABWasteTargetPercent"); 1813 1, 100, "TLABWasteTargetPercent");
1814
1815 status = status && verify_object_alignment();
1778 1816
1779 return status; 1817 return status;
1780 } 1818 }
1781 1819
1782 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1820 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2846 2884
2847 #if defined(_LP64) && defined(COMPILER1) 2885 #if defined(_LP64) && defined(COMPILER1)
2848 UseCompressedOops = false; 2886 UseCompressedOops = false;
2849 #endif 2887 #endif
2850 2888
2889 // Set object alignment values.
2890 set_object_alignment();
2891
2851 #ifdef SERIALGC 2892 #ifdef SERIALGC
2852 force_serial_gc(); 2893 force_serial_gc();
2853 #endif // SERIALGC 2894 #endif // SERIALGC
2854 #ifdef KERNEL 2895 #ifdef KERNEL
2855 no_shared_spaces(); 2896 no_shared_spaces();