OpenJDK / jdk / hs
changeset 49231: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(-) [+] |
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--- 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; }