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8276662: Scalability bottleneck in SymbolTable::lookup_common()

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Reviewed-by: redestad, dholmes, iklam, shade
This commit is contained in:
Derek White 2021-11-20 00:48:32 +00:00
parent c79a485f1c
commit 1d7cef33c5
1 changed files with 7 additions and 0 deletions
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7
src/hotspot/share/classfile/symbolTable.cpp
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@ -91,7 +91,14 @@ static volatile bool _has_items_to_clean = false;
static volatile bool _alt_hash = false; static volatile bool _alt_hash = false;
#ifdef USE_LIBRARY_BASED_TLS_ONLY
static volatile bool _lookup_shared_first = false; static volatile bool _lookup_shared_first = false;
#else
// "_lookup_shared_first" can get highly contended with many cores if multiple threads
// are updating "lookup success history" in a global shared variable. If built-in TLS is available, use it.
static THREAD_LOCAL bool _lookup_shared_first = false;
#endif
// Static arena for symbols that are not deallocated // Static arena for symbols that are not deallocated
Arena* SymbolTable::_arena = NULL; Arena* SymbolTable::_arena = NULL;