changeset 4074:44c5fcd9cb25

8006280: Need to reorder metadata structures to reduce size (64-bit) Summary: Reordered Klass, InstanceKlass and Method to save 8 bytes each Reviewed-by: coleenp, jiangli Contributed-by: ioi.lam@oracle.com
author iklam
date Thu, 24 Jan 2013 10:57:38 -0800
parents 6cf2530f7fd3
children 1eae78177059
files src/share/vm/oops/instanceKlass.hpp src/share/vm/oops/klass.hpp src/share/vm/oops/method.hpp
diffstat 3 files changed, 19 insertions(+), 18 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/oops/instanceKlass.hpp	Thu Jan 24 23:30:45 2013 -0800
+++ b/src/share/vm/oops/instanceKlass.hpp	Thu Jan 24 10:57:38 2013 -0800
@@ -256,6 +256,16 @@
   // JVMTI fields can be moved to their own structure - see 6315920
   unsigned char * _cached_class_file_bytes;       // JVMTI: cached class file, before retransformable agent modified it in CFLH
   jint            _cached_class_file_len;         // JVMTI: length of above
+
+  volatile u2     _idnum_allocated_count;         // JNI/JVMTI: increments with the addition of methods, old ids don't change
+
+  // Class states are defined as ClassState (see above).
+  // Place the _init_state here to utilize the unused 2-byte after
+  // _idnum_allocated_count.
+  u1              _init_state;                    // state of class
+  u1              _reference_type;                // reference type
+
+
   JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map;  // JVMTI: used during heap iteration
 
   // Method array.
@@ -281,15 +291,6 @@
   //     ...
   Array<u2>*      _fields;
 
-  volatile u2     _idnum_allocated_count;         // JNI/JVMTI: increments with the addition of methods, old ids don't change
-
-  // Class states are defined as ClassState (see above).
-  // Place the _init_state here to utilize the unused 2-byte after
-  // _idnum_allocated_count.
-  u1              _init_state;                    // state of class
-
-  u1              _reference_type;                // reference type
-
   // embedded Java vtable follows here
   // embedded Java itables follows here
   // embedded static fields follows here
--- a/src/share/vm/oops/klass.hpp	Thu Jan 24 23:30:45 2013 -0800
+++ b/src/share/vm/oops/klass.hpp	Thu Jan 24 10:57:38 2013 -0800
@@ -75,11 +75,11 @@
 //    [class_loader_data]
 //    [modifier_flags]
 //    [access_flags  ]
-//    [verify_count  ] - not in product
-//    [alloc_count   ]
 //    [last_biased_lock_bulk_revocation_time] (64 bits)
 //    [prototype_header]
 //    [biased_lock_revocation_count]
+//    [verify_count  ] - not in product
+//    [alloc_count   ]
 //    [_modified_oops]
 //    [_accumulated_modified_oops]
 //    [trace_id]
@@ -164,18 +164,18 @@
   jint        _modifier_flags;  // Processed access flags, for use by Class.getModifiers.
   AccessFlags _access_flags;    // Access flags. The class/interface distinction is stored here.
 
+  // Biased locking implementation and statistics
+  // (the 64-bit chunk goes first, to avoid some fragmentation)
+  jlong    _last_biased_lock_bulk_revocation_time;
+  markOop  _prototype_header;   // Used when biased locking is both enabled and disabled for this type
+  jint     _biased_lock_revocation_count;
+
 #ifndef PRODUCT
   int           _verify_count;  // to avoid redundant verifies
 #endif
 
   juint    _alloc_count;        // allocation profiling support
 
-  // Biased locking implementation and statistics
-  // (the 64-bit chunk goes first, to avoid some fragmentation)
-  jlong    _last_biased_lock_bulk_revocation_time;
-  markOop  _prototype_header;   // Used when biased locking is both enabled and disabled for this type
-  jint     _biased_lock_revocation_count;
-
   TRACE_DEFINE_KLASS_TRACE_ID;
 
   // Remembered sets support for the oops in the klasses.
--- a/src/share/vm/oops/method.hpp	Thu Jan 24 23:30:45 2013 -0800
+++ b/src/share/vm/oops/method.hpp	Thu Jan 24 10:57:38 2013 -0800
@@ -127,8 +127,8 @@
   InvocationCounter _backedge_counter;           // Incremented before each backedge taken - used to trigger frequencey-based optimizations
 
 #ifdef TIERED
+  float             _rate;                        // Events (invocation and backedge counter increments) per millisecond
   jlong             _prev_time;                   // Previous time the rate was acquired
-  float             _rate;                        // Events (invocation and backedge counter increments) per millisecond
 #endif
 
 #ifndef PRODUCT