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8191924: Adjust DelegatingClassLoader's metadata space sizing algorithm

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Reduce memory usage for delegating class loader's metadata by adjusting sizing alogrithm

Reviewed-by: adinn, stuefe, coleenp
This commit is contained in:
Zhengyu Gu 2018-03-13 16:21:45 -04:00
parent 697538d0a9
commit 96813b1885
1 changed files with 7 additions and 7 deletions
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14
src/hotspot/share/memory/metaspace.cpp
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@ -1248,9 +1248,9 @@ class SpaceManager : public CHeapObj<mtClass> {
// 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 @@ class SpaceManager : public CHeapObj<mtClass> {
};
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 @@ size_t SpaceManager::calc_chunk_size(size_t word_size) {
// 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;
}