changeset 49400:c382614abe59

8191924: Adjust DelegatingClassLoader's metadata space sizing algorithm Summary: Reduce memory usage for delegating class loader's metadata by adjusting sizing alogrithm Reviewed-by: adinn, stuefe, coleenp
author zgu
date Tue, 13 Mar 2018 16:21:45 -0400
parents 43a2159878d3
children 647ee5457fd1
files src/hotspot/share/memory/metaspace.cpp
diffstat 1 files changed, 7 insertions(+), 7 deletions(-) [+]
line wrap: on
line diff
--- a/src/hotspot/share/memory/metaspace.cpp	Wed Mar 14 14:09:33 2018 +0100
+++ b/src/hotspot/share/memory/metaspace.cpp	Tue Mar 13 16:21:45 2018 -0400
@@ -1248,9 +1248,9 @@
   // Maximum number of small chunks to allocate to a SpaceManager
   static uint const _small_chunk_limit;
 
-  // Maximum number of specialize chunks to allocate for anonymous
+  // Maximum number of specialize chunks to allocate for anonymous and delegating
   // metadata space to a SpaceManager
-  static uint const _anon_metadata_specialize_chunk_limit;
+  static uint const _anon_and_delegating_metadata_specialize_chunk_limit;
 
   // Sum of all space in allocated chunks
   size_t _allocated_blocks_words;
@@ -1418,7 +1418,7 @@
 };
 
 uint const SpaceManager::_small_chunk_limit = 4;
-uint const SpaceManager::_anon_metadata_specialize_chunk_limit = 4;
+uint const SpaceManager::_anon_and_delegating_metadata_specialize_chunk_limit = 4;
 
 const char* SpaceManager::_expand_lock_name =
   "SpaceManager chunk allocation lock";
@@ -3358,11 +3358,11 @@
   // Anonymous metadata space is usually small, with majority within 1K - 2K range and
   // rarely about 4K (64-bits JVM).
   // Instead of jumping to SmallChunk after initial chunk exhausted, keeping allocation
-  // from SpecializeChunk up to _anon_metadata_specialize_chunk_limit (4) reduces space waste
-  // from 60+% to around 30%.
-  if (_space_type == Metaspace::AnonymousMetaspaceType &&
+  // from SpecializeChunk up to _anon_or_delegating_metadata_specialize_chunk_limit (4)
+  // reduces space waste from 60+% to around 30%.
+  if ((_space_type == Metaspace::AnonymousMetaspaceType || _space_type == Metaspace::ReflectionMetaspaceType) &&
       _mdtype == Metaspace::NonClassType &&
-      sum_count_in_chunks_in_use(SpecializedIndex) < _anon_metadata_specialize_chunk_limit &&
+      sum_count_in_chunks_in_use(SpecializedIndex) < _anon_and_delegating_metadata_specialize_chunk_limit &&
       word_size + Metachunk::overhead() <= SpecializedChunk) {
     return SpecializedChunk;
   }